SECTION 2
MATERIALS AND
WORKMANSHIP
Job No
Section 2
Materials and Workmanship
BUILDING SURVEYORS PREAMBLES
CONTENTS PAGE
1.
GENERAL
2.
DEMOLITION AND ALTERATION
3.
EXCAVATION AND EARTHWORK
4.
CONCRETE WORK
5.
BRICKWORK AND BLOCKWORK
6.
MASONRY
7.
ROOFING/WALL CLADDING
8.
WOODWORK
9.
STRUCTURAL STEELWORK
10.
METALWORK
11.
PLUMBING AND ENGINEERING INSTALLATIONS
12.
ELECTRICAL INSTALLATIONS
13.
FLOOR WALL AND CEILING FINISHINGS
14.
PAINTING AND DECORATING
15.
SCAFFOLD
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 2
Job No
Section 2
Materials and Workmanship
PART NR. 2
GENERAL DESCRIPTIONS OF MATERIALS AND WORKMANSHIP
1.
GENERAL
1.1.
Generally
1.1.1.
Application of descriptions
Descriptions of materials and workmanship apply through this specification. The clauses
given under each work section heading in these preambles shall unless otherwise indicated
apply equally to other Work Sections involving similar work. The Contractor’s attention is
drawn to the fact that no reference to these descriptions of materials and workmanship is
made in the measured work. Descriptions contained in the Works’ part of this Specification
shall take precedence over those contained in these preambles where there is a divergence
1.1.2.
Standard and Codes
A reference to a BS or CP shall be deemed to be the latest published edition of such BS or CP
inclusive of all amendments and addenda
All work shall be carried out in accordance with the Building Regulations Current Edition
1.1.3.
Materials
Materials unless otherwise described shall comply with the appropriate BS or where none is
applicable shall be of the highest quality suitable for the purpose of the works stated or to be
reasonably inferred from the contract documents
For products and materials specified to British Standards a Certificate of Compliance from
manufacturers shall be obtained when requested by the CA
1.1.4.
Workmanship
Workmanship throughout shall be in accordance with good building practice and comply with
BS8000 and any relevant parts of any other CP and BS referred to herein
Where proprietary materials are quoted they shall unless otherwise stated be fixed
incorporated or applied in strict accordance with any instructions printed or issued by the
manufacturers
1.1.5.
Alternative products or services
Where reference is made in the Specification to named products or to work to be performed or
materials to be supplied by specific firms the Contract may, where an equivalent product or
services is available, submit the names of alternative products, firms, or suppliers to the CA for
consideration
1.1.6.
Measurement of materials required to be lapped or seamed or welted
No allowance has been made in the measurement for laps seams or welts and allowance shall
be made in the rates for all such laps seams or welts etc., required by manufacturers
instructions/guidance notes and good building practice
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Page No. 3
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Section 2
Materials and Workmanship
1.1.7.
Approvals
Where work is specified to be to the approval of the CA then the same shall be executed to
comply with all relevant requirements and stated or implied characteristics either to the
express approval of the CA or to match a sample expressly approved by the CA
Where reference is made in the contract documents to approval of samples of finished work by
the CA, the Contractor shall provide such samples as required. The appropriate work shall not
proceed until approval has been obtained. Approved samples shall be retained on site for
comparison with the Works and shall be removed when no longer required.
Inspection of other action by the CA must not be taken as approval of materials products or
work unless the CA so confirms in writing in express terms referring to:a. Date of inspection
b. Part of the work inspected
c.
Respects of characteristics
d. Extent and purpose of the approval
e. Any associated conditions
1.1.8.
Disposal of materials off site
Disposal of materials off site shall be deemed to include for all costs associated with land fill
tax
1.1.9.
Water
Water shall be clean and free from harmful matter. If required by the CA it shall be tested in
accordance with BS EN 1008
1.1.10.
Burning on site
Burning on site of materials etc., arising from the demolitions and alterations will not be
permitted
1.2.
Fixing
1.2.1.
Generally
Use fixing and jointing methods and types and spacing of fastenings which are suitable having
regard to:
1.
Nature of and compatibility with product/materials
2.
Recommendations of manufacturer of fastenings, and manufacturers of
product/material being fixed and fixed to
3.
Materials and loads to be supported
4.
Conditions expected in use
5.
Appearance, this being subject to approval
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Page No. 4
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Section 2
Materials and Workmanship
1.2.2.
Fixing timber
Timber shall be deemed to be fixed with nails unless otherwise stated
Nails used in external construction shall be corrosion resistant
1.2.3.
Plugging
The term plugging means the provision and fixing of approved proprietary plugs or where at
the contractors discretion fixing by approved mechanical means
1.2.4.
Fixing with screws
Fixing with screws shall be deemed to include for drilling the material being fixed and for
countersinking and drilling pilot holes where necessary. Where brass, aluminium or other soft
metal screws are used pre-cut the thread with a matching steel screw
Screws used in external construction shall be corrosion resistant
1.2.5.
Fixings to plasterboard
Lightweight fixings to laminated plasterboard partitions and plasterboard dry linings where
described as “fixed or screwed to laminated plasterboard” or “fixed to or plugged and screwed
through plasterboard dry linings” shall include for all necessary proprietary fixing plugs and
spacers etc.
1.2.6.
Cartridge operated fixing tools
Cartridge operated fixing tools shall be operated in accordance with BS4078 and the
recommendations detailing use and maintenance of such tools contained in Appendix A shall
be considered as mandatory, the tools shall not be operated unless fitted with a suitable
splinter guard. The use of these tools shall be controlled so as to avoid the risk of injury loss
of life or damage to property and operatives to be trained and certified as competent by the
tool manufacturer
Cartridges shall be clearly marked with the strength of the charge and only those
corresponding to specifications issued by the manufacturer of the tools shall be used.
Cartridges shall be kept in a dry secure store and strict control maintained on their issue. A
count shall be made at the end of each working day of spent and unspent cartridges which
shall tally with the number issued. The number of cartridges brought onto the site and the
number left on completion shall be taken and a balance struck. All spent and unspent
cartridges shall be removed from site on completion
Cartridge operated fixing tools shall not be allowed unless approval is given in writing by the
CA
1.3.
Site Waste Management Plans
1.3.1.
Generally
Refer to the Code of Practice for Site Waste Plans published by the Department of Trade and
Industry
Formulate a Site Waste Management Plan prior to the commencement of any work and keep
up to date
As far as possible keep waste to a minimum and recycle waste if possible
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
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Section 2
Materials and Workmanship
2.
DEMOLITION AND ALTERATION
2.1.
Generally
Materials and workmanship unless otherwise stated shall be in accordance with all relevant
clauses of the appropriate sections of these general descriptions of materials and
workmanship.
Code of Practice
The requirements of the following shall apply where relevant
BS 6187
2.2.
Workmanship
2.2.1.
Term “grubbing up”
- Demolition
The term grubbing up shall be deemed to include for breaking up or taking out the various
items by whatever means necessary
2.2.2.
Term “disconnecting and removing electric fittings and wiring”
The term “disconnecting and removing water and heating services” shall be deemed to include
the removal of all associated fixings and making good where pipes and fixings have been
removed
2.2.3.
Terms “making good” and “making out”
The terms “making good” and “making out” shall be interpreted in their fullest sense and shall
include for reinstating the fabric or finishing up to new work wherever disturbed or dislocated
and for making out as required in materials to match existing. The Contractor shall use every
care in carrying out the Works not to interfere with the existing work more than is absolutely
necessary
2.3.
Pricing Instructions
2.3.1.
Pricing on site
The Contractor shall be deemed to have visited the site and ascertained the full nature and
extent of the demolitions and alterations
2.3.2.
Credits
A credit shall be allowed for all old materials (excepting materials described as removed to
store or set aside for re-use) which shall become the property of the Contractor. The credits
shall be priced in the general summary and the Contractor shall provide a detailed list of the
items he has given a credit for. The Employer reserves the right to retain any of the old
materials at the prices allowed in the credit column
2.3.3
Dust
Prices for demolition work shall include for taking all necessary measures/precautions to
reduce the amount of dust to an acceptable level
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Materials and Workmanship
2.3.4
Articles and materials removed to store or set aside for re-use
Prices for articles and materials described as removed to store or set aside for re-use shall
unless otherwise described include for the provision of the necessary storage accommodation
(on or off site and protection)
Prices for articles and materials described as refixed shall include for properly examining,
overhauling, repairing or making good as required and for replacing any broken items with
new to match existing
2.3.5
Cutting off services
Prices for cutting off services shall include for allowing full facilities to, and making all
arrangements with, appropriate Authorities, Boards, Companies for the like for removal of
fixtures, fittings or services belonging thereto affected by the Works and paying all charges in
connection therewith. The Contractor shall satisfy himself that all Electricity, Gas, Water and
all other services are disconnected prior to the commencement of the Works and he will be
held responsible for any injury or damage to persons or property by his failure so to do
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
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Materials and Workmanship
3.
EXCAVATION AND EARTHWORK
3.1.
Generally
3.1.1.
Codes of Practice
Unless otherwise described the requirements of the following shall apply where relevant
3.1.2.
BS 5837-
Trees in relation to construction
BS 5930/
BS EN ISO 14688-2-
Site investigations
BS 6031-
Earthworks
BS 8004-
Foundations
BS 8103-1-
Structural design of low rise buildings – for stability, site
investigations, foundations and ground floor slabs for
housing
Formation level
The formation level referred to in the descriptions of excavations is the level after excavation to
remove top solid and to reduce levels
3.1.3.
Term excavated material
The term excavated material shall mean material arising from the excavations other than top
soil
3.1.4.
Term spoil
The term spoil shall mean any material arising from the excavations
3.1.5.
Landscaping (excluding hard surfaces)
The recommendations for landscape operations contained in BS 4428 shall be followed where
relevant
3.2.
Materials
3.2.1.
Excavated material filling
Excavated material used for filling shall be free from roots vegetable matter rubbish frozen
solid and other deleterious matter. Lumps and clods shall be broken up before use. Water
shall only be added if the CA so directs. Where described as selected the excavated material
used for filling shall in addition be especially selected as most suitable for the particular
purpose
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Materials and Workmanship
3.2.2.
Hardcore filling
Hardcore filling shall be hard stone, coarse gravel, hard bricks or other approved hard material
free from dust gypsum or other deleterious matter broken to suitable sizes for the particular
work or as directed by the CA and well graded
Hardcore from the demolitions may be used if broken to suitable sizes and approved by the CA
3.2.3.
Blinding
Blinding to hardcore shall be sand to BS EM 12620
3.2.4.
