12/05/14
DESIGN NO. ________
8
1
SECTION 04435
CAST STONE
PART 1 - GENERAL
1.01 DESCRIPTION OF WORK
A.
The Work of this Section includes all labor, materials,
equipment and services necessary to:
Provide cast stone copings, bandings, window sills,
windows surrounds and all other cast stone features and
accessories as indicated on Drawings, specified herein,
and as needed for a complete and proper installation.
4
1
1.02 SUSTAINABILITY REQUIREMENTS
A.
The Contractor shall implement practices and procedures
to meet the Project’s sustainable requirements. The
Contractor shall ensure that the requirements related to
these goals, as defined in Specification Section S01352,
Sustainability Requirements, and as specified in this
Section, are implemented to the fullest extent.
Substitutions or other changes to the work shall not be
proposed by the Contractor or their sub-contractors if
such changes compromise the stated Sustainable Design
Performance Criteria.
B.
Sustainability requirements included in the Section are
as follows:
1.
Documentation of Regional materials.
1.03 REFERENCES
A.
References and industry standards listed in this Section
are applicable to the Work.
Unless more restrictive
criteria or differing requirements are explicitly stated
in the Specifications, or mandated by governing codes or
regulations, the recommendations, suggestions, and
requirements described in the referenced standards shall
be deemed mandatory and applicable to the Work.
B.
American Concrete Institute (ACI).
C.
Concrete Reinforcing Steel Institute (CRSI).
D.
Precast Concrete Institute (PCI).
E.
American Society for Testing and Materials (ASTM).
NYCSCA
CAST STONE 04435 - 1
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DESIGN NO. ________
1.04 SUBMITTALS
A.
B.
Product Data
1.
Materials list of items proposed to be provided
under this Section.
2.
Manufacturer's specifications and other data needed
to
prove
compliance
with
the
specified
requirements.
Shop Drawings
1.
Shop Drawings showing complete information for
fabrication and erection of the Work of this
Section, including, but not limited to:
a.
Show fabrication and installation details for
cast stone. Include dimensions and cross
sections; details, locations, size, and type
of reinforcement and anchorages, including
special reinforcement and lifting devices
necessary for handling and erection. Indicate
finished faces.
Include plans and building elevations showing
layout of units and locations of joints and
anchors.
C.
Erection procedures, sequence of erection, and
required handling equipment.
c.
Layout, dimensions, and identification of each
precast unit corresponding to the sequence and
procedure of installation.
d.
Details of inserts, connections, and joints,
including accessories.
e.
Location and details of anchorage devices that
are to be embedded in other construction.
Samples: Review of samples by the Authority will be for
color, texture, and general condition only. Compliance
with
all
other
requirements
is
the
exclusive
responsibility of the Contractor.
1.
NYCSCA
b.
Cast
Stone:
Submit
3
cast
stone
samples
approximately 12" x 12" x 4", showing quality,
texture, and color of the proposed finish.
CAST STONE 04435 - 2
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D.
DESIGN NO. ________
2.
Samples for Initial Selection of Mortar Color:
Submit the full range of colors available. Where
mortar color is to match existing, provide proposed
colors.
3.
Samples for Verification of Mortar Color: For each
mortar color required, submit the full range
expected in the finished construction. Make samples
using the same ingredients to be used on Project.
Label samples to indicate type and amount of
colorant used.
4.
Submit 3 samples each of anchorages
attachments and accessories.
5.
Full Size Cast Stone Samples: Prior to start of
installation, and after the review of finish
Samples, submit one full size Sample of each shape
of required cast stone unit, delivered to the job
site. Acceptable full size samples may be
incorporated in the construction.
other
Quality Control Submittals
1.
Laboratory
tests
reports,
by
a
qualified
independent testing laboratory, as specified in
Article titled “Source Quality Control”; or Precast
Concrete Institute (PCI) or Cast Stone Institute
(CSI) certification.
a.
2.
Source Quality Control testing will be waived
if the casting plant is PCI or CSI certified.
Submit documentation of PCI or CSI Plant
Certification Program in order to obtain a
written waiver from the Authority, and include
copies of material test reports for completed
projects indicating compliance of cast stone
with ASTM C1364 performed within the past
year.
