WATERPROOFING
OF DOMESTIC WET AREAS
AS 3740 – 2010
Compliance &
Inspections
½ Day Course
BCA Requirements
Building Code of Australia ( BCA )
reference AS 3740 – 2010 and
Amendment 1 – 2012 as the
technical Deemed to Satisfy
building solution.
BCA and AS3740 are minimum
mandatory requirements.
BCA Table 3.8.1.1 and AS 3740
Table C1 provide waterproof and
water resistant requirements for
designated wet areas.
BCA Requirements
Waterproof Material
− A material that is
impervious to
moisture
Water Resistant
Material
− A material that will
not deteriorate when
exposed to moisture
The 2 Things
Performance requirements by BCA Vol 1 FP 1.6 and
Vol 2 P 2.4.1
Class 1 to 10
“To protect the structure of the building and to maintain the
amenity of the occupants, water must be prevented from penetrating
a)
behind fittings and linings; or
b)
into concealed spaces of sanitary facilities, bathrooms,
laundries and the like”
Class 2 to 9 “Overflow…must be prevented from penetrating to – another
sole occupancy unit… - public areas…in a storey below in the same
building.”
KEEP WATER CONTAINED
WITHIN THE DESIGNATED
WET AREA !
.
BCA Compliance
Designated Wet
Areas ( Table C1 )
− Shower – High Risk
− Bathroom, Ensuite –
Medium Risk
− Laundry, Laundrette,
W/C – Low Risk
THE 2 THINGS
AS 3740 – 2010 Section 2 lists
− Waterproof & Water Resistant Substrates
− Waterproof & Water Resistant Linings
Compliant substrate and surface lining materials
must be used in combination.
USE ONLY COMPLIANT
WATERPROOF & WATER
RESISTANT MATERIALS IN
WET AREAS !!
Materials in Combination
Lamipanel on non-compliant
W/R Board installation
WR Board exposed
AS 3740 – 2.4 Compliant Materials
Compliant Materials
 Substrate
o
o
o
o
o
o
Concrete
Compressed F/C sheeting
Render ( with WP additive)
Masonry
WR plasterboard (W Proofed)
Structural timber floor
( W Proofed)
 Lining
o
o
o
o
Thermoset laminated sheeting &
pre-decorated f/c sheeting
Tiles ( ceramic, stone, composite)
Welded sheet vinyl
Sanitary grade acrylic wall linings
Non-Compliant Materials
Non – compliant materials
Plaster setting/topping
−
−
−
no setting or joint fixing in high risk areas
waterproof horizontal joints/external corners.
seal all mechanical fixings.
Timber door/window reveals & mouldings
−
−
waterproof window reveals/remove architraves.
seal against adjacent door trims.
Untreated masonry/render
−
“Render to be waterproofed to prevent moisture movement by capillary action or wicking”
−
Fully waterproof rendered shower walls to 1800mm from FL
Incompatible materials
−
−
−
−
primer/membrane/adhesives/sealants.
suitability of materials according to design
test tiles for shadowing
the right sealant for the job.
Non-Compliant Materials
Plaster set nib wall
Timber adj shower
Extent of Application
Extent of Application
Extent of Application
Extent of Application
Extent of Application
Critical Reference Points
Reference points for
extent of application
− Finished Floor Level (FFL)
Height
− Shower Rose Connection
Lateral & Height
− Shower Screen
Designates high risk area
Class Exercise 1
Extent of Application
Does this comply with extent
of application?
______________________________
______________________________
Why / Why not ?
______________________________
______________________________
What materials should be
used in the designated risk
area?
______________________________
______________________________
______________________________
Compliance Inspections
Builder is responsible to supervise
trades and ensure building is compliant with
BCA
Visual inspections should be conducted
throughout construction stages
Substrate (pre-waterproofing)
Membrane application
Completion
Compliance Inspections
Substrate
Taps, mixers, rose toilet
penetrations sealed
Water mark compliant
drainage flanges fitted
Wall/floor sheeting fixed
to manf. Specs and no
damage (9mm f/c for
large format tiles)
Baths/trays supported
and no damage
Substrate
Penetrations 3.10 &Table C1
Where a penetration
passes through a
waterproof or water
resistant construction,
the penetration shall be
waterproof.
Penetrations include:
- Substrate fixings
- Taps, rose and mixers
- Screens and fixtures
- Toilets, shelves and fittings.