Geotextile sub-base membranes
Geotextile membranes shall comply with BS EN 13249
3.3.
Workmanship
3.3.1.
Excavations
The Contractor is forbidden to make any excavations other than those necessary for the
various works in building
Trench bottoms and other excavations are to be inspected and approved by the CA before any
concrete is deposited
In the event of the Contractor excavating below the required levels he shall fill up the part so
excavated with lean mix concrete or an approved granular material as directed by the CA at his
own expense
3.3.2.
Trenches for service pipes cables and the like
The width of all trenches up to the crown of the pipe etc. shall be no wider than is necessary
to permit the proper jointing of the pipes etc., laid in the trench subject to a minimum
clearance of 150mm between the outside of such pipe etc., and the face of the excavation of
trench supports
3.3.3.
Removing spoil
All spoil removed from the site shall be deposited at a Licensed Tip or other approved site and
the Contractor shall provide proof if requested that an approved tip/site has been used
3.3.4.
Compaction of fillings
Compaction of fillings shall unless otherwise stated by mechanical compacting plant of suitable
type and weight to thoroughly compact the filling material giving a smooth and even surface
and ensuring that all voids are filled. Screenings of the particular filling material shall be added
where necessary to even out local imperfections of level and fill surface voids
3.3.5.
Tree Work
Cutting, pruning, thinning and the like, protection, repair work and removal shall comply with
the recommendations of BS 3998
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Materials and Workmanship
3.4.
Pricing Instructions
3.4.1.
Measurement of excavations
Prices of excavation shall include for excavating in any type of ground (excluding rock which is
of such size or position that it can only be removed by means of wedges, specialist plant or
explosives) including loose or compacted hardcore rubble debris and the like. Breaking up
such obstructions as mass concrete brickwork and similar hard substances has been measured
Prices of all excavation shall include for working around and between all services and other
obstructions encountered where no specific precautions are required
3.4.2.
Breaking up
Prices for all items of breaking up concrete, brickwork etc. shall include for removing from site
3.4.3.
Filling etc.
Prices for all filling shall unless otherwise described included for depositing and compacting in
finished layers not exceeding 150mm in thickness
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
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Materials and Workmanship
4.
CONCRETE WORK
4.1.
Generally
4.1.1.
Codes of Practice
4.1.2.
The requirements of the following shall apply where relevant
4.1.3.
BS 8110-1
Structural use of concrete – design and construction
4.1.4.
BS 5395-1
Concrete stairs
4.1.5.
BS 7533-6
Laying precast concrete kerbs, channels, edgings and
quadrants
4.1.6.
BS 8103-1
Structural design for low rise buildings – foundations and
ground floor slabs for houses
4.1.7.
BS 8103-4
Structural design for low rise buildings, suspended concrete
floors for housing
4.1.8.
BS 8221
Cleaning and surface repair of buildings
4.1.9.
Supervision
The supervision employed shall be such as to ensure the required standard of control over
materials and workmanship. The CA shall be afforded all reasonable opportunity and facility to
inspect the materials and manufacture of the concrete and to take any samples or make any
tests. All such inspection, sampling and testing to be carried out with minimum of interference
with the process of manufacture and delivery
4.1.10.
Method of Measurement
The surface leaning and repair of concrete has been measured in accordance with current
edition of the Standard Method of Measurement for Concrete Repair published by the Concrete
Repair Association
4.2.
Materials
4.2.1.
Cement
All cement shall be supplied by manufacturers who are B.S.I registered firms of assessed
capability. Cement Test Certificates bearing the manufacturers certificate number shall if
required be made available to the CA
Common Portland cement shall comply with BS EN 197-1 Type CEM1
Sulphate resisting Portland cement shall comply with BS 4027
4.2.2.
Aggregates
Aggregates shall be natural unless otherwise stated
Coarse aggregate shall comply with BS EN 12620 Tables 2 and 3
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Materials and Workmanship
Fine aggregate shall comply with BS EN 12620 Table 4
All in aggregate shall comply with BS EN 12620 Table 6
4.2.3.
Lightweight aggregates
Lightweight aggregate shall comply with BS EN 13055-1
4.2.4.
Reinforcement
Plain bar reinforcement shall comply with BS 4482
Ribbed bar reinforcement shall comply with BS 4449
Steel dowel bars shall comply with BS EN 13877-3
Galvanizing of steel reinforcement shall comply with BS EN ISO 1461
Spacers and chairs shall comply with BS 7973
Tying wire for use with reinforcement shall be 2mm (16 swg) annealed steel wire
4.2.5.
Concrete admixtures
Concrete admixtures shall comply with BS EN 934-2 and 3
4.2.6.
Mastics and sealants
Two part polysulphide based sealants shall comply with BS 4254
One part gun grade polysulphide based sealants shall comply with BS 5215
4.2.7.
Concrete grades/mixes
Concrete grades and mixes shall comply with the relevant clauses of BS EN 206-1/BS 8500-1
and 2
The type of cement to be used for all concrete shall be common Portland Cement unless
otherwise specified
No admixtures shall be used unless prior approval has been given by the CA
4.2.8.
Ready mixed concrete
Ready mixed concrete shall be supplied from depots approved under the Authorisation Scheme
of the Ready Mixed Concrete Association or from other plants providing an equivalent standard
of quality
Ready mixed concrete shall comply with BS EN 206-1 and BS 8500-1 and 2
The ready mixed concrete supplier shall provide adequate samples of each concrete proposed
for use on the site before it is required for placing so that the Contractor may carry out any
workability tests required
4.2.9.
Lintels
Prefabricated precast concrete lintels shall comply with BS EN 854-2
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Materials and Workmanship
4.3.
Workmanship
4.3.1.
Storage of materials
Aggregates shall be separately stored and maintained in a clean condition with adequate
drainage facilities
Cement shall be stored and maintained under dry conditions. Each consignment and different
grade shall be separately stored to facilitate inspection and testing as may be required or
directed
4.3.2.
Mixing Concrete
The quantities of cement and fine and coarse aggregates shall be measured by weight
No concrete which has become stale or commenced to set shall be worked up and
incorporated in a fresh batch or used in the work
4.3.3.
Placing concrete
All reinforced concrete is to be compacted by a mechanical vibrator
Where concrete is to be compacted by mechanical vibration the type of vibrator proposed shall
be agreed with the CA and the method of use shall suit the particular section of work being
cast
4.3.4.
Precast concrete
Reinforced precast concrete members shall be marked “TOP” on the appropriate face to ensure
correct bedding position
Precast members described as “smooth face” shall have a perfectly smooth surface free from
pits or fins etc., otherwise the members shall be cast with a suitable surface to provide an
adequate key for plastering etc.
4.3.5.
Inspection and testing
Before any concreting or stripping of formwork is begun adequate notice must be given to the
CA
The Contractor shall before concrete work commences and from time to time or as directed by
the CA during the progress of the work provide concrete for use in slump or compacting fact
tests, cubes for making compression tests or beams for making flexure tests etc.
The Contractor shall send the specimen cubes and beams to a suitable laboratory for testing as
directed and shall pay all charges in connection with same
The taking of, and methods of testing shall comply with BS EN 12390 and reports of all tests
shall be submitted to the CA
In the event of concrete not complying with requirements action (which may range from
qualified acceptance to rejection and removal) shall be taken as directed by the CA
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Materials and Workmanship
4.4.
Pricing Instructions
4.4.1.
Surface finish to beds and slabs
Prices of in-situ beds and slabs shall include for a tamped surface finish unless otherwise
described
4.4.2.
Reinforcement
Prices for fabric reinforcement shall include for side laps end laps
4.4.3.
Channels, chases, mortices, pockets, holes and the like
4.5.
Prices of channels, chases, mortices, pockets, holes and the like shall include for making good
as required
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
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Materials and Workmanship
5.
BRICKWORK AND BLOCKWORK
5.1.
Generally
5.1.1.
Code of practice
The requirements of the following shall apply where relevant
BS EN 1052-1:2005
BS EN 1052-1:1999
Structural use of masonry
BS 6093:2006
Design of joints and jointing in building construction
BS 5854
Flues and flue structures in buildings
BS 6576:2005
Installation of chemical damp proof courses
BS 8103-2
Structural design of low rise buildings, masonry walls for
housing
BS 8215:1991
Installation of damp proof courses in masonry
construction
BS 8221-1 and 2
Cleaning and surface repair of buildings
5.2.
Materials
5.2.1.
Bricks generally
Bricks unless otherwise stated described shall be 215 x 102 x 65mm to BS 4729 CB.1.5.
Shapes and sizes of standard special bricks shall unless otherwise described comply with BS
4729:2005.
5.2.2.
Clay bricks
Clay bricks unless otherwise described shall comply with BS EN 771-1
Modular clay bricks shall comply with BS EN 771-1
Bricks delivered warm from the manufacturing process: do not use until cold
Absorbent bricks in warm weather: wet to reduce suction. Do not soak
5.2.3.
Calcium silicate bricks
Calcium silicate bricks shall comply with BS EN 771-2
Modular calcium silicate bricks shall comply with BS 6649/BS EN 771-2
5.2.4.
Freeze/thaw resistance of bricks
Clay bricks subject to sever exposure shall comply with BS EN 771-1 durability designation F2
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Materials and Workmanship
The Contractor is required to produce for the CA before bricklaying commences a current test
certificate from the brickworks brick supplier confirming that the bricks chosen comply with the
durability designation of BS EN 771-1. Trade literature will not be considered proof.
5.2.5.
Building Blocks
Aggregate concrete masonry units (dense and lightweight aggregate) shall comply with BS EN
771-4
Autoclaved aerated masonry units shall comply with BS EN 771 Part 4/BS EN 772-2
Autoclaved concrete Blocks delivered warm from the manufacturing process: do not use until
cold
Non Autoclaved concrete Blocks do not use until at least four week old
Absorbent bricks in warm weather: wet to reduce suction. Do not wet – use water retaining
mortar admixture: submit details
Blocks shall be obtained from one of the members of the Federation of Building Block
Manufactures
5.2.6.
Cement
All cement shall be supplied by manufacturers who are B.S.I registered firms of assessed
capability. Cement test certificates bearing the manufacturers certificate number shall if
required to be made available to the CA.
Common Portland cement shall comply with BS EN 197-1:2000 Type CEM 1
Sulphate resisting Portland cement shall comply with BS 4027:1996
Masonry cement shall comply with BS EN 413-1:2004
5.2.7.
Aggregate (sand)
Aggregate (sand) for mortar shall comply with BS EN 13139:2002 Category 3
5.2.8.