Certificates:
a.
NYCSCA
and
Statements
that
manufacturer,
installer,
adhesive anchor installer and test laboratory
have the specified qualifications.
Include
lists of completed projects with project names
and
addresses,
names
and
addresses
of
architects and owners, and other information
specified.
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DESIGN NO. ________
3.
E.
b.
Statements
that
cast
stone
and
mortar
materials meet the single source requirements
indicated under “Quality Control”.
c.
Certification that air-entraining admixture is
compatible with other admixtures used by the
admixture manufacturer.
Field quality control test samples, if required.
Mock-up
In accordance with Article titled Quality Assurance.
4
1
F.
Sustainable Submittals
1.
Submit Contractor’s Sustainable Materials Form with
complete information on regional content for cast
stone provided under the work of this section in
accordance with Section G01352, Sustainability
Requirements. Include cost of all cast stone
materials and distance in miles to point of
materials extraction and manufacture.
2.
Submit documentation of regional materials –
product
data,
mix
design
information,
or
manufacturer’s statement.
1.05 QUALITY ASSURANCE
A.
NYCSCA
Qualifications
1.
Installer: A firm with at least 3 years experience
in installing cast stone units of a type and
quantity
similar to those indicated for this
Project. Use adequate numbers of skilled workman
who are thoroughly trained and experienced in the
necessary crafts and who are completely familiar
with the specified requirements and the methods
needed for proper performance of the Work of this
Section.
2.
Manufacturer:
A
supplier
experienced
in
manufacturing cast stone units similar to those
indicated for this Project and with a record of
successful in-service performance, as well as
sufficient production capacity to manufacture
required units.
CAST STONE 04435 - 4
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B.
C.
DESIGN NO. ________
3.
Testing
Laboratory:
An
independent
testing
laboratory qualified according to ASTM E329 to
conduct the testing specified, as documented
according to ASTM E548.
4.
Adhesive Anchor Installer: Installer for adhesive
anchors installed in concrete in a horizontal or
upwardly inclined position supporting sustained
tension loads shall be certified per ACI Appendix
D9.2.2 as per Section BC 1912 of the 2014 NYC
Building Code.
Regulatory Requirements
1.
Building Code: Work of this Section shall conform
to all requirements of the NYC Building Code and
all
applicable
regulations
of
governmental
authorities having jurisdiction, including safety,
health, noise, and anti-pollution regulations.
Where more severe requirements than those contained
in the Building Code are given in this Section, the
requirements of this Section shall govern.
2.
NYC Board of Standards and Appeals (BSA) approvals,
NYC Materials and Equipment Acceptance (MEA)
approvals or Office of Technical Certification and
Research (OTCR).
Certifications
Masonry construction shall conform to the material
acceptance, certification and inspection requirements of
Section BC 1701 of the 2014 NYC Building Code.
D.
NYCSCA
Source Quality Control
1.
Source Limitations for Cast Stone:
Obtain cast
stone units through one source from a single
manufacturer.
2.
Source Limitations for Mortar Materials:
Obtain
mortar ingredients of a uniform quality, including
color, from one manufacturer for each cementitious
component and from one source or producer for each
aggregate.
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E.
DESIGN NO. ________
Mockups
1.
Construct sample panels to conform to appearance
and workmanship as indicated in the Drawings and
Specifications.
2.
Use approved sample panels for a standard of
comparison for the Project. All Work shall conform
in workmanship and appearance to that of the
approved samples.
3.
If not approved, remove panel and install new panel
(or panels), repeating the process until panel is
approved.
4.
Do not proceed with Work until panels are approved
in writing by the Project Architect/Engineer.
1.06 DELIVERY, STORAGE AND HANDLING
A.
Deliver the Work of this Section to the job site in such
quantities and at such times as to assure the continuity
of construction; carefully pack or crate to prevent
damage.
B.
Store units at the job site in a manner to prevent
cracking, distortion, warping, staining, and other
physical damage, and in a manner to keep markings
visible.
C.
Lift and support the units only at designated lifting
points or supporting points as shown on the approved Shop
Drawings.
