Bathroom Waterproofing Checklist
Waterproofing is one of the most critical steps in any bathroom build or renovation — and one of the easiest to overlook. A small mistake can lead to major leaks, hidden mould, and costly repairs. Our bathroom waterproofing checklist helps you ensure every step is done right — and in compliance with local building codes and Australian Standards (AS 3740).
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Bathroom Waterproofing Checklist
Waterproofing is one of the most critical steps in any bathroom construction or renovation project. Done correctly, it protects your home from leaks, mould, and costly structural damage. Done poorly, it can lead to water seepage, cracked tiles, and repairs that far exceed the original build cost. A bathroom waterproofing checklist helps ensure every stage is carefully managed, from preparation and membrane application to inspections and final finishes. Whether you’re working with a professional or tackling small areas yourself, following a clear process ensures your bathroom stays watertight, safe, and compliant with building standards.
Bathroom Waterproofing Checklist
Check walls, floors, and joints for cracks, holes, or damage. Repair before applying waterproofing materials.
Remove dust, grease, and debris to ensure waterproof membranes adhere properly.
Apply an appropriate primer to concrete, plasterboard, or masonry to improve adhesion of waterproofing layers.
Spread the waterproof membrane evenly across all required areas, paying extra attention to corners and joints.
Install waterproofing tape or fabric reinforcement at wall-floor junctions, around drains, and pipe penetrations.
After the first coat has dried, apply a second coat at right angles to ensure full coverage and durability.
Fully waterproof shower floors, walls up to at least 1.8m, and ensure correct drainage gradients.
Waterproof around built-in baths, including walls and junctions between the tub and flooring.
Ensure all wall-floor intersections are sealed to prevent water seepage into adjoining rooms.
Carry out a flood test to confirm the waterproofing system is fully sealed before tiling begins.
Ensure waterproofing meets Australian Standards (AS 3740) or relevant local building codes.
Secure a waterproofing compliance certificate from a licensed contractor for warranty and legal requirements.
Proper bathroom waterproofing is an investment in the long-term health of your home. By following this checklist, you’ll ensure that every step—from preparation to compliance—is carried out thoroughly, protecting against leaks and structural damage. With quality materials and professional workmanship, your bathroom will stay watertight, durable, and worry-free for years to come.
How Much Does Waterproofing Cost?
Cost Guides How Much Does Waterproofing Cost? $320 to $1,500