Mortar plasticiser
Mortar plasticiser shall comply with BS 4887-1
5.2.9.
Mortar mixes
Mortar designations shall comply with Table A.1 of BS 5628-3
Cement shall be ordinary Portland unless otherwise described
Cement mortar 1:3 Mortar Designation (i)
Cement lime mortar (1 : ½ :4 to 4 ½) Mortar Designation (ii)
Cement lime mortar (1:1:5 to 6) Mortar Designation (iii)
Cement lime mortar (1:2:8 to 9) Mortar Designation (iv)
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Materials and Workmanship
Plasticised cement mortar (1:5 to 6) Mortar Designation (iii)
Masonry cement mortar (1:4 to 5) Mortar Designation (iii)
Coloured cement lime mortar (1:1:6) shall be composed of one part of cement to seven parts
of ready mixed pigmented lime/sand
5.2.10.
Damp-proof courses
Bitumen damp-proof courses shall comply with BS 6398:1983 Table 1
Polyethylene damp-proof courses shall comply with BS 6515
5.2.11.
Cavity Closers
Insulated Cavity Closers installed in accordance with manufactures instructions.
5.2.12.
Wall tiles
Wall ties are to be stainless steel (Austenitic stainless steel 18/8 composition) to BS 1243: 1978
table 3 and arte to be obtained from an approved manufacturer, sanctioned by the architect
Special ties are to be manufactured by an approved manufacturer, sanctioned by the architect
unless noted otherwise and are to be provided in the lpo0cations indicated upon the working
drawing
5.2.13.
Mastic Sealants
Two part polysulphide based sealants shall comply with BS 4254:1983.
5.2.14.
Materials for thermal insulation of cavity walls
Cavity insulation shall be installed within the cavities of walling, as indicated upon the working
drawings, strictly in accordance with the manufacturers recommendations and instructions,
including any additional fixings that may be required, together with all necessary cutting and
fitting, etc.
5.2.15.
Components for masonry
Ties, straps, hangers and brackets shall comply with BS EN 845-1:2003
Prefabricated lintels shall comply with BS EN 845-2:2003
Bed joint reinforcement shall comply with BS EN 845-3:2003
5.3.
Workmanship
5.3.1.
Storage and protection of materials
Sands shall be stored separately and maintained in a clean condition
Cement and lime shall be stored and maintained under dry conditions. Each consignment and
different grade shall be stored separately so as to permit inspection and shall be used in order
of delivery
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Materials and Workmanship
Bricks and blocks shall be stacked separately according to type and strength and protected
from rain
5.3.2.
Laying bricks
The laying of bricks and blockwork shall comply with BS 5628 Part 1: 1975 and Parts 2 and 3:
19855 and BS 5606: 1978
Brickwork shall be carried up in even heights and four courses of finished work are to rise
300mm in height. Each course shall be well flushed up in mortar and vertical and cross joints
filled in solidly
Blockwork shall be carried up in even heights and four courses of finished work are to rise
900mm in height. Each course shall be well flushed up in mortar and vertical and cross joints
filled in solidly
No broken bricks/blocks or bats shall be used except where legitimately required to obtain
bond.
Minimum cut block size shall be 75mm long
All vertical joints are to be fully filled
Bond – to be half lap stretcher bond, where not specified
Jointing – to be bucket handle
Vertical joints – even widths to be plumb at every fifth cross joint
Daily Height of lifts – (maximum) 1.5m for any one leaf using cement gauged or hydraulic lime
mortar.
Do not use units with damaged faces or arrises
5.3.3.
Mixing mortar
Proper measures shall be used to determine quantities of materials for mortar and the
materials shall be mixed by machine. If mixed by hand a clean stone or wood banker shall be
used which must be properly cleaned between batches. Mortar when mixed shall be used
immediately and no mortar which has commenced to set shall be worked up and incorporated
in a fresh batch or be used in the work
5.3.4.
Cleaning down facings
The whole of the faced work shall be properly cleaned down on completion but rubbing of
bricks will not be allowed except by permission of the CA
5.3.5.
Brick/Block facework
Prices for brick facework shall include for all cutting being done by machine
Finished work must be of uniform colour and texture, free from patches, horizontal stripes and
racking back marks
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Materials and Workmanship
Do not use units with damaged faces or arrises
Lifts are to be completed in one operation
Use of putlog scaffolding is not permitted in facework
5.3.6.
Damp-proof courses
Prices for damp-proof courses shall include for lapping minimum 100mm at joints and angles
for all cutting and for providing levelling bed or backing in fresh mortar similar to that of the
surrounding work, at least full width of leaf unless otherwise specified
Overall finished joint thickness: as close to normal as possible.
Sill DPC: form and placement – in one piece and turned up at back when sill is in contact with
inner leaf
Coping/capping DPC: placement – bed on one operation to ensure maximum bond between
masonry units, mortar and DPC. DPCs crossing the cavity provide ridged support to prevent
sagging
Sealing DPC – Polyethene DPCs to be sealed with double sided adhesive tape. For all other
materials Adhesive as recommended by DPC manufacture.
Vertical DPCs – form on one piece wherever possible. Joints, upper part overlapping the lower
not less than 100mm.
Jamb DPCs at openings: joint with cavity tray/lintel at head and with sill/horizontal DPC at base
– full underlap. Projection into cavity not less than 25mm. In full contact and fully fastened to
frame with galvanised clout nails or staples.
Prices for damp-proof courses shall include for lapping minimum 100mm at joints and angles
for all cutting and for providing levelling bed or backing in fresh mortar similar to that of the
surrounding work, at least full width of leaf unless otherwise specified
Overall finished joint thickness: as close to normal as possible.
5.3.7.
Cavity Trays
Made on site Cavity Trays installed, in accordance with manufactures instructions. All lapped
joints to be completely sealed, fully supported and lapped by 100mm minimum.
Preformed cloak units must be used at stop ends, all corners, changes in level and cavity trays.
Requirements to prevent downward ingress of water: Profiles to match those shown on
drawings, firmly secured, unjointed where possible otherwise 100mm lap fully sealed.
Cavity trays over openings and other cavity bridging’s – to extend not less than 150mm
beyond ends of lintels/bridging’s.
5.3.8.
Building in or cutting and pinning ends of members and forming holes mortices and
the like
Prices for building in or cutting and pinning ends of members and for mortices and the like in
and holes through brickwork or blockwork shall include for making good as required
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 19
Job No
Section 2
Materials and Workmanship
5.3.9.
Waterproofing membrane
1200 gauge D.P.M lapped into DPC/cavity tray
5.3.10.
Adverse Weather
Do not use frozen materials or lay on frozen surfaces.
Air temperature requirements: do not lay bricks/blocks
- in cement gauged mortars when at or below 3°C and falling or unless it is at least 1°C
and rising
- in hydraulic lime: sand mortars when at or below 5°C and falling or below 3°C and rising
- in thin joint mortar glue when outside the limits set by the mortar manufacturer
Temperature of walling during curing: above freezing until hardened
Newly erected walling: Protect at all times from, rain and snow and from drying out too rapidly
in hot conditions and in drying winds
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 20
Job No
Section 2
Materials and Workmanship
6.
ROOFING/WALL CLADDING
6.1.
Generally
6.1.1.
Codes of Practice
The requirements of the following shall apply where relevant
BS 5427:1996
Profiled sheet for roof and wall cladding
BS 6229:2003
Flat roofs with continuously supported coverings
6.2.
Materials
6.2.1.
Profiled aluminium sheeting for building
Profiled aluminium sheet shall comply with BS 4768
6.2.2.
Fittings and accessories to fibre cement/metal roofing/cladding
Cappings, flashings, trims, gutters, fillers etc. shall unless otherwise specified be as
recommended by the cladding manufacturer.
6.2.3.
Vapour barrier
As indicated on drawing 1039-004-06A
6.2.4.
Nails
All nails shall comply with BS 1202
6.2.5.
Fixing accessories for sheet metal roofing and wall cladding
Fixing accessories for sheet roofing and wall cladding shall comply with BS 1494-1
6.2.6.
Mastic/sealant
Selection of sealant is to be in accordance with BS EN ISO 11600:2003.
One part gun grade polysulfide based sealants shall comply with BS 5215:1986.
6.3.
Pricing Instructions
6.3.1.
EPDM Rubber Roofing Material
Prices of EPDM rubber sheet shall include for laying in accordance with manufacturer’s
instructions and as detailed on drawing 1039-004-06A
6.3.2.
Vapour barrier
Prices of vapour barrier shall include for laying with sealed laps of not less than 50mm
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 21
Job No
Section 2
Materials and Workmanship
6.3.3.
External and Internal Rendering
Coatings are to be applied in one continuous operation between angles and joints and achieve
good adhesion.
Surface to be even, consistent, free from rippling, hollows, ridges, cracks and crazing.
Surface to be finished to a true plane, to correct line and level, with angles and corners to a
right angle unless specified otherwise, and with walls and reveals plumb and square.
Prevent excessively rapid of localized drying out or each coat. Curing, keep each coat damp by
covering with polyethylene sheet and / or spraying with water. For final coat hang sheeting
clear of render.
Allow each coat to dry thoroughly, with drying shrinkage substantially complete before
applying next coat.
Deviation of surface, when measured from the underside of a straight edge to be 3mm in any
consecutive length of 1800mm.
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 22
Job No
Section 2
Materials and Workmanship
7.
WOODWORK
7.1.
Generally
7.1.1.
Codes of practice
The requirements of the following codes shall apply where relevant:-
7.1.2.
BS 5268-2 to 6
The structural use of timber
BS 8103-3:1996
Structural design for low rise buildings – timber roof
BS 8213-1:2004
Installation of windows and doorsets
Inspection
Facilities shall be afforded to the CA for inspection of timber in Merchant's yard and
Manufacturer's workshops should he so direct
7.1.3.
Sizes
Cross section dimensions of structural softwood and hardwood shall comply with BS EN
336:2003
Cross section dimensions of non structural softwood shall comply with BS EN 1313-1:1997
Cross section dimensions of non structural hardwood shall comply with BS EN 1313-2:1999
Wrought timbers have been given as finished sizes unless otherwise described
7.2.
Materials
7.2.1.
Timber generally
Timber generally shall be as tabulated in BS 7359 in respect of names and sources of supply
7.2.2.