D.
Any units
replaced.
E.
Patching of units will not be acceptable.
F.
Pack, handle, and ship cast stone units in suitable packs
or pallets.
NYCSCA
damaged
before
final
acceptance
shall
be
1.
Lift with wide-belt slings; do not use wire rope or
ropes that might cause staining. Move cast stone
units, if required, using dollies with wood
supports.
2.
Store cast stone units on wood skids or pallets
with non-staining, waterproof covers. Arrange to
distribute weight evenly and to prevent damage to
CAST STONE 04435 - 6
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DESIGN NO. ________
units.
Ventilate
condensation.
under
covers
to
prevent
G.
Store installation materials on elevated platforms, under
cover, and in a dry location.
H.
Store mortar aggregates where grading and other required
characteristics can be maintained and contamination
avoided.
1.07 ENVIRONMENTAL REQUIREMENTS
A.
B.
Cold Weather Construction Requirements
1.
Per Section BC 2104.3, cold weather construction
provisions of TMS 602/ACI 530.1/ASCE 6 Article 1.8C
shall be implemented when either the ambient
temperature falls below 40°F or the temperature of
masonry units is below 40°F.
2.
Salt or other chemicals for lowering the freezing
temperature of the mortar shall not be used.
Hot Weather Construction Requirements
Per the requirements of Section BC 2104.4, hot weather
construction provisions of TMS 602/ACI 530.1/ASCE 6
Article 1.8D shall be implemented when temperatures
exceed 100°F, or 90°F with a wind velocity greater than 8
mph.
PART 2 - PRODUCT
2.01 MATERIALS
A.
NYCSCA
Cast Stone
1.
Portland Cement:
ASTM C150, Type I, white,
containing not more than 0.60 percent total alkali
when tested according to ASTM C114.
2.
Coarse Aggregates: Granite, quartz, or limestone
complying with ASTM C33; gradation as needed to
produce required textures.
Used for wet mix
process.
3.
Fine Aggregates:
Manufactured or natural sands
complying with ASTM C33, gradation as needed to
produce required textures.
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DESIGN NO. ________
4.
Coloring Admixture for Cast Stone: ASTM C979,
synthetic mineral-oxide pigments or colored waterreducing admixtures, temperature stable, nonfading, and alkali resistant.
5.
Water: Shall be clean potable water
injurious
foreign
matter
conforming
requirements of Section BC 1903.4.
6.
Air-Entraining Admixture:
the manufacturer to be
admixtures used.
a.
NYCSCA
Add to wet-cast process mixes for units
exposed to the exterior at manufacturer's
prescribed rate to result in an air content of
5 to 7 percent. For dry-cast process mixes,
it is required if needed to meet the freezethaw resistance criteria.
Other Admixtures: ASTM C494.
8.
Reinforcement: Deformed steel bars complying with
ASTM A615/A615M.
9.
B.
ASTM C260, certified by
compatible with other
7.
a.
6
free of
to
the
Epoxy Coating:
ASTM A775/A775M.
Inserts: Fabricated from stainless steel complying
with ASTM A276 or ASTM A666, Type 304.
Anchors:
1.
Eye rods: Type 304 stainless steel complying with
ASTM A276.
2.
Pins/Dowels: Round stainless-steel bars complying
with ASTM A276, Type 304, 1/2-inch diameter.
3.
Strap Anchors for building with back-up wall or
welding to existing steel:
1/8" thick minimum
stainless steel, Type 304 conforming to ASTM A240.
See Drawings for sizes and shapes.
4.
Rod Anchors for attaching into masonry are to be
Type 304 stainless steel adhesive type with screen:
a.
Hilti HY 70
b.
ITW Red Head C6+
c.
Powers Fasteners AC100+Gold
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DESIGN NO. ________
5.
6.
C.
2
Rod Anchors for attaching into concrete are to be
Type 304 stainless steel adhesive type. Adhesive
anchors in concrete shall have an ICC-ES Evaluation
Service report (ESR) issued in accordance with
ACI 355.4 or ICC-ES AC 308 for use in cracked
concrete, including seismic applicability loading,
and
pursuant
to
the
Office
of
Technical
Certification and Research (OTCR) Building Bulletin
2014-018.
