Waterstop Membrane Building Codes & Rules

All Building Classes

NCC 2022 F2D2, S26C3, & Part 10.2.24 [2019 F1.7, 3.8.1]

May 2023

• NCC 2022 F2D2, S26C3, & Part 10.2.24 [2019 F1.7, 3.8.1]
• Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26, NCC Part 10.2, & AS 3740
• Backing rod, tape, or sealant should be installed when the membrane is bonded to the substrate
• Type depending on membrane flexibility class^{AS 3740:2021, 4.10}

Class I Membrane (low extensibility)

• Resin systems, or water-based epoxies membranes
• ≥ 6mm Ø^{AS 3740:2021, 4.13.2.2} backing rod should be installed to allow the membranes to flex instead of stretch, with a continuous tape between backing rod and membrane to keep it in place

Class II Membrane (medium extensibility)

• Acrylic membranes, bitumen-based emulsions or mastics membranes
• Tape to allow the membrane to stretch

Class III Membrane (high extensibility)

• Polyurethane, PVC, rubber, or EPDM membrane
• Fillet or sealant to allow even thickness to the membrane

All Building Classes

AS 3740 2021, 4.5.4

23 Jul 2021 to Current

• Compatible to suit substrate & bedding / finishes
• Test & protect from damage

Frame

Sealant Bead

Top of Membrane

Finished level

Structural level

M

M

M

M

Wall Lining

M

Substrate

Sealant / Adhesive

Finished Floor Level

M

≥ 150

Jamb

≥ 25

M

Waterstop Angle

• Preferred alignment to center of Door Leaf