Timber classifications shall be as follows: Carcassing - all structural timbers
Carpentry - roof and gutter boarding etc., feather edge boarding, firrings, fillets, rolls,
grounds, bearers, battens, framework and other items of a carpentry nature
Joinery wood trim - weatherboarding, eaves and verge boarding fascias and barge boards
etc., wall ceiling and beam boarding etc., skirtings, rails, architraves, cover fillets, beads,
shelves, window boards, nosings and other items of a similar nature
Manufactured joinery - doors, windows, screens etc., staircases, steps, balustrades and
handrails etc., fittings and other items of a similar nature
7.2.3.
Softwood types and species for use under the various timber classifications
Carcassing - any of those named in BS 5268-2:2002 Tables 2, 3 and 4
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 23
Job No
Section 2
Materials and Workmanship
Carpentry - any of those named in BS 5268-2:2002 Tables 3 and 4
Joinery - any of those named in and complying with BS 1186-3:1990 and BS EN 942:2007
suitable for the particular purpose as tabulated in the BS
7.2.4.
Softwood grades and classes for use under the various timber classifications
Softwood for timber classified as carcassing shall be graded in accordance with BS EN
338:2003 / BS EN 519 / BS 4978:2007
All machine graded timber shall bear the BSI Kite mark
Softwood for timber classified as carpentry shall be equivalent to general structural grade as
defined in BS 5268-2;2002 Tables 3 and 4
Softwood for timber classified as joinery wood trim shall comply with the following class of
BS 1186-3
Class 2 and 3
-
Softwood for general purpose trim
Class 1
Softwood for high quality or specialised trim and as
appropriate in the specified use
Class CSH
Softwood (for clear grade) for high quality or specialised
trim and as appropriate in the specified use
Softwood for timber classified as manufactured joinery shall comply with the following class
of BS EN 942
7.2.5.
Class J10
Softwood generally
Class J2
Softwood described as selected
Hardwood types and species for use under the various timber classifications
Joinery - to comply with BS 1186-3:1990 and BS EN 942:2007
7.2.6.
Hardwood grades and classes for use under the various timber classifications
Tropical hardwood for timber classified as carcassing shall be Grade HS as defined in BS
5756:2007 Strength Class in accordance with BS EN 338:2003
Hardwood for timber classified as carpentry shall be equivalent to Grade HS as defined in BS
5756:2007
7.2.7.
Hardwood for timber classified as joinery wood trim shall comply with BS 1186-3
Class 2 and 3
Hardwood for general purpose trim
Class 1
Hardwood for high quality and specialised trim
Class CSH
Hardwood (for clear grade) for high quality or specialised
trim and as appropriate in the specified use
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 24
Job No
Section 2
Materials and Workmanship
7.2.8.
7.2.9.
Hardwood for timber classified as manufactured joinery shall comply with the
following class of BS EN 942
Class J10
Hardwood generally
Class J2
Hardwood described as selected
Moisture content of timber
Moisture content of timbers classified as carcassing or carpentry shall at the time of
manufacture or erection be in accordance with Table l of BS 5268
Moisture content of timbers classified as joinery shall at time of fixing or erection be in
accordance with BS 1186-3:1990 or BS EN 942:2007 as appropriate
The Contractor shall establish the temperature ranges within the building, and advise the CA
if these temperatures will be deleterious to the new timber.
7.2.10.
Regularised timber
Timber described as "regularised" shall be machined to ensure that the thickness and/or
width of the piece of timber of rectangular cross section is made uniform throughout its
length and the minimum size shall be that stated
7.2.11.
"British Standard" wood trim
References quoted in items of wood trim are to comply with BS 1186-3:1990.
7.2.12.
Timber preservation
Timber described as impregnated (subsequently to receive paint stain or clear finish) shall be
subjected to double vacuum impregnation using an approved organic solvent preservative
containing a fungicide and contact insecticide as defined in BS 5707:1997
All timber to be treated or impregnated shall be machined to its final dimensions but when
subsequent cross cutting notching or holing etc., of impregnated timber is necessary all such
cuts and holed surfaces shall be liberally swabbed with the appropriate type of end grain
sealer. Rip sawn or re-machined pieces must be re-impregnated
All timber preservation shall be carried out by a specialist firm to the appropriate BS or
specification of the British Wood Preserving Association unless otherwise stated
Certificates of treatment giving type of preservative used and method of application shall be
supplied to the CA
The type of preservative used shall not lead to accelerated corrosion of metal fastenings
plates etc., or to a reduction of the efficiency of the joints
7.2.13.
Plywood
Plywood for use in dry conditions shall comply with the requirements of BS EN 636:1995,
Appearance Class to BS EN 635:1995 of the appropriate Class; Bond Quality to BS EN 3142:1993 Class 1
Plywood for use in exterior conditions shall comply with the requirements of BS EN
636:1995, Appearance Class to BS EN 635:1995 of the appropriate Class; Bond Quality to BS
EN 314-2:1993 Class 3 and preservative treatment to British Wood Preserving or Damp-
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 25
Job No
Section 2
Materials and Workmanship
proofing Association Commodity Specification C
7.2.14.
Marine plywood
Marine plywood shall comply with BS 1088-1 and 2:2003.
7.2.15.
Flush doors
Solid core flush doors shall comprise a solid laminated timber/board core
7.2.16.
Wood doorsets, door leaves and frames
Standard wood doorsets, door leaves and frames (metric size) shall comply with
BS 4787:1980 Part 1 Dimensional Requirements
All external doors to be provided with half round drips set 25mm back from the leading edge.
7.2.17.
Fire resisting timber doors/doorsets
Provide evidence to the CA, in the form of a product conformity certificate, test report or
engineering assessment, that each fire door/doorset supplied will comply with the specified
requirements for fire resistance if tested in accordance with BS 476:Part 22 and 31 and
BS EN 1634-1 and 3. Such certification must cover door and frame materials, glass and
glazing materials and installation, essential and ancillary ironmongery, hinges and seals
7.2.18.
Mastic/sealant
All selection of sealants is to be to BS EN ISO 11600:2003.
Silicone based sealant shall comply with BS 5889:1989.
One part gun grade polysulfide based sealant shall comply with BS 5215:1986.
7.2.19.
Building membranes
flexible building membrane (breather type) shall comply with BS 4016
7.2.20.
Thermal insulation products for buildings
Factory made mineral wool (MW) products shall comply with BS EN 13162
Factory made products of expanded polystyrene (EPS) shall comply with BS 3837-1/BS EN
13163
Factory made products of extruded polystyrene (XPS) shall comply with BS EN 13164
Factory made rigid polyurethane foam (PUR) shall comply with BS EN 13165
Rigid urethane laminated board shall comply with BS 4841
Factory made products of phenolic foam (PF) shall comply with BS EN 13166
Factory made cellular glass (CG) products shall comply with BS EN 13167
Bonded man made mineral fibre slabs shall comply with BS 3958-5
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 26
Job No
Section 2
Materials and Workmanship
7.2.21.
Ironmongery
Single axis hinges shall comply with BS EN 1935
Locks and latches shall comply with BS EN 12209
Lock and latch furniture shall comply with BS EN 1906
Thief resistant locks shall comply with BS 3621 and be kite marked
Thief resistant lock assemblies, keyless egress shall comply with BS 8621
Cylinders for locks shall comply with BS EN 1303
All locks shall differ. Each lock shall unless otherwise described be supplied with a minimum
of two keys clearly labelled
Lever handles and knob furniture shall comply with BS 1906
Bolts shall comply with BS EN 12051
Letter plates shall comply with BS EN 13724
Overhead door closers shall comply with BS EN 1154
Panic and emergency exit devices shall comply with BS EN 1125 and BS EN 179
Fire safety signs, notices and graphic symbols shall comply with BS 5499
Ironmongery to fire doors shall in addition comply with BS 476-22 or BS EN 1634-1
7.2.22.
Nails
Nails shall comply with BS 1202-1 to 3:2002/1974.
7.2.23.
Steel bolts etc.
Black bolts and nuts shall comply with BS EN ISO 898 and BS EN 20898 with appropriate
washers
Black cup and countersunk head bolts and nuts shall comply with BS 4943, washers shall
comply with BS 4320/BS 4460
7.2.24.
Metal timber connectors
Metal timber connectors shall comply with BS EN 912:2000.
7.2.25.
Metal joist hangers and straps etc.
Joist hangers and straps etc. shall comply with BS EN 845-1:2003.
7.2.26.
Anti corrosion finishes for bolts and fasteners
Galvanizing to BS 7371-6/sherardizing to BS 7371-8/zinc plating to BS EN ISO 4042 as
specified or to suit conditions in service
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 27
Job No
Section 2
Materials and Workmanship
7.3.
Workmanship
7.3.1.
Construction generally
The whole of the work shall be carried out with proper scarfs, laps, mitres, tenons, housing
etc. as may be necessary to give sound and solid construction and in accordance with BS
5268 or BS 1186-2 as appropriate
Wrought work shall be properly finished with a smooth even surface well rubbed down to
remove all plane and machine marks
Any work which warps, splits, shrinks or shows other defects shall be replaced with new if so
directed by the CA
7.3.2.
Storage etc. of woodwork
Woodwork shall be stored in conditions suitable for the specified moisture content, the store
being properly ventilated and capable of protecting the contents from prolonged exposure to
direct sunlight. In the case of manufactured components etc. the fabricators'
recommendations in respect of handling and storing on site shall be followed
7.3.3.
Fixing ironmongery
Lips of striking plates shall be finished flush with frames or linings
7.3.4.
Bolts nuts and washers
Bolts shall show two clear threads beyond the nut and be fitted with the correct flat or
bevelled washer and no thread shall bear upon the thicknesses connected
7.4.
Pricing Instructions
7.4.1.
Timber kept clean
Prices for timber described as kept clean to receive polish, oil, stain, etc. or to remain
undecorated and shall include for matching adjacent pieces of timber to a similar grain
configuration colour etc., as required and for finishing with a fine scraped or glass papered
surface
7.4.2.
Rounded arris
Prices for all timbers classified as joinery shall include for slightly rounded arris formed by
glass paper where required.
7.4.3.
Windows and doors
Prices for windows and doors shall include for all necessary templates to form openings of
the required sizes and for cleaning off protective material on completion
7.4.4.
Easing and adjusting
Prices for fixing ironmongery to timber shall include for fixing to softwood, hardwood,
blockboard particle board and the like.
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 28
Job No
Section 2
Materials and Workmanship
8.
STRUCTURAL STEELWORK
8.1.
Generally
8.1.1.
National Structural Steelwork Specification
All work shall comply with the National Structural Steelwork Specification for building
construction (latest Edition) issued by the British Constructional Steelwork Association Ltd
unless specified otherwise in this work section
8.1.2.