Anchors installed in grouted masonry
shall have a report issued in accordance with AC 58:
a.
Hilti HY 200
b.
ITW Red Head C6+
c.
Powers Fasteners AC100+Gold
Electrode for Welding to Stainless Steel to carbon
steel:
E309-16.
Keep electrode dry.
Oven dry
electrode after exposing it for more than 6 hours.
Mortar
1.
Portland Cement: ASTM C150, Type I or II, except
Type III may be used for cold-weather construction.
Provide natural color, white, or a blend to
produce mortar color indicated.
2.
Hydrated Lime:
3.
Mortar Aggregate:
a.
ASTM C144.
White-Mortar Aggregates:
or ground, white stone.
Natural, white sand
4.
Mortar Coloring:
Provide pure mineral pigments,
natural and synthetic iron oxides, and chromium
oxides compounded for use in mortar mixes.
Material shall conform to ASTM C979. Coloring shall
not contain alkalyde salts. No liquid colorants
shall be permitted. Use only pigments with record
of satisfactory performance in masonry mortars.
5.
Water: Shall be clean potable water
injurious
foreign
matter
conforming
requirements of Section BC 1903.4.
3
NYCSCA
ASTM C207, Type S.
free of
to
the
CAST STONE 04435 - 9
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D.
DESIGN NO. ________
Accessories
1.
Job-Mixed Detergent Solution: Solution of 1/2 cup
(125 mL) of dry-measure tetrasodium polyphosphate
and 1/2 cup (125 mL) of dry-measure laundry
detergent dissolved in 1 gal. (4 L) of water.
2.
Sealant
a.
Sealant as specified in Section 07900 - Joint
Sealers, as applicable for vertical joints and
for horizontal joints.
b.
Bond breaker tape as specified in Section
07900 - Joint Sealers.
2.02 CAST STONE UNIT FABRICATION
A.
Provide cast stone units complying with ASTM C1364.
1.
Compressive Strength: At 28 days after manufacture,
not less than 6500 psi, when tested in accordance
with Test Method ASTM C1194.
2.
Absorption,
Cold
Water:
At
28
days
after
manufacture, not greater than 6%, when tested in
accordance with Method A, Cold Water of Test Method
ASTM C1195.
3.
Absorption,
Hot
Water:
At
28
days
after
manufacture, not greater than 10%, when tested in
accordance with Method B, Boiling Water Test of
Test Method ASTM C1195.
4.
Provide units that are resistant to freezing and
thawing as determined by laboratory testing
according to ASTM C666, Procedure A, as modified by
ASTM C1364.
B.
Colors and Textures
1
1.
________________.
2.
Color shall be uniform for each unit and consistent
for all units.
NYCSCA
CAST STONE 04435 - 10
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C.
DESIGN NO. ________
Fabrication
1.
7
2.
NYCSCA
General
a.
Fabricate the Work of this Section to the
sizes and shapes indicated, and of texture
matching the approved Samples.
b.
Provide finished units that are straight, true
to size and shape, and within the specified
casting tolerances.
c.
Make exposed edges sharp, straight, and
square, unless indicated otherwise. Make flat
surfaces into a true plane.
d.
Warped, cracked, broken, spalled, stained,
surface crazed, and otherwise defective units
will not be acceptable.
e.
Place and secure in the forms all anchors,
clips, stud bolts, inserts, lifting devices,
shear ties, and other devices required for
handling and installing the precast units and
for
attachment
of
subsequent
items
as
indicated or specified.
f.
Field measure existing units and produce molds
from existing units to replicate work. Based
on these, create shop drawings and molds.
Joint widths are to be 1/4" minimum if
existing is less than 1/4" and 3/8” maximum if
joints are equal to or greater than 3/8”.
g.
Reinforce units as indicated and as required
by ASTM C1364. Use epoxy-coated reinforcement.
Fabricate units with sharp arris and details
accurately reproduced with indicated texture on all
exposed surfaces, unless otherwise indicated. Match
existing units in texture, color and shape where
units are being replaced. Take all molds as
necessary.
a.