Substrate
Penetrations 3.10
Taps sealed at substrate to
combination
Penetrations for taps, shower
nozzles, recessed soap
holders and similar fixtures
shall be waterproofed by
sealing with a proprietary
flange system or sealant.
When sealing the tap body to
the wall, allowance shall be
made for servicing of tap
washers or ceramic discs
without damaging the seal.
Substrate
Baths and Spas 3.8
Island Bath - Unsupported
Baths and spas shall be
supported to prevent
distortion and cracking.
When recessed into the wall:
water resistant surface
materials to pass down inside
the rim of bath
When installing baths the
integrity of the structure shall
be maintained
Hob Construction
Hob construction shall be of
masonry, concrete, corrosion
resistant metal or similar
material.
Autoclaved aerated concrete
(AAC) may be used for internal
membrane systems only, and
must be primed before
membrane application.
All gaps, joints and
intersections of the hob
structure shall be made flush
before membrane application.
TIMBER MUST NOT BE USED
Substrate
3.13.3
Substrate
Membrane to Drainage Connection
3.14
Termination to a drainage
flange 3.14.1
−
A drainage flange shall be
installed with the waterproofing
membrane terminated at/in the
drainage flange to provide a
waterproof connection.
Where a tile bed or screed is
used, the waterproof
membrane shall be installed
above or below the tile bed or
screed. 3.2
Substrate
Bond Breakers 3.13.7
Bond Breaker Requirements
Bond Breakers are required at all
junctions between wall/wall,
floor/wall, hob/ wall and movement
joints
Types of Bond Breakers
Class 1 Membrane
0 to 60%
−Type 1 Bond Breaker
75mm
Class 2 Membrane
60 to 300%
−Type 2 Bond Breaker
35mm
Class 3 Membrane
< 300%
−Type 3 Bond Breaker
12mm
Take a Break !!!
Compliance Inspections
Membrane
Application
Extent of application complies
with BCA Table 3.8.1.1 and
inspected for defects
All penetrations sealed, taps
sealed to allow for servicing
Dressed to shower, door and
hob bath angles
All non-compliant materials
protected
Membrane Application
Extent of Waterproofing
Appendix C
Type 1 & Type 2 Unenclosed
Shower
Table C1
Floor waterproofed and
dressed to barrier stop
Floor /Wall junction
waterproofed to 150mm
above FFL
Penetrations waterproofed
Sheet junctions waterproofed
to 40mm each side of junction
Wall substrate water resistant
to 1800mm min. from FFL
Type 1 – treatment to spray
barrier
Type 2 – treatment to
1500mm min from rose
connection
Membrane Application
Perimeter Flashings 3.9.1.1 & 3.9.1.2
Perimeter flashing min 25mm
above FFL
Dressed to door Angle across
cavity – continuous flashing
Membrane Application
Junctions and Flashings 3.9.1.1
All junctions to be sealed
Type 1,2,3,4 & 5
Type 1
W/proof to W/proof
Type 2
W/proof to
W/Resistant
Type 3
W/Resistant to
W/Resistant
Type 4
Non W/Resistant to
W/Resistant
Type 5
Full flashing 50mm
horizontal leg, 25mm above FFL
Vessel at wall junction –
sealed prior to tiling
Membrane Application
Vessels abutting a wall
Fig C4 & Table C1
Waterproof wall junction
where a vessel is fixed to a
wall
Water resistant to 150mm
above vessel
Where vessel is within 75mm
of a wall, water resistant to
150mm above vessel , for the
extent of the vessel
− Applies to wall mount
vanities, fitted to wall linings
Membrane Application
Baths and Spas Table C1
Free standing bath > 75mm from
wall
Waterproof from floor
to 150mm above bath
Membrane Application
Baths and Spas 3.8
Hob mount baths
For insert baths a water
stop shall be installed
around the periphery
Membrane to finish 5mm
above finished tile level
Barrier angle is not always
possible
Min. 100mm for shelf from
bath edge to finish.
Membrane Application
Baths and Spas Fig 3.2
Foam backing rod as
periphery barrier
Membrane dressed to 5mm
above Finished Tile Level
Membrane Application
Baths and Spas 3.8
No Barrier Stop
Membrane dressed
to Type 2 connector sealant
Membrane Application
Baths and Spas 3.7.3
Where no vertical
membrane termination, full
waterproofing under the
bath and space to be
ventilated.