Codes of practice and British Standards
The requirements of the following shall apply where relevant
BS EN ISO 12944/
BS EN ISO 14713
The protective coating of iron and steel against corrosion
BS 5531
Safety in erecting structural frames
BS 5950
Structural use of steelwork in building
8.2.
Materials
8.2.1.
Steel
Steel shall comply with BS 5950-2
8.2.2.
Steel sections
Hot rolled steel sections shall comply with BS 4-1
Hot finished steel hollow sections shall comply with BS EN 10210-2
Structural steel equal and unequal angles shall comply with BS EN 10056-1 and 2
Cold rolled steel sections shall comply with BS EN 10162
8.2.3.
Bolts etc.
Holding down bolts shall comply with BS 7419
8.2.4.
Galvanizing
Hot dip galvanizing shall comply with BS EN ISO 1461
8.2.5.
Priming Paint
Zinc rich priming paint for steelwork shall comply with BS 4652
8.2.6.
Inspection and testing materials
Facilities for inspection and testing shall be afforded at all reasonable times at the works and
on the site
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 29
Job No
Section 2
Materials and Workmanship
8.3.
Workmanship
8.3.1.
Preparation of steel surfaces
Surfaces of steelwork to be encased in concrete shall be thoroughly scraped and wire
brushed free from dirt, loose rust, scale and grease etc.
Surfaces of steelwork to be painted shall be prepared by abrasive blast cleaning to BS 7079
Grade SA 2 ½ unless otherwise specified
Note: - contact surfaces at high strength friction grip bolted connections shall not be primed
8.4.
Pricing Instructions
8.4.1.
Galvanized steelwork
The specified weights of galvanized steelwork are the weights of steel before galvanizing;
prices for supplying and erecting galvanized steelwork shall include for the additional cost for
weight of galvanizing
8.4.2.
Priming steelwork
Prices for priming steel works shall include for touching up defective areas of priming on site
as necessary
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 30
Job No
Section 2
Materials and Workmanship
9.
METALWORK
9.1.
Generally
9.1.1.
Codes of practice
The requirements of the following shall apply where relevant
BS EN ISO 1491:2009
Galvanizing
BS 4921:1988
Sherardising
BS EN ISO 2081:2008
Zinc plating
BS 8118-1 AND 3
Structural aluminium
9.2.
Materials
9.2.1.
Steel sections
Steel shall comply with BS 5950-2 of the grade stated
Steel sections shall comply with BS 4-1 and/or BS EN 10056
Steel hollow sections shall comply with BS EN 10210-2
Cold rolled steel sections shall comply with BS EN 10162
9.2.2.
Steel plate/sheet/strip
Steel plate/sheet/strip shall comply with BS 1449-1:1991.
9.2.3.
Aluminium alloy sections for structural purpose
Aluminium alloy sections for structural purposes shall comply with BS 1161
9.2.4.
Aluminium and aluminium alloy extruded sections
Rod/bar, tube and profiles shall comply with BS EN 755:1997.
9.2.5.
Steel door frames
Steel door frames shall comply with BS 1245
9.2.6.
Bolts etc.
Steel hexagon bolts, screws and nuts shall comply with BS 4190:2001 with appropriate
washers.
9.2.7.
Mastic/sealant
Silicone based sealants shall comply with BS 5889:1989.
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 31
Job No
Section 2
Materials and Workmanship
One part gun grade polysulphide based sealants shall with BS 5215:1996.
9.3.
Workmanship
9.3.1.
Bolts etc.
Bolts shall show two clear threads beyond the nut and be fitted with the correct flat or
tapered washer and no thread shall bear upon the thicknesses connected
9.3.2.
Welding
Welding and testing shall comply with the appropriate British Standards
9.3.3.
Preparation of steel surfaces
Surfaces of steel to be painted shall be prepared by abrasive blast cleaning to BS 7079:2009.
9.4.
Pricing Instructions
9.4.1.
Joints in the length
Prices of long members or composite joints shall include for joints made by fabricator to
facilitate transport and fixing.
9.4.2.
Bolts in connections
Prices of bolts in connections shall unless otherwise stated include for nut and washer, the
washer tapered where necessary.
9.4.3.
Intumescent Coatings for Fire Protection of Steelwork
Intumescent Coatings are to be water based to achieve 120 minutes fire resistance to BS
476-21:1987 and applied in accordance with BS 8202-2:1992. Prior to application the steel
is to be blast cleaned to remove all rust and adhesions, apply primer (recommended by
intumescent coating manufacture) then intumescent coating to the required thickness
followed by a top sealer coat in accordance with the manufactures instructions.
Exposed faces of steelwork to be coated as noted on the CAs drawings sections DS6, DS24,
DS25, DS29 and DS33.
Apply Nullifire S707-120 waterborne basecoat to the required thickness, over a suitable
primer and apply TS816 top seal to manufactures instructions all to achieve 120 minutes fire
resistance to steelwork.
9.4.4.
Welded work
Prices for welded work shall unless otherwise stated include for preparing welding and
grinding to a smooth finish
9.4.5.
Metal windows and doors
Prices for metal windows and doors shall include for all necessary templates to form
openings of the required sizes and for cleaning off protective material on completion
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 32
Job No
Section 2
Materials and Workmanship
9.4.6.
Finished Work
Finish work is to be rigid free from distortion, cracks, burrs and sharp edges. Moving parts
are to be free moving without binding.
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 33
Job No
Section 2
Materials and Workmanship
10.
PLUMBING AND ENGINEERING INSTALLATIONS
10.1.
Generally
10.1.1.
Codes of practice
The requirements of the following shall apply where relevant: -
10.1.2.
BS 5440-1
Flues for gas appliances
BS 6798
Gas heating
BS EN 12056-3
Drainage of roofs and paved areas
BS 6891
Low pressure gas pipework up to 28mm in domestic premises
Statutory requirements
The Contractor shall ascertain the requirements of the Water Undertaker's Regulations and
conform thereto
Notwithstanding the British Standard Materials, weights, gauges and thickness to which pipes
and tubing generally shall conform the pipes and tubing shall conform to the Regulations of the
Water Undertaker and shall be of the weights or gauges to withstand the highest pressure
occurring in the Water Undertaker's mains
10.1.3.
Water Supply
The supply of water shall comply with the current Water Supply (Water Quality) Regulations
10.2.
Materials
10.2.1.
Unplasticised PVC rainwater goods and accessories
Unplasticised PVC rainwater gutters and accessories shall comply with BS EN 607
Unplasticised PVC rainwater pipes and accessories shall comply with BS EN 12200
Unplasticised poly (vinyl chloride) (PVCu) pipes and fittings with sealed joints shall comply with
BS 4514/BS EN 1329-1
10.2.2.
Brackets for gutters
Brackets shall comply with BS EN 1462
10.2.3.
Steel tubing tubular fittings and accessories
Steel tubing and tubular shall comply with BS 1387 black/galvanized
Fittings for use with steel tubing shall comply with BS EN 10341/BS EN 10242 black or
galvanized to match pipe
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 34
Job No
Section 2
Materials and Workmanship
10.2.4.
Copper tubing fittings and accessories
Copper tubing shall comply with BS EN 1057
Fittings for use with copper tubing shall comply with BS EN 1254-1, 2 and 4
10.2.5.
Cast iron soil, waste and ventilating pipes, fittings and accessories
Cast and spun iron pipes, fittings and accessories with spigot and socket joints shall comply
with BS 416
Cast and spun iron pipes, fittings and accessories for socket less systems shall comply with
BS EN 877
10.2.6.
Air admittance valves
Air admittance valves shall comply with BS EN 12380
10.2.7.
Sheet metal flue pipes and accessories
Sheet metal flue pipes and accessories shall be steel/aluminium spigot and socket to comply
with BS 715
10.2.8.
Jointing materials and compounds
Thread sealing tape shall be unsintered PTFE tape to comply with BS 7786
Solvent weld cement shall be as recommended by the manufacturer of the plastics pipes and
fittings
Plastic connectors for use with horizontal outlet vitreous china wc pans shall comply with
BS 5627
10.3.
Workmanship
10.3.1.
Jointing gutters
Unplasticised pvc gutters and fittings shall unless otherwise stated have patent slide or snap fit
joints incorporating seal
10.3.2.
Jointing rainwater pipes
Unplasticised pvc rainwater pipes fixed externally shall have push fit joints and those fixed
internally shall have rubber "O" ring/solvent welded joints
10.3.3.
Jointing black/galvanized steel tubing
Black/galvanized steel tubing and fittings shall have screwed joints put together with white
hempen spun yarn and non-tainting leadless compound
10.3.4.
Jointing copper tubing
Copper tubing shall be jointed with capillary/compression type fittings
10.3.5.
Jointing flue pipes
Sheet metal flue pipes and fittings shall have joints made with suitable fire resisting compound
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 35
Job No
Section 2
Materials and Workmanship
10.4.
Pricing Instructions
10.4.1.
Making good
10.4.2.
Prices for building in or cutting and pinning ends of supports for pipes, equipment, ancillaries
and the like and for all mortices, sinkings, holes and the like in the structure and its finishing’s
shall include for making good as required
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 36
Job No
Section 2
Materials and Workmanship
11.
ELECTRICAL INSTALLATIONS
11.1.
Generally
11.1.1.
Codes of practice
The requirements of the following shall apply where relevant:-
11.1.2.
BS 6651
Protection of structures against lightning
BS 7375
Distribution of electricity on construction and building sites
BS 7430
Earthing
BS ISO 8995
Artificial lighting
Statutory and other requirements
The Contractor shall ascertain the requirements of the Electricity Undertaker's Regulations and
conform thereto
The finished installations shall comply with the Regulations for the Electrical Equipment of
Buildings issued by the Institution of Electrical Engineers, Current Edition and amendments
11.2.
Materials
11.2.1.
Conduits and fittings
Conduit systems shall comply with BS EN 50086/BS EN 61386
11.2.2.
Cable trunking
Cable trunking and cable ducting systems shall comply with BS EN 50085
11.2.3.
Cables
PVC insulated cables shall comply with BS 6004
11.2.4.
Insulated flexible cords
Insulated flexible cords shall comply with BS 6500
11.2.5.
Earthing clamps
Earthing clamps shall comply with BS 951
11.2.6.
Accessories
Accessories shall comply with the requirements of BS 5733
11.2.7.
Accessory boxes
Accessory boxes shall comply with BS 4662
11.2.8.
Junction boxes
Junction boxes shall comply with BS 6220
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
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Job No
Section 2
Materials and Workmanship
11.2.9.