Slope exposed horizontal surfaces at least
1:12, unless otherwise indicated.
b.
Provide raised fillets at backs of sills and
at ends indicated to be built into jambs.
c.
Provide drips on projecting elements, unless
otherwise indicated.
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DESIGN NO. ________
3.
Casting tolerances
Maintain casting, bowing, warping, and dimension
tolerance below the following maximums:
4.
a.
Overall dimension for height and width of
units:
Plus zero, and minus 1/16" of unit length.
b.
Make thickness of units plus or minus 1/8"
maximum.
c.
Bowing or warping:
length.
d.
Insert locations: Place within plus or minus
1/4" in each direction.
Do not exceed 1/360 of the
Cure and finish units as follows:
a.
Cure units in totally enclosed curing room
under dense fog and water spray at 95 percent
relative humidity for a minimum of 24 hours.
Follow PCI recommendations.
b.
Yard cure units until the sum of the mean
daily temperatures for each day equals or
exceeds 350˚F.
c.
Acid etch units to remove cement film from
surfaces indicated to be finished.
2.03 MORTAR MIXES
A.
Setting Mortar
1.
Shall conform to ASTM C270 and BIA M1-88. Provide
Type I Portland cement. Masonry cement shall not be
used as a substitute. Preconstruction testing with
the proportions carefully monitored is to be used
to establish the upper end of the strength range,
which should generally be near the minimum strength
of the next higher strength mortar.
a.
NYCSCA
Mortar shall be Type S: 1 part white cement,
1/2 part lime, 41/2 parts dry sand. Minimum
compressive strength shall be 1800 psi at 28
days.
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3
DESIGN NO. ________
2.
Mortar Color:
Proportion mortar coloring with
other mortar mix ingredients to obtain desired
color, as approved by the Project Architect. Do
not exceed 1 part pigment to 10 parts cement, by
weight.
If consistent color cannot be obtained,
provide as a minimum premixed Portland cement and
coloring from major cement manufacturer.
2.04 SOURCE QUALITY CONTROL
5
A.
The Authority will assign a Special Inspector who will
inspect the masonry construction under the requirements
of Section BC 1704.5.
B.
Employ an independent testing agency to sample and test
cast stone according to ASTM C1364 and the specific test
methods specified in Article titled “Cast Stone Units”.
Include testing for:
1.
Compressive Strength in accordance with Test Method
ASTM C1194. Test units from each 500 ft3 of cast
stone.
2.
Absorption, Cold Water and Hot Water, in accordance
with Test Method ASTM C1195. Test units from each
500 ft3 of cast stone.
3.
Resistance to Freezing and Thawing in accordance
with Test Method ASTM C666, Procedure A. Test one
unit from each cast stone mixture design.
C.
If test specimens fail, the specimens and the entire
500 ft3 lot they came from shall be rejected and shall
not be used in the project.
D.
The requirements for Source Quality Control testing will
be waived by the Authority if the casting plant is PCI or
CSI Certified.
See Article titled “Submittals” for
certification and other submittals required.
PART 3 - EXECUTION
3.01 EXAMINATION
A.
NYCSCA
Examine substrates and conditions, with installer
present,
for
compliance
with
requirements
for
installation tolerances and other conditions affecting
performance of cast stone.
CAST STONE 04435 - 13
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B.
DESIGN NO. ________
Proceed with installation only
conditions have been corrected.
after
unsatisfactory
3.02 PROTECTION
A.
Cover top of masonry wall with waterproof plastic
membrane at the end of the work period, when work is not
in progress, and at other times when Work needs to be
protected from rain and other precipitation.
Extend
cover down sides as needed to thoroughly protect the
Work.
B.
During cold weather, do not use wet masonry units and
frozen masonry units.
C.
Do not use frozen materials or lay masonry on frozen
materials; remove frozen materials from wall. Refer to
Part 1 of this Section, "Environmental Requirements" for
temperature restrictions.
D.
Remove excess mortar from walls as soon after laying
units as practicable to prevent staining and to
facilitate cleaning of wall.
E.
Brace walls as needed until sufficiently set, or until
intersecting walls provide lateral support.
F.
