Flashing - Pressure Building Codes & Rules

- Flashing - Pressure Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.

Fall

Concrete Screeds

AS 4654.2:2012, 2.8.1.3 (a)

≥ 15^{AS 4654.2:2012, 2.8.1.3 (a)}

AS 4654.2:2012, 2.5.2

≥ 1 : 100^{AS 4654.2:2012, 2.5.2}

Sealant

Finished Floor Level

AS 4654.2:2012, 2.5.2

≥ 1 : 100^{AS 4654.2:2012, 2.5.2}

AS 4654.2:2012, 2.8.1.3 (c)

≥ 10^{AS 4654.2:2012, 2.8.1.3 (c)}

Finished Floor

Structural Substrate

Screed

Pressure Flashing

AS 4654.2:2012, 2.8.1.3 (a)

≤ 150^{AS 4654.2:2012, 2.8.1.3 (a)}

Membrane

Finished Floor Level

Floor System

≥ 1 : 80

≥ 1 : 60

AS 4654.2:2012, 2.8.1.3 (a)

≤ 150^{AS 4654.2:2012, 2.8.1.3 (a)}

Bottom of Fixings = Effective Membrane Height

Membrane Height

Height varies with wind class^[1][2]

Membrane Height RULES

NCC 2022 V5

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

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
Must be specified based on individual project wind classification

AS 4654.2:2012, 2.8.1.1

AS 4654.2:2012, A

Height varies with wind class^{AS 4654.2:2012, 2.8.1.1AS 4654.2:2012, A}

Weatherproof Wall

Fillet

Cover Flashing

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

Pressure Flashing

≤ 150mm CTS Mechanical fixings^[1]

Over-flashing INSTALLATION

NCC 2022 V1

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, 2.8.1.3

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, 2.8.1.3NCC 2022 Vol 1, F1D5NCC 2022 Vol 2, H2D8}
Seal flashing over Membrane^{NCC 2022 HP, 10.2.1}
≥ 15mm reglet cut into the waterproof wall
≥ 75mm lap over the Membrane
≥ 10mm clearance to FFL

AS 4654.2:2012, 2.8.1.3 (a)

≤ 150mm CTS Mechanical fixings^{AS 4654.2:2012, 2.8.1.3 (a)}

Membrane

≥ 1 : 100^[1] fall to drainage
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

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}

Waterproof Membrane BEST PRACTICE

NCC 2022 V1

AS 4654.2:2012, 2.5.2

AS 4654.2:2012, 2.5.1

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

Floor Finish

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

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}

AS 4654.2:2012, 2.5.2

HB 198:2014, 5.1

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