Switches
Switches shall comply with BS EN 60669-1
11.2.10.
Appliance couplers
Appliance couplers shall comply with the requirements of BS EN 60320
11.2.11.
13A plugs socket outlets and connection units
13A plugs, socket outlets and connection units shall comply with BS 1363
11.2.12.
Cartridge fuses and fuse links
Cartridge fuses and fuse links shall comply with BS 1361 and/or BS 1362
11.2.13.
Luminaries
Luminaries shall comply with the requirements of BS EN 60598
11.2.14.
Earth leakage circuit
A.C. voltage operated earth leakage circuit breakers shall comply with BS 842
Current operated earth leakage circuit breakers shall comply with BS 4293/BS EN 61008
11.2.15.
Consumers' control units
Consumers control units shall comply with BS EN 60439-3
11.3.
Workmanship
11.3.1.
Fixing conduit
Conduit unless otherwise stated shall be fixed with saddles/crampets
11.3.2.
Jointing and fixing trunking
Trunking shall have joints made with connectors to provide adequate mechanical joints
and shall be fixed with supports
11.4.
Pricing Instructions
11.4.1.
Making good
Prices for building in or cutting and pinning ends of supports for conduit, cable,
equipment, ancillaries, fittings, trunking and the like and for all mortices, sinkings, holes and
the like in the structure and its finishing’s shall include for making good as required
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 38
Job No
Section 2
Materials and Workmanship
12.
FLOOR WALL AND CEILING FINISHES
12.1.
Generally
12.1.1.
Codes of practice
The requirements of the following shall apply where relevant
BS EN 13914-1/2:2005
12.2.
Materials
12.2.1.
Cement
Design, preparation and application of external rendering
All cement shall be supplied by manufacturers who are BSI registered firms of assessed
capability.
Cement Test Certificates bearing the manufacturers certificate number shall if required be
made available to the CA.
White cement shall be white Portland to comply with the requirements of BS EN 197 Part 1.
12.2.2.
Aggregate (sand)
Aggregate (sand) for paving and screeds etc. shall comply with BS EN 13139:2002 Category 3
and BS EN 12620:2002. Grading limit to BS8204-1 and 2:2003 Table 1
12.2.3.
External rendering
External rendering shall comply with BS EN 13914-1:2005.
12.2.4.
Metal beads
Galvanized metal beads shall comply with BS 6452-1:1984.
Stainless steel for beads shall comply with BS EN 10088-1:2005.
12.2.5.
Reinforcement to screeds
Fabric reinforcement shall comply with BS 4483
12.3.
Workmanship
12.3.1.
Storage of materials
Sand and other aggregates shall be separately stored and maintained in a clean condition with
adequate drainage facilities
Plasters cement and lime etc., shall be separately stored and maintained under dry conditions
Board, sheet and tile materials shall be stored as for plasters etc. and stacked in accordance
with manufacturers’ directions where such exist
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
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Job No
Section 2
Materials and Workmanship
12.3.2.
Preparation of surfaces
All surfaces to receive render shall be thoroughly brushed down or otherwise cleaned to
remove all dust, loose particles, laitance, efflorescence, grease or oil
The Contractor shall take full responsibility for providing an adequate key for rendering etc., on
brick/blockwork
12.3.3.
External Rendering
Render below DPC level to be on expanded metal lath, contain sulphate resisting cement and
be separated from that above DPC.
12.4.
Pricing Instructions
12.4.1.
Expanded metal lathing
Prices of expanded metal lathing shall include for fixing to provide a taut, firm base for plaster
or render. Long way of mesh horizontal. Laps: sides 25mm, ends 50mm at supports, do not
locate laps within 100mm or angles or bends. Fix sheets – perimeter edges 150mm centres,
general areas at 100mm vertical and horizontal centres maximum.
12.4.2.
Plywood ceiling
Prices shall include for all necessary additional bearers/noggins etc. for the fixing of 18mm
plywood to underside of ceiling members
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 40
Job No
Section 2
Materials and Workmanship
13.
FLOOR WALL AND CEILING FINISHES
13.1.
Generally
13.1.1.
Codes of practice
The requirements of the following shall apply where relevant
BS 8204-1
Screeds to receive in-situ flooring
BS 8204-2:2003
Concrete wearing surfaces
BS 8204-3:2004
Polymer modified cementitious wearing surfaces
BS 8204-7
Pumpable self smoothing screeds
13.2.
Materials
13.2.1.
Term “plastering”
The term “Plastering” where used in Workmanship and Pricing Instruction Clauses shall be
taken to cover all plastering, cement and sand and cement lime and sand rendering,
plainfaces, beds and backings
13.2.2.
Cement
All cement shall be supplied by manufacturers who are BSI registered firms of assessed
capability.
Cement Test Certificates bearing the manufacturers certificate number shall if required be
made available to the CA.
White cement shall be white Portland to comply with the requirements of BS EN 197 Part 1.
13.2.3.
Lime
Lime shall comply with BS EN 459-1:2001.
13.2.4.
Aggregate (sand)
Aggregate (sand) for paving and screeds etc. shall comply with BS EN 13139:2002 Category 3
and BS EN 12620:2002. Grading limit to BS8204-1 and 2:2003 Table 1
13.2.5.
Ready mixed mortars
Ready mixed rendering and plastering mortars shall comply with BS EN 998-1:2003
13.2.6.
External rendering
External rendering shall comply with BS EN 13914-1:2005.
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 41
Job No
Section 2
Materials and Workmanship
13.2.7.
Dubbing
In all cases dubbing shall be carried out in similar material to that of the first floating coat of
plaster
13.2.8.
Bonding agent/additive
Bonding agent shall be Polyvinyl acetate (PVAC) emulsion bonding agent (for internal use with
gypsum building plaster) to comply with BS 5270-1 suitable for use with the stated plaster
system
13.2.9.
Metal lathing
Expanded and ribbed metal lathing shall comply with BS 1369-1:1995.
13.2.10.
Staples
Staples for fixing metal lathing shall be 32mm galvanized wire staples.
13.2.11.
Floor insulation
Expanded polystyrene boards to comply with BS 3837-1/BS EN 13163:2008, boards
manufactured from expandable beads.
Expanded polystyrene board to comply with BS EN 13164:2008, extruded boards
13.2.12.
Reinforcement to screeds
Fabric reinforcement shall comply with BS 4483
13.3.
Workmanship
13.3.1.
Storage of materials
Sand and other aggregates shall be separately stored and maintained in a clean condition with
adequate drainage facilities
Plasters cement and lime etc., shall be separately stored and maintained under dry conditions
Board, sheet and tile materials shall be stored as for plasters etc. and stacked in accordance
with manufacturers’ directions where such exist
13.3.2.
Preparation of surfaces
All surfaces to receive plastering shall be thoroughly brushed down or otherwise cleaned to
remove all dust, loose particles, laitance, efflorescence, grease or oil
The Contractor shall take full responsibility for providing an adequate key for plastering etc., on
concrete
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 42
Job No
Section 2
Materials and Workmanship
13.3.3.
External Rendering
Render below DPC level to be on expanded metal lath, contain sulphate resisting cement and
be separated from that above DPC. Render to retaining walls, flues/chimneys to be on
expanded metal lath, contain sulphate resisting cement.
13.3.4.
Cement and sand screeded floated or trowelled beds
Cement and sand screeded, floated or trowelled beds shall unless otherwise described be of
“Separate Construction”. For preparation of the base concrete to receive the beds see pricing
instructions
13.4.
Pricing Instructions
13.4.1.
Plastering
Prices for plastering on brick and block walls shall be deemed to include for plastering on
isolated areas of concrete or expanded metal lathing.
Prices for plastering on concrete shall include for PVA bonding agent applied to the concrete.
Prices for plastering on existing brick or block walls shall include for any necessary raking out
of joints, sparrow pecking or other means to provide an adequate key.
13.4.2.
Preparatory work
Prices for in-situ paving’s and beds laid directly on concrete shall include for all necessary
preparation of the base concrete to ensure a good bond
13.4.3.
Masking adjacent work
Prices for finishes which are thrown or sprayed on shall include for properly masking adjoining
surfaces and afterwards clearing away the protective material
13.4.4.
Expanded metal lathing
Prices of expanded metal lathing shall include for fixing to provide a taut, firm base for plaster
or render. Long way of mesh horizontal. Laps: sides 25mm, ends 50mm at supports, do not
locate laps within 100mm or angles or bends. Fix sheets – perimeter edges 150mm centres,
general areas at 100mm vertical and horizontal centres maximum.
13.4.5.
Thickness of screeds
The stated thickness of screeds are the minimum thickness at any one point and prices shall
include for any costs associated with screeds being thicker than stated
13.4.6.
Surface finish to screeds
Prices for screeds shall include for finishing with a surface suitable to receive the various
finishes laid thereon. Should the surface not prove to be suitable the additional cost of a selflevelling screed or any other remedial works required shall be entirely at the Contractors own
expense
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 43
Job No
Section 2
Materials and Workmanship
14.
PAINTING AND DECORATING
14.1.
Generally
14.1.1.
Codes of practice
Painting and decorating generally shall comply with the requirements of BS6150.
The Contractor should note however that the instructions or directions of individual
manufacturers in respect of preparation of surfaces grade of paint or other materials and
application of same should be followed where such instructions or directions conflict with the
provisions of the Code and/or the following descriptions of Materials and Workmanship
The requirement of the following shall apply where relevant
BS 6150:2006
Painting of buildings.
BS EN ISO 12944:1998 and
BS EN ISO 14713:1999
Protective coating of iron and steel structures from corrosion.
BS 8202-2:1992
Use of intumescent coating systems to metallic substances for
providing fire resistance.
14.1.2.
Colours
14.1.3.
The range of colours available for use shall be that as defined in BS 4800:1989 plus the
additional "Trade" colours of individual manufacturers.
14.1.4.
Delivery and storage of materials
14.1.5.
All materials shall be delivered to the site in unopened containers bearing the manufacturers
printed labels and shall be stored so as to minimise exposure to extremes of temperature
14.1.6.
Term "Paint" and "Paint System"
14.1.7.
Term "Paint" shall be deemed to include plastic and clear finishes, varnish, preservatives and
like materials and the term "Paint System" shall be deemed to include systems using all or any
of the above materials
14.1.8.
Priming paints
Primers for woodwork shall comply with BS 7956:2000.
14.1.9.
Undercoat and finishing paints
Undercoat and finishing paints shall comply with BS 6150:2006.
14.1.10.