Prevent masonry cleaners from coming in contact with
adjacent glass, metal, and other masonry surfaces such as
cast stone. Protect adjoining glass and metal surfaces
and all other adjacent materials and property from
masonry operations.
3.03 MIXING PROCEDURES FOR MORTAR
A.
Measure material by volume or equivalent weight. In
measuring by volume, measure ingredients by container. Do
not measure by shovel.
B.
Mix ingredients in a clean mechanical mixer for a minimum
of 3 minutes, maximum of 5, with the minimum amount of
water to produce a workable consistency.
C.
Mortar that has stiffened because of evaporation of water
from the mortar may be retempered only once, and only
during the first hour of placement to restore the
required consistency. Mortar shall be used within 21/2
hours after initial mixing.
Limit amount of mortar
batched at one time to stay within these requirements.
NYCSCA
CAST STONE 04435 - 14
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DESIGN NO. ________
3.04 INSTALLATION
A.
Coordinate as required with other trades to assure proper
and adequate accommodation with the Work of this Section.
B.
Set cast stone as indicated on Drawings.
Install
anchors, supports, fasteners, and other attachments
indicated or necessary to secure units in place. Set
units accurately in locations indicated with edges and
faces aligned according to established relationships and
indicated tolerances.
C.
Drench units with clear water just before setting.
D.
Set units in full bed of mortar with full head joints,
unless otherwise indicated. Build anchors and ties into
mortar joints as units are set. Anchors to be set in
substrate with non-shrink grout.
1.
Coping Stone: Set 3/8" of mortar prior to
installation of flashing providing full bed. Rake
joint 3/8” to allow for bondbreaker tape and
sealant installation. Seal flashing penetrations
with sealant. Install another 3/8" mortar on top
of flashing and place stone. Provide full bed of
mortar and tool joint. After stones are set and
mortar cured, install bond breaker tape and sealant
under the flashing.
2.
Fill dowel holes and anchor slots with mortar.
3.
Fill collar joint solid as units are set.
4.
Build concealed flashing into mortar joints as
units are set.
E.
After units are set in or on the wall they shall have all
top surfaces covered and protected from the elements at
the close of each day's work and shall be kept covered
and protected until all the Work is completed.
F.
Lead, Plastic or hard rubber buttons shall be used in
setting large units to sustain the weight until mortar
has set.
G.
All joints between units shall be raked out 3/8" deep and
shall be filled with joint sealer, (after bond breaker
tape) as specified in Article titled “Accessories”.
NYCSCA
CAST STONE 04435 - 15
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H.
DESIGN NO. ________
Expansion Joints
Provide expansion, control, and pressure-relieving joints
of widths and at locations indicated.
Provide expansion joints at a maximum spacing of
approximately 40 feet on center. Match joint spacing with
parapet expansion joints.
Provide filler seal, bond breaker tape, and joint sealers
at expansion joints where indicated on the Drawings and
where required for proper installation. (See Section
07900 Joint Sealers).
Keep joints free of mortar and other rigid materials.
I.
Discrepancies
1.
Immediately notify Authority's Representative.
2.
Do not proceed until fully corrected.
3.05 INSTALLATION TOLERANCES
A.
Variation from Plumb: Do not exceed 1/8 inch in 10 feet
(3 mm in 3 m) or 1/4 inch in 20 feet (6 mm in 6 m) or
more.
B.
Variation from Level: Do not exceed 1/8 inch in 10 feet
(3 mm in 3 m), 1/4 inch in 20 feet (6 mm in 6 m), or 3/8
inch (9 mm) maximum.
C.
Variation in Joint Width: Do not vary joint thickness
more than 1/8 inch in 36 inches (3 mm in 900 mm) or onefourth of nominal joint width, whichever is less.
D.
Variation in Plane between Adjacent Surfaces (Lipping):
Do not exceed 1/16-inch (1.5-mm) difference between
planes of adjacent units or adjacent surfaces indicated
to be flush with units.
3.06 FIELD QUALITY CONTROL
5
A.
NYCSCA
The Authority will assign under the requirements of
Section BC 1704.5 a Special Inspector who will inspect
the masonry construction.
