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.

Sealant

Top of Membrane

Finished Level

Screed

Weephole centres

DPC

Fall

- copy

AS 3700:2018, 4.7.2

≤ 1.2m^{AS 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 NCC^{AS 3700:2018, 4.7.2NCC 2022 Vol 2, H1D5}
Weepholes to be located above Flashing & spacing provided at^{NCC 2022 HP, 5.7.5}
≤ 1.2m CTS intervals

AS 3700:2018, 4.7.2

≤ 1.2m spacing^{AS 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 : 100^{AS 4654.2:2012, 2.5.2}

Membrane

AS 4654.2:2012, 2.8.2.2

≥ 300^{AS 4654.2:2012, 2.8.2.2}

AS 4654.2:2012, 2.8.1.3 (c)

≥ 10^{AS 4654.2:2012, 2.8.1.3 (c)}

Coping

Fillet

AS 4654.2:2012, 2.5.2

≥ 1 : 100^{AS 4654.2:2012, 2.5.2}

DPC

Flashing

Example

Roof Finish

Substrate

1 : 80

Fillet

40 x 40mm^[1] Sheet Membrane Fillet or Cove
15 x 15mm^[2] Liquid Membrane Fillet or Bond Breaker

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 NCC^{AS 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 Breaker^{NCC 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

40 x 40mm^{AS 4654.2:2012, 2.7} Sheet Membrane Fillet or Cove
15 x 15mm^{AS 4654.2:2012, 2.7} Liquid Membrane Fillet or Bond Breaker

Membrane Height

Height varies with wind class^[1][2]
Terminate with flashing, reglet or at drip groove^[3][4]

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 membrane^{NCC 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 membrane^{AS 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 only^{AS 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 class^{AS 4654.2:2012, 2.8.1.1AS 4654.2:2012, A}
Terminate with flashing, reglet or at drip groove^{AS 4654.2:2012, 2.8.1.3AS 4654.2:2012, 2.8.2.1}

Floor Finish

Fall to drainage
≥ 1 : 100^[1]
≥ 1 : 80 recommended
≥ P3 or R10 Slip Rating^[2]

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

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 NCC^{AS 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 membrane^{NCC 2022 Vol 2, H2D8}
Membrane bonded to topping or bedding^{NCC 2022 HP, 10.2.1}
≥ 10mm movement joint width at ≤ 4.5m CTS
Structural topping^{AS 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 joints^{AS 4654.2:2012, 2.15.3}

HB 198:2014, 5.1

AS 4654.2:2012, 2.5.2

Fall to drainage
≥ 1 : 100^{HB 198:2014, 5.1}
≥ 1 : 80 recommended
≥ P3 or R10 Slip Rating^{AS 4654.2:2012, 2.5.2}

Membrane

≥ 1 : 100^[1] fall to drainage
≥ 1 : 60 recommended
System compatible & to suit application^[2]

Membrane AUDIT

NCC 2022 V1

All building classes

AS 4654.2 2012, 2.16

14 Sep 2012 to Current

Waterproof Membrane BEST PRACTICE

NCC 2022 V1

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 NCC^{AS 4654.2:2012, 2.5.2NCC 2022 Vol 1, F1D5NCC 2022 Vol 2, H2D8}
Falls^{NCC 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 4654.1^{AS 4654.2:2012, 2.3}
Membrane movement Class I, II, or III
To suit intended service conditions
Substrate to be smooth, clean, dry & dust-free^{AS 4654.2:2012, 2.5.3}
Fillets & Bond Breakers installed on all corners^{AS 4654.2:2012, 2.7}
Lay & allow to cure as per Manufacturer's Recommendations^{AS 4654.2:2012, 2.6.2}

AS 4654.2:2012, 2.5.1

AS 4654.2:2012, 2.5.2

≥ 1 : 100^{AS 4654.2:2012, 2.5.1} fall to drainage
≥ 1 : 60 recommended
System compatible & to suit application^{AS 4654.2:2012, 2.5.2}