Paint systems
In all cases the priming, undercoating and finishing paints comprising a paint system shall be
obtained from the same manufacturer. The use of one manufacturer's product over another's
will not be permitted
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 44
Job No
Section 2
Materials and Workmanship
Priming and undercoating used in a paint system shall be of the best grade and as
recommended by the manufacturer for use with his particular finishing having due regard to
the substrate to be painted and the position of the work
Pre-treatment solutions, etching primer, sealers, knotting, stopping, plaster and grain fillers,
thinners, linseed oil and other painting sundries used in or in conjunction with a paint system
shall be of the best grade and as recommended by the manufacturer. Any of the foregoing
not manufactured or supplied by the manufacturer specifically for use with his other products
shall be obtained from a source he shall recommend and shall comply with relevant British
Standard Specifications where such exist
All paint systems shall be to the approval of the CA
All paints and other materials shall be lead free
14.1.11.
Sundry work
Paints for sundry work shall be of the best grade and as recommended by the manufacture
having due regard to the substrate to be painted and the position of the work
14.2.
Workmanship
14.2.1.
Preparation of new surfaces
Preparation of surfaces shall generally comply with BS 6150:2006 or be as recommended by
the manufacturer of the finish being applied. Where in conflict the manufacturers
recommendations shall take preference
14.2.2.
Preparation of surfaces for repainting and redecoration
Preparation of surfaces shall be as recommended by the manufacturer of the finish being
applied and where in conflict with the following the manufacturers recommendations shall take
preference
The term "made good" used in the following descriptions shall be deemed to include for
treating any mould or algae infected surfaces with an appropriate fungicidal solution filling and
making good with appropriate materials, all cracks, holes and other defects in the various
surfaces to be redecorated, for rubbing down all fillings etc., smooth and level with adjoining
surfaces and touching up with appropriate primer and for properly rubbing down touching up
with appropriate primer and bringing forward all bare or flaked patches of old decoration. In
the case of plastered surfaces any minor patches of defective plaster, large cracks etc., shall be
cut out for the necessary widths and lengths with undercut edges to form proper key
Surfaces from which paper has been stripped shall be thoroughly washed down to remove all
traces of paste and size and afterwards properly examined and made good
Sizebound distempered, limewashed or cement painted surfaces shall be brushed down (dry)
to remove any efflorescence washed down to remove old distemper and thoroughly rinsed
with clean water or scraped and brushed with stiff fibre brushes to remove all loose limewash
or cement paint back to firm edge. Any areas of oil or grease shall be scraped and washed
with white spirit or other degreasing liquid and sealed with a spirit based sealer if required.
After the foregoing work has been completed the surfaces shall be properly examined and
made good
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 45
Job No
Section 2
Materials and Workmanship
Oil bound distempered, washable water painted or emulsion painted surfaces shall be scraped
and brushed to remove any efflorescence and all loose or flaking material back to a firm edge,
washed down thoroughly with sugar soap or detergent solution to remove all dirt grease etc.,
and well rinsed off with clean water. After the foregoing work has been completed the
surfaces shall be properly examined and made good
Oil painted enamelled or varnished surfaces not required to be burned off shall be washed
down with sugar soap or detergent solution well rubbed down (wet) to a smooth surface with
pumice stone or waterproof abrasive paper and well rinsed off with clean water. Any flaked or
defective patches of paint etc., shall be removed by patent stripper or in the case of paint on
metal by scraper or wire brush back to a firm edge. After the foregoing work has been
completed the surfaces shall be properly examined and made good
Woodwork required to have paint etc., stripped off shall afterwards be glass papered down to
a smooth surface and dusted off. All knots and any resinous parts shall be treated with a thin
coat of knotting or other appropriate sealer as recommended and after priming the surface
shall be properly examined and made good
Polished surfaces shall be cleaned free from dirt, grease etc., rubbed down with fine abrasive
paper if required, properly examined and made good
Anaglypta, wallpapered or lining papered surfaces shall be properly examined to ensure the
material is in sound condition and properly adhering to the background. Any lifting edges or
areas shall be pasted as required to ensure perfect adhesion and the whole shall be dusted
down. Wallpapers printed in colours which are liable to "bleed" must be treated with an
appropriate sealer. After the foregoing work has been completed the surfaces shall be
re-examined and made good
Generally - all nails screws old fixings and projections etc. shall be removed and the surfaces
made good
14.2.3.
Application of paint etc.
All paints shall be used and applied strictly in accordance with the manufacturers instructions
No paint shall be applied to surfaces which are damp from any cause
All paints etc., shall be applied by brush but the use of rollers for certain undercoats and
finishing coats will be permitted for internal work only if so recommended by the manufacturer.
Spray painting where required has been so described in the measured work
No external painting etc., shall be executed in wet or damp weather
14.3.
Pricing Instructions
14.3.1.
Finishing paint as undercoat
Prices of painting systems shall include for using finishing paint as undercoating where
recommended by the manufacturer
14.3.2.
Spray painting
Prices for spray painting shall include for properly masking the surrounding areas
14.3.3.
Priming wood
Prices for priming wood shall include for all end grain being double primed
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 46
Job No
Section 2
Materials and Workmanship
14.3.4.
Painting windows and doors
Prices for paint or stain etc. on new or existing windows and doors shall include for taking off
and refixing ironmongery
14.3.5.
Painting door and window frames and edges of doors incorporating seals or the
like
Prices for paint or stain on door and window frames and edges of doors having intumescent
strips weather-stripping or the like shall include for any necessary cutting in to both sides of
insert
14.3.6.
Painting boarded surfaces
Prices for stain etc. on boarded surfaces shall include for applying first coat prior to fixing
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 47
Job No
Section 2
Materials and Workmanship
15.
SCAFFOLD
15.1.
Generally
Scaffold must be erected in compliance with latest standard/Code of Practice is anchored
floor boards, edge boards etc. and shall have fans fully boarded over all entrances
This specification shall be applied to scaffolding erected in compliance with BS EN 12811-1 –
Code of Practice for Access and Working Scaffolds and Special Scaffold Structures in Steel,
together with BT Security Specification 11.10
Scaffolding erected against a building(s) on a public side(s) then temporary security fencing
shall be erected to provide not less than 1 metre stand off to the scaffold, or any overhangs
If scaffolding is erected against a public side(s) of a building(s), over, say, a footpath,
strenuous efforts shall be made to the local council to agree the provision a protected
extended or re-routed pathway, so as to allow construction of a temporary security barrier
If scaffolding is erected on the public side(s) of a building(s), offering no scope for
temporary security fencing, then such measures to reduce climbing aids shall be used. For
example, anti-climb paint, or barbed tape wrapped round scaffold poles, both applied not
less than 2.4 metres from ground level. Suitable warning signs must also be displayed
Scaffolding is only to be erected by firms who are registered members of the National
Association of Scaffolding Contractors
Attention is drawn to the Association’s Publications ‘Scaffolder’s and User’s Guide to Safe
Access Scaffolding’ and its recommendations therein or any amendments or substations
The works shall be undertaken by experienced and competent operatives and supervisors
The scaffold shall be capable of supporting the loads for which it is intended to be used,
including such allowances as necessary for wind loading
All scaffolding shall be rigidly connected with the building unless the scaffolding is so
designed and constructed as to ensure the stability without such connections. Aluminium
towers are to be used in accordance with the PASMA Code of Practice. Each scaffolding
standard shall be on its own sole plate which shall not run between standards or be shared
by other standards
Any surface off which the scaffold bears, e.g. turf/tarmac or paving slabs etc., is fully
protected and in the event of damage shall be reinstated to the complete satisfaction of the
Contract Administrator at the Contractors expense
Scaffold ties must be fixed as necessary during erection of the scaffold as each lift is
completed. Care should be taken to ensure the stability of the scaffolding during
dismantling.
The first ties shall be at or below fan level, in accordance with Regulation 15 of the
Construction (Working Process Regulations 1966). Every scaffold shall be connected to the
building or structure. Upon dismantling the contractor shall make good all scaffolding
connections with the building as each lift is dismantled by cutting out and replacing disturbed
areas of brickwork to match existing in gauged mortar
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 48
Job No
Section 2
Materials and Workmanship
A 2m high (Heras) self supporting fence or other similar fence with each section three times
clipped and bolted to its neighbour is to be erected 3 metres clear of the scaffold, without
damage to the paving or other finishes. This fence is to be erected at the same time as the
scaffolding. This fence should wherever possible run outside private gardens but include
returns to tightly abut doorways where there are no gardens
All scaffolding, fencing etc. may only be erected or dismantled when the common or
surrounding areas are cleared of occupants and members of the public. Similar precautions
are to be taken when mobile towers are used. The contractor shall ensure that his foreman
is consulted prior to commencement and is informed of any movement of scaffold/hoists etc.
and is advised when the erection is to begin and expected duration of the operation
The foreman shall supply this information, in writing to the Clerk of Works so that the period
in which these activities may be undertaken can be agreed and any temporary barriers
installed to maintain clearance of areas
Where doors/entrances/access ways occur, fans are to be provided which shall be of
adequate construction and additionally have unbroken sheeting which abuts the fabric of the
building and projects over the entrance way by minimum of 2m from the scaffold in order to
protect members of the public. All scaffold tubes are to be arranged so that full operation of
the doors is not impeded
If natural or artificial lighting is obscured then additional lighting shall be provided. No
scaffold tubes shall protrude into any access ways whether on or off scaffolding. Caps shall
be provided to protect the ends of the tubes.
All doors and windows shall remain openable at all times
Work is not to proceed until the Contract Administrator has agreed the working procedures.
The working procedures will cover such areas as:
Storage, restriction in working hours; restriction in buildings/communal areas use; protection,
planning of the works and communications with the Client
Where works are to undertaken above occupied areas, then full protection must be afforded
to the occupants or the areas below should be evacuated for the duration of these works
All scaffolds/towers, cradles, etc. are to be maintained in a safe condition. It is the
Contractor’s responsibility to inspect as required and sign the Statutory Registers within
the seven days immediately prior to their use and obtain a handover certificate from the
scaffolder
Working platforms should be adequately supported and fully boarded out; shall include the
provision of guardrails and tread boards, brick guards etc., together with extra sheeting out
or sealing of the working platform where demolition or similar types of operations are being
carried out
Ladders are to be adequately tied and access and ingress to them should be kept clear at all
times. Ladders at ground level should be removed at the end of each working day. Both
ladders and ropes to be secured out of reach of unauthorised persons generally
Satisfactory storage arrangements for scaffold tubes and fittings are to be agreed prior to
their arrival on site to ensure they are not strewn across the site
The electrical equipment on site is to be at or below 110 volts unless alternative protective
measures have been agreed with the Contract Administrator or Clerk of Works
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 49
Job No
Section 2
Materials and Workmanship
All elevations to the scaffold should be provided with 1m high plastic ‘Brick guard’ netting to
all scaffold levels
The contractor shall allow for and provide and exhibit in prominent positions, and adequate
number of warning notices, together with suitable warning tape, or temporary barriers which
shall be used in order to fence off certain areas while work is being carried out.