Post installed anchors are
subject to Special Inspection as per Section BC 1704.32.
Adhesive anchors installed in concrete in a horizontal
or upwardly inclined position supporting sustained
tension loads shall be installed under continuous Special
Inspection as required by paragraph D9.2.4 of ACI 318-11.
CAST STONE 04435 - 16
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DESIGN NO. ________
If the masonry work is not designated for Special
Inspection, the masonry work will be subject to Quality
Control Inspection, with testing and inspection similar
to that listed below for Special Inspection. Inspections
performed by the Authority do not relieve the Contractor
of its obligation to conform to all requirements
specified in this Section.
B.
The Special Inspector will make inspections and any
testing deemed necessary. Mortar suspected or tested to
be too strong or too weak will be subject to petrographic
analysis or other methods deemed necessary by the
Engineer of Record and Special Inspector. The Contractor
shall pay for all tests if they verify improper work.
Inspections will include, but not be limited to, the
following:
1.
Proper installation of reinforcement and placement
of stone on angles.
2.
Proper
installation
of
mortar,
including
proportioning and mixing. Those mortar properties
listed in the Appendix of ASTM C780 are to be tested
at the discretion of the Special Inspector or the
Architect/Engineer of Record Mortar strengths, when
tested, will be determined in accordance with ASTM
C780 using cylinders.
3.
Proper installation of weeps, flashing, drip edges,
etc.
4.
At solid masonry construction, all bed, head, and
collar joints are filled completely.
For cavity
wall construction, all bed and head joints are
filled completely.
C.
The Architect or Engineer of Record will analyze any
results not found to be in conformance with the applicable
ASTM standard, industry practice, and the Specifications
and determine if the work in question is to be removed and
redone.
D.
Cooperate with the Special Inspector and the Testing
Laboratory performing Special Inspection testing.
E.
If there is evidence that the strength of cast stone
units may be deficient or may not comply with the
specified requirements, the Authority will employ an
independent testing laboratory to obtain, prepare, and
test cores drilled from hardened cast stone units to
determine
the
compressive
strength
according
to
ASTM C 42. Include in the bid, a minimum of 3 units to be
NYCSCA
CAST STONE 04435 - 17
12/05/14
DESIGN NO. ________
field tested and destroyed. If the units are found to be
defective, other units will be tested and replaced at no
cost to the Authority.
F.
NYCSCA
1.
Allow the Authority's testing laboratory access to
material
storage
areas.
Cooperate
with
the
Authority's testing laboratory and provide samples
of materials and concrete mixes as may be requested
for testing and evaluation.
2.
A minimum of three representative cores will be
taken from units of suspect strength, from
locations directed by the Authority.
3.
Cores will be tested in an air-dry condition.
4.
The strength of the cast stone for each series of 3
cores will be considered satisfactory if the
average compressive strength is equal to at least
85 percent of the 28-day design compressive
strength and no single core is less than 75 percent
of the 28-day design compressive strength.
a.
Test results will be made in writing on the
same day that tests are performed, with copies
to Authority, Contractor, and cast stone
fabricator. Test reports will include the
following:
b.
Project identification name and number.
c.
Date when tests were performed.
d.
Name of cast stone fabricator.
e.
Name of testing laboratory.
f.
Identification letter, name, and type of cast
stone unit or units represented by core tests;
design compressive strength; type of break;
compressive strength at breaks, corrected for
length-diameter ratio; and direction of
applied load to core in relation to horizontal
plane of cast stone as placed.
Defective Work: Cast Stone units that do not comply with
the specified requirements, including compressive
strength, manufacturing tolerances, and finishes, are
unacceptable. The Contractor shall remove and replace
defective Work with cast stone units that comply with the
specified requirements at no cost to the Authority.
CAST STONE 04435 - 18
12/05/14
G.
DESIGN NO. ________
Additional testing, at Contractor's expense, will be
performed by the Authority's testing laboratory to
determine compliance of corrected Work with specified
requirements.
3.07 ADJUSTING AND CLEANING
A.
Remove and replace stained and otherwise damaged units
and units not matching approved Samples.
B.
