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Bathroom & Wet Area Waterproofing
Installation and remediation of waterproofing systems in bathrooms, laundries, and other wet areas to protect structures from moisture damage, ensure compliance with Australian Standards, and extend the lifespan of finishes.

Wet areas — including bathrooms, ensuites, laundries, and commercial washrooms — are high-risk zones for water ingress. When waterproofing fails in these spaces, moisture seeps into walls, floors, and ceilings, causing mould growth, swelling of timber framing, tile debonding, and structural decay.

At Atomic Projects, we treat wet area waterproofing as a critical infrastructure task, not an afterthought. Our systems are installed with meticulous attention to junctions, penetrations, and transitions, following the latest AS 3740 requirements.

Our Bathroom & Wet Area Waterproofing Process

  1. Inspection & Substrate Assessment
    • Identify any existing leaks, rot, or structural movement.
    • Check drainage positions, falls, and substrate integrity before commencing works.
  2. Substrate Preparation
    • Ensure all surfaces are clean, dry, and structurally sound.
    • Prime surfaces with compatible primers to improve membrane adhesion.
    • Fill cracks and gaps with suitable sealants or mortars.
  3. Critical Area Detailing
    • Reinforce junctions (wall-to-floor, wall-to-wall, hob interfaces) with bond breakers or joint tape.
    • Apply additional membrane layers around tap penetrations, drains, and waste outlets.
  4. Membrane Application
    • Install high-performance liquid or sheet membranes, depending on site