To the elevations adjacent to or over, facing walkways lighting to the scaffolding at ground
level must be provided during the hours of lighting up
To each elevation of each block, and located on random scaffold levels, the contractor shall
provide and erect 1 No. 150w PIR activated security light and 1 No dummy CCTV camera
with flashing LED light. To each scaffold elevation the light and dummy camera are to be
provided at different levels
Notwithstanding the above scaffolding shall comply with:
The Health and Safety at work etc. ACT 1974
The relevant sections of CP97 Part 2 and BS 5973/4
The requirements of the Construction (Working Places) Regulations 1966 and any other
statutory requirements appertaining at the time
The exact and full requirement of the Safety Officer representing The Local Authority

Only trained hoist drivers are to operate hoists from one position only, preferably at
the top level from an out rigger platform with good visibility to all landings, which
shall be provided

Under no circumstances shall any person be permitted to ride on the hoist

At the end of the working day the hoist motor and tower should be immobilised and
effectively secured

The hoist shall be inspected once a week and the necessary entry made in the lifting
apparatus section of the register (F91 Part 1). This also includes gin wheels used for
the raising and lowering of materials

Hoist platforms to be left at ground level at the end of each working day and the
gates locked

Test Certificates to be provided before the hoist is put into use and thereafter every
six months or after substantial movement of or repair
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 50
Job No
Section 2
Materials and Workmanship
15.2.
Scaffolding from lower roofs
If it is necessary to scaffold from a lower roof, the contractor should ensure that adequate
protection is provided to the roof coverings and the loads from the scaffolding are
adequately spread across the roof so as not to damage the roof surface or structure in any
way.
The contractor will be required to undertake a survey of the said areas with the Contract
Administrator prior to any scaffolding operations commencing. Similarly a photographic
record should be taken of the condition of the roof and that any damage caused to the roof
or balcony as a result of the works shall be made good at the contractor’s expense. The
contractor is to assess the roofs ability to sustain the proposed loads and also to make good
any damage at his own expense.
15.3.
Security
The security of the buildings is of high importance. The contractor shall take all reasonable
measures to ensure full security of the buildings during the course of the works.
The contractor is reminded that the site is occupied when works are to be undertaken. The
contractor shall therefore take every precaution to protect the occupiers and the general
public from any danger howsoever caused by the negligence of the contractor’s operatives
(including all sub-contractors) or acts of vandalism or wanton destruction. The protection to
the safety of the general public shall be at all times of paramount importance and the overriding factor of any building operation.
15.4.
Access
To the site via the main site entrance shall be determined by site requirements, i.e.,
pedestrian, and or vehicular etc., whenever possible it is preferred that a minimum number
of access points are constructed. For example, if vehicular access is frequent, then it may
not be necessary to construct a separate pedestrian entrance, unless for safety purposes
Gates for these purposes shall normally be constructed from the same materials as the
temporary security fence/barrier
15.5.
Locking
Shall be determined locally, but normally shall be achieved using a crop resistant chain (with
case hardened) link diameter of not less than 13mm), or a padlocking bar (fitted in
accordance with manufacturer’s instructions) compliant with the proposed CEN Class 6
Padlocking Bar Standard, and a close shackle padlock, compliant with the proposed CEN
Class 6 Padlock Standard
All site ladders giving access to the first ‘lift’ shall be removed or raised and locked. It is not
sufficient to tie a plank to the rungs. Other ladders (or climbable fence panels) held on site
shall be secured by crop resistant chain and close shackle padlock
All scaffold lifts (hoists) shall be raised above the security protected level(s) and
electronically isolated, or secured with a crop resistant chain and close shackle padlock
BUILDING SURVEYORS PREAMBLES (OCTOBER 2007)
Page No. 51
Job No
Section 2
Materials and Workmanship
15.6.
Installation
The fixing of fence panel to posts shall adopt normal practice, bearing in mind the need to
prevent easy removal by an intruder
All fence posts or their footplates shall be anchored to the ground, and the bottom gap
between the fence/barrier and hard ground shall be not greater than 150mm. Where site
undulation occurs, then additional fence panels shall be fitted to reduce any climb under or
over points
Boarding may be painted to suit any Local Authority requirements
15.7.
Scaffold Alarms
UBX 419 Electronic Scaffold System
15.7.1.
UBX Security Plc
153 Westbourne Grove
London W11 2RS
Tel: 020 7229 0999
Fax: 0207 792 4999
Introduction
The Product/system described in this specification shall be used to provide electronic
protection against an intruder, where scaffolding has been erected against the whole or part
of a building with direct public access, and wherever indirect public access is perceived as a
threat (e.g. BT site perimeter poor or damaged)
15.7.2.
Scope
This specification shall be applied normally to all operational buildings, and any non
operational buildings as necessary, where renovation, remedial or extension building works
require scaffolding to be erected, and where there is a serious threat of intrusion, leading to
crime
This specification normally shall be applied to all buildings requiring base, enhanced or high
security, during times when scaffolding has been erected at ground floor and above, plus
any other ad hoc scaffold arrangements or easy access points. For example, protruding
canopies, raised public walkways adjoining of close premises/structures.
This specification may also be used in high crime prone areas, where scaffolding is contained
within a secure perimeter
The application of this specification does not necessarily preclude the need for other security
measures, such as, on site-guards, patrols, portable alarms or temporary security fencing
Any local deviation resulting in less protection from the installers recommendation, shall be
subject of a written and signed record – copies to be held by both parties
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15.7.3.
Sensors
The alarm system sensors shall utilise a controlled invisible microwave energy field
technology, and shall be designed and use components for external application
The electromagnetic energy emitted by the sensors shall meet the requirements of the
Department of Trade and Industry (DTI), and comply with BS EN 61000-6-1: 1995, together
with pr ETX 330-683: 11-95 (Council Directive 891336IEEC), the European Electromagnetic
Compatibility Standard
The field of protection shall cover the scaffold, and shall detect only human intrusion,
climbing up or through boarded or unboarded scaffold. The sensor technology shall ignore
birds, cats and small animals
The performance of the sensor shall be capable of intruder detection up to 200 metres, and
the system shall be able to protect ends of scaffold runs, bays etc., but shall not penetrate
the building line, interfere with site equipment, or be adversely affected by normal
pedestrian or traffic movement, vibration, wind, falling leaves, debris, heavy rain, hail, fog,
ice, snow, dust, temperature extremes, or the scaffold work itself (poles, netting/sheeting
etc.)
The sensors and system shall be immune to Radio Frequency Interference (RFI)
The sensors, that is, the transmitting and receiving devices shall be contained in rugged
weatherproof enclosures, typically rated at not less than IP6.5 and shall have anti-tamper
protection during set and un-set periods, and shall not be capable of being masked
15.7.4.
System
All alarm activity events shall be recorded by the control equipment, which shall be situated
within a secure area on site
The control panel shall offer up to 12 zones, and normally shall include
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A 1000 event logger
A real time printer
24 volt power supply
Stand-by rechargeable battery (2, IAH)
External digital keypad with environmental protection of not less than IP6.6
Digital communicator
Self adjusting Automatic Gain control (AGC)
The control panel system shall provide the following
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Time, date and location on scaffold of a human intruder
Time, date and name of operator who set/un-set the system
The digital keypad (internal or external) the operator used
Details of the authorised operator, if he/she deliberately omits or by-passes any part
of the system, and which area(s) was omitted
Time, date and location of a tamper of sensor(s) (detector heads), cable or control
equipment
Details of whether the alarm system is set/un-set
Time and date of any power supply failure
Digital communications failure
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Materials and Workmanship
The system shall be capable of indicating any misalignment of the sensor devices or whether
an obstruction has been introduced
The system shall not cause an alarm if the air temperature remains between –20 degrees C
and +50 degrees C
In the event of human intrusion, the system shall operate a local sounder, strobe light, and if
required, an interface to switch on local permanent or temporary lighting. Also, the system
shall be capable of sending a telecommunication signal to a predetermined Alarm Receiving
Centre (ARC), or the site owner (Customer), or maintenance provider. The capability of
diverse signalling is also a requirement
The system shall have back-up power supply for at least 36 hours, and shall provide initially,
local and then remote annunciation
15.7.5.
Sounder
The local sounder and strobe light, normally, shall be housed in a polycarbonate enclosure,
with environmental protection of not less than 1P6.7, and shall be bolted to the scaffold at a
naturally inaccessible but prominent point, normally, of not less than 4 metres high. The
number of sounders to be determined at survey for best impact
Any tampering with the sounder or its wiring, shall result in the operation of the sounder(s)
by means of an independent internal battery
The sounder shall be capable of producing sounds at 120db at 1 metre, and shall not
normally sound for longer than 20 minutes before automatically re-setting
Alarm system warning signs, normally, shall be displayed
15.7.6.
Maintenance
In the event of system faults or alarm actuation, then fault-dealing or alarm re-setting
response from the installing company or its representatives normally, shall be 1 hour within
most metropolitan areas
Cover/response shall be available nationwide but where it is unreasonable to provide 1 hour
the response then local negotiation shall determine a meaningful and agreeable response
time
15.7.7.
Installation
The sensors shall be fitted on dedicated cantilever scaffold poles outside the face of the
scaffold, normally at the first lift, or at any other accessible levels/lifts
The alarm system normally shall be installed as scaffold is erected
The control equipment shall be housed in a secure enclosure with in the secure area
The system sensors may also be sited at ground level behind any site barrier (fence,
boarding etc.) but shall require a minimum area width, normally, of not less than 2 metres
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Materials and Workmanship
15.7.8.
CCTV Monitoring
The site may be guarded in addition to this specification. Refer to Schedule for clarification if
applicable:The system shall be capable of interfacing with local or dedicated CCTV systems, in which
latter case, the alarm system shall provide the usual audio/visual annunciation to the
monitoring staff
The option of CCTV is particularly important, when Police response is required. Other
technologies offering a double-knock system are normally not approved
The ability to link additional scaffold camera(s) into an existing site CCTV system shall be
required on occasions. This being so, liaison shall be set up with local monitoring services,
and the Police
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