Parapet - Cavity Wall Building Codes & Rules
- Parapet - Cavity Wall Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.
M
M
Sealant
Top of Membrane
Finished Level
Screed
Weephole centres
DPC
Fall
Fall
- copyAS 3700:2018, 4.7.2
≤ 1.2mAS 3700:2018, 4.7.2
Flashing
DPC if Parapet above
Roof Cladding
Concrete Screeds
Weepholes
- ≤ 1.2m spacing[1]
- Clear of building debris
- Proprietary insert
Weephole RULES
NCC 2022 V3
Class 1 & 10
NCC 2022 H1D5 & HP5.7.5
[2019 3.3.1-3.3.3, 3.3.5-3.3.6, 3.3.5.9]
May 2023
AS 3700:2018, 4.7.2
NCC 2022 Vol 2, H1D5
NCC 2022 HP, 5.7.5
- Masonry to be designed & constructed to the NCCAS 3700:2018, 4.7.2NCC 2022 Vol 2, H1D5
- Weepholes to be located above Flashing & spacing provided atNCC 2022 HP, 5.7.5
- ≤ 1.2m CTS intervals
AS 3700:2018, 4.7.2
- ≤ 1.2m spacingAS 3700:2018, 4.7.2
- Clear of building debris
- Proprietary insert
Gap Below
Flashing
DPC Embedded
in Mortar
Roof Structure
1 : 60
AS 4654.2:2012, 2.5.2
≥ 1 : 100AS 4654.2:2012, 2.5.2
Membrane
AS 4654.2:2012, 2.8.2.2
AS 4654.2:2012, 2.8.1.3 (c)
Coping
Fillet
AS 4654.2:2012, 2.5.2
≥ 1 : 100AS 4654.2:2012, 2.5.2
DPC
Flashing
M
M
M
Example
Roof Finish
Substrate
1 : 80
Fillet
Fillet RULES
NCC 2022 V4
All Building Classes
NCC 2022 F1D5, H2D8, & HP10.2 [2019 F1.4, 3.8.1.2, 3.8.1.3]
May 2023
AS 4654.2:2012, 2.7
NCC 2022 Vol 1, F1D5
NCC 2022 Vol 2, H2D8
NCC 2022 HP, 10.2.1
- Building elements in Wet Areas to be Waterproof or Water-resistant to the NCCAS 4654.2:2012, 2.7NCC 2022 Vol 1, F1D5NCC 2022 Vol 2, H2D8
- Membrane transitions from horizontal to vertical, or vertical to vertical planes, require the implementation of a Fillet, Cove, or Bond BreakerNCC 2022 HP, 10.2.1
- 40 x 40mm Fillet or cove for Sheet Membrane
- 15 x 15mm Fillet or Bond Breaker for Liquid Membrane
AS 4654.2:2012, 2.7
AS 4654.2:2012, 2.7
- 40 x 40mmAS 4654.2:2012, 2.7 Sheet Membrane Fillet or Cove
- 15 x 15mmAS 4654.2:2012, 2.7 Liquid Membrane Fillet or Bond Breaker
Membrane Height
Membrane Height RULES
NCC 2022 V1
All Building Classes
NCC 2022 F1D5 [2019 Table F1.4]
May 2023
NCC 2022 Vol 1, F1D5
AS 4654.2:2012, 2.8.1.1
AS 4654.2:2012, A
- A roof, balcony, podium or similar horizontal surface part of a building must be provided with a waterproofing membraneNCC 2022 Vol 1, F1D5
- To AS 4654.1 & AS 4654.2
- Unless is a deck or perforated or directly above ground
- Measured from top of surface finish to height of membraneAS 4654.2:2012, 2.8.1.1
- Height sufficient to prevent wind-driven water entry
- Varies depending on wind class & level of protection
- Termination heights to AS 4654.2 2012, Table A1 are minimum & informative onlyAS 4654.2:2012, A
- Must be specified based on individual project wind classification
AS 4654.2:2012, 2.8.1.1
AS 4654.2:2012, A
AS 4654.2:2012, 2.8.1.3
AS 4654.2:2012, 2.8.2.1
- Height varies with wind classAS 4654.2:2012, 2.8.1.1AS 4654.2:2012, A
- Terminate with flashing, reglet or at drip grooveAS 4654.2:2012, 2.8.1.3AS 4654.2:2012, 2.8.2.1
Floor Finish
Surface FINISHES
NCC 2022 V4
All Building Classes
NCC 2022 F1D5, H2D8, & HP10.2 [2019 F1.4, 3.8.1.2, 3.8.1.3]
May 2023
AS 4654.2:2012, 2.15.2
AS 4654.2:2012, 2.15.2
NCC 2022 Vol 1, F1D5
NCC 2022 Vol 2, H2D8
NCC 2022 HP, 10.2.1
AS 4654.2:2012, 2.15.1
AS 4654.2:2012, 2.15.3
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCAS 4654.2:2012, 2.15.2AS 4654.2:2012, 2.15.2NCC 2022 Vol 1, F1D5
- Overlaying system not to harm & be suitable with the membraneNCC 2022 Vol 2, H2D8
- Membrane bonded to topping or beddingNCC 2022 HP, 10.2.1
- ≥ 10mm movement joint width at ≤ 4.5m CTS
- Structural toppingAS 4654.2:2012, 2.15.1
- ≥ 50mm thick with light mesh reinforcement
- Install double slip sheet on top of membrane
- Align movement joints in finishes over all building construction, control or movement jointsAS 4654.2:2012, 2.15.3
HB 198:2014, 5.1
AS 4654.2:2012, 2.5.2
- Fall to drainage
- ≥ 1 : 100HB 198:2014, 5.1
- ≥ 1 : 80 recommended
- ≥ P3 or R10 Slip RatingAS 4654.2:2012, 2.5.2
Membrane
Membrane AUDIT
NCC 2022 V1
All building classes
AS 4654.2 2012, 2.16
14 Sep 2012 to Current
Membrane RULES
NCC 2022 V5
All Building Classes
NCC 2022 F1D5, H2D8, & HP10.2 [2019 F1.4, 3.8.1.2, 3.8.1.3]
May 2023
AS 4654.2:2012, 2.5.2
NCC 2022 Vol 1, F1D5
NCC 2022 Vol 2, H2D8
NCC 2022 HP, 10.2.1
AS 4654.2:2012, 2.3
AS 4654.2:2012, 2.5.3
AS 4654.2:2012, 2.7
AS 4654.2:2012, 2.6.2
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCAS 4654.2:2012, 2.5.2NCC 2022 Vol 1, F1D5NCC 2022 Vol 2, H2D8
- FallsNCC 2022 HP, 10.2.1
- ≥ 1 : 100 fall in Membrane to Drainage Outlet
- Structural Substrate or Screed to form the required Falls
- Design & installation in accordance with AS 4654.1AS 4654.2:2012, 2.3
- Membrane movement Class I, II, or III
- To suit intended service conditions
- Substrate to be smooth, clean, dry & dust-freeAS 4654.2:2012, 2.5.3
- Fillets & Bond Breakers installed on all cornersAS 4654.2:2012, 2.7
- Lay & allow to cure as per Manufacturer's RecommendationsAS 4654.2:2012, 2.6.2
Waterproof Membrane BEST PRACTICE
NCC 2022 V1
AS 4654.2:2012, 2.5.1
AS 4654.2:2012, 2.5.2
- ≥ 1 : 100AS 4654.2:2012, 2.5.1 fall to drainage
- ≥ 1 : 60 recommended
- System compatible & to suit applicationAS 4654.2:2012, 2.5.2
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