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⚠️ Guide 6 min read

Waterproofing: What Every Australian Homeowner Must Know

Waterproofing failures are Australia's single most common building defect. They're almost always preventable — and always expensive to fix.

Why Waterproofing Fails

Waterproofing failures occur when membrane is applied too thin, by an unlicensed person, substrate wasn't prepared correctly, or membrane wasn't given adequate drying time.

Where Waterproofing is Required

  • 1 Shower recesses and wet areas: mandatory under AS 3740
  • 2 Shower walls to a minimum height of 1800mm
  • 3 Balconies and decks with habitable space below

Who Can Apply Waterproofing?

In Australia, waterproofing in wet areas must be done by a licensed waterproofer.

⚠️ Watch out: DIY waterproofing in a shower is illegal in most states and will void your home insurance.

Pro tip: Before your tiler starts, take photos of the waterproofing membrane.

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