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● Wet areas

Shower wall waterproofing. Junctions, or the whole wall?

1 min readFORSPEC Technical Team

The short version

  • On its own, AS 3740 asks for the shower wall junctions to be waterproof and the wall faces to be water resistant.
  • The NCC asks for the whole shower wall face to be waterproof to at least 1800 mm.
  • Both apply. Waterproof the whole wall.

This is the most common gap between what a waterproofer was taught and what a certifier looks for. Both are reading a real rule. They are reading different documents.

What each document asks for

AS 3740, wall junctions
Waterproof to 1800 mm above the floor, or 50 mm above the shower rose if that is higher
AS 3740, wall faces
Water resistant
NCC, shower wall faces
Waterproof to at least 1800 mm

The NCC lets you use AS 3740 for how the work is done. It does not let AS 3740 reduce where the waterproofing has to go. The code's own list of what is waterproof applies on both paths, for houses and for apartments.

On site

Where this comes from

Standards are summarised in FORSPEC's own words as a guide. Read the standard itself and your project documents before you build.

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Systems, products and drawings

SystemInternal Wet Area WaterproofingThe full build-up, layer by layerProductACTFLEX 989 CWPTwo-part flexible cementitious acrylic membrane for internal and external wet areas, recoatable in just 4–6 hours.ProductACTFLEX 906 WPUSingle-component water-based polyurethane membrane for wet areas and protected external areas beneath tiles and screeds.DrawingB108 · FC Internal CornerCAD detail: PDF and DXFDrawingICL001 · Window In ShowerCAD detail: PDF and DXFRangeAll FORSPEC productsBy system, with data sheets and calculators
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