3.7.4 For freestanding
baths with shower over, the
extent of waterproofing shall
be as for a Type 2
unenclosed shower, ignoring
the bath…
Membrane Application
Drainage Channels 3.14.3
Membrane dressed to puddle
flange at lowest point
Waterproof drainage shall be
continuous for the membrane
into the drainage outlet
Where the channel does not
have an integral 50mm flange
for termination of the
membrane, the membrane
shall be terminated to a
drainage flange beneath the
channel
Class Exercise 2
Compliance Inspections
Polished Concrete/ Tiled Walls
Does this floor comply with Table
C1 & Materials 2.4?
Why/Why Not?
1)Floor _______________________
______________________________
2)Wall connection ______________
______________________________
3)Floor waste __________________
______________________________
How can we make this wet area
compliant with AS 3740-2010?
______________________________________
______________________________________
______________________________________
______________________________________
______________________________________
Compliance Inspections
Practical Completion
Inspections
 Identify all wet areas
 Extent of application
 Installation details
 Practical functionality
Practical Completion Inspections
Identify all wet areas
All wet areas to be
waterproofed as per AS 3740
−
−
−
Bathroom, ensuite
W/C, powder room
Laundry, laundrette,
wash cabinet
Extent of Application
Assess shower category
Identify critical reference
points
Assess material coverage
compliant with Table C1
Practical Completion Inspections
Installation Details
Barrier angles in place
−
−
−
−
angle present at all showers and wet area
doorways
Angle visible to top of FFL, 5mm above for Type 1
Periphery barrier at hob mount baths
Cavity slider bridged, door angles connected to
membrane
Penetrations sealed
−
−
−
taps, mixer and rose penetrations sealed
Waste puddle flanges installed
Toilet pan, screen, shelf, grab rail fixings sealed
Practical Completion Inspections
Waterstop Angle at
Shower
− Angle across shower entry
− Flush with FFL
− Capped with ‘D ‘section
NO Waterstop Angle to
Shower
− Tiles not cut beneath
screen
− Probe test reveals no
obstruction : NO ANGLE
Practical Completion Inspections
Screen penetration sealed with
neutral cure silicone
Rose connection penetration
UN-SEALED
Practical Completion Inspections
Shower Grate –
NO Drainage Flange
Connection
Shower Screen –
Fitted to NON-COMPLIANT
materials
Practical Completion Inspections
Ineffective Falls
 Water exits shower area
•
3.4(b) Falls in shower floors shall be
sufficient to prevent… water from
discharging outside the shower area
 Overflow waste required for
Class 2 to 9 buildings
BCA Vol. 1 FP 1.6 Overflow from a
bathroom, laundry facility or the like
must be prevented from penetrating
to… in a storey below in the same
building:
(a) Another sole occupancy unit used
for sleeping accommodation
(b) A public space
•
Practical Completion Inspections
Practical Functions
Design
−
−
Design compliant with approved plans and
variations
Design suitable for intended use: disabled
access; slips and falls; grab rail positions
Falls
−
−
−
1:100 for main floors and enclosed showers
1: 80 for open-unenclosed showers
Falls to waste, no ponding, not exit shower
under normal use
Tiling Compliance
−
−
Lippage: 1mm rectified stone, 1.5mm rect tiles,
2mm cushioned edge tiles
Joint alignment + 2mm over 2m
Maintenance
−
Run water : no blockage to wastes
Waterproofing Certificates
Waterproofing Application
Certificates
Certificate to be issued upon
request from surveyor
To certify compliance with BCA
and AS 3740-2010
To include:
−
−
−
−
Extent of application
Product used with classifications
Material info such as curing,
compatible adhesives etc..
Declaration of compliance with
AS 3740 - 2010
To be issued by competent person
with either trade licence or
formal trade qualification
Class Exercise 3
Practical Completion
Inspections
Shower / Bath
700mm screen
Classify the wet area, nominate
extent of application & Identify 5
indicators of compliance in the
photo ?
Classification of wet areas
-----------------------------------------------------Extent of application
-----------------------------------------------------Application details/ defects?
Floor______________________
Shower____________________
Bath_______________________
Doorways__________________
Vanity_____________________
QUESTIONS?