Replace units in a manner that results in cast stone
matching
approved
Samples,
complying
with
other
requirements, and showing no evidence of replacement.
C.
In-Progress Cleaning:
Clean cast stone as work
progresses. Remove mortar fins and smears before tooling
joints.
D.
Final Cleaning:
After mortar is thoroughly set and
cured, and after completion of other work liable to
damage or soil cast stone units, clean exposed cast stone
as follows:
1.
Remove large mortar particles by hand with wooden
paddles and nonmetallic scrape hoes or chisels.
2.
Protect adjacent surfaces from contact with cleaner
by covering them with liquid strippable masking
agent, polyethylene film, or waterproof masking
tape.
3.
Clean in conjunction with the cleaning of all other
masonry work. Do not clean in temperature below 50
degrees F. Clean by scrubbing with soap powder and
water, applied vigorously with stiff fiber brushes,
adding clean, sharp, fine, white sand to the soap
and water mixture where necessary. After scrubbing,
drench all surfaces of the cast stone units
thoroughly with clean water. The use of sand blast,
wire brushes; or acids of any kind will not be
permitted under any circumstances for the cleaning
of cast stone Work. Start the cleaning operation at
the top of the structure and proceed downward.
Perform a mock-up of the cleaning procedure.
END OF SECTION
HB:AG:GR:MF:mf:as
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CAST STONE 04435 - 19
12/05/14
DESIGN NO. ________
Notes to Specifier (Delete from Specifications)
1.
Specify type of finish. Choose one of the finishes listed
below or modify as required and include in Art. 2.02, Par. B.
"1.
Provide multiple colors and textures as required to match
existing units."
"1.
As selected by Project Architect from manufacturer's full
range for colors and textures."
"1.
Provide units with fine-grained texture and buff color
resembling Indiana limestone."
2.
If colored cast stone is used, specify colored mortar.
3.
Delete if pigmented mortar is not required.
4.
Omit for projects where compliance with NYC Green Schools
Rating System is not required (Typical of CIP projects).
Verify for referenced project.
5.
The designer should verify whether Special Inspection is
required for the stone work on the Project. If not, specify
Quality Control Inspection.
6.
Edit anchorage to suit depending on whether for new
construction or for existing construction. The designer is to
determine beforehand whether Type 316 is required due to
corrosive conditions and make revisions. For each project,
one of the manufacturers should be asked during the design to
determine the appropriate anchor based on pull tests.
7.
Delete note if new construction.
8.
This section is generally based on the installation of coping
stones and small installations of stone bands.
If used in
panels or long runs in the façade, ensure expansion joint
locations and reinforcement meets NCMA requirements and takes
into account locations of reentrant corners. Locate anchorage
appropriately to reduce restrained shrinkage.
Cast stone
behaves differently than masonry and must be detailed
appropriately taking into account differences in material
including coefficients of expansion. Detail coping stone such
that joints line up with brick joints in parapets. Typical
spacing of expansion joints to be 30 to 40 feet maximum.
* * *
NYCSCA
CAST STONE 04435 - 20
12/05/14
DESIGN NO. ________
LIST OF SUBMITTALS
SUBMITTAL
DATE SUBMITTED DATE APPROVED
Product Data:
______________ _____________
1. Materials list.
2. Manufacturer's specifications
& material data.
Shop Drawings:
______________
_____________
Samples:
1. Cast stone samples,
size 12"x 12" x 4".
2. Mortar colors for initial
selection.
3. Mortar colors for verification
4. Anchors, attachments,
accessories.
5. Full size samples.
Quality Control Submittals:
______________ _____________
1. Source Quality Control
laboratory test reports;
or PCI/CSI Certification.
2. Qualifications of installer,
manufacturer, adhesive anchor
installer, test lab.
3. Material single source qualification
For cast stone and mortar
4. Admixture compatibility certification
5. Field Quality Control
Testing (if required)
4
1
Mock Up:
_____________
Sustainability:
_____________
1.
2.
Contractor’s Sustainable
Materials Form (see Section
S01352).
Mfr’s printed literature or
statement on regionally extracted
and manufactured material content.
* * *
NYCSCA
CAST STONE 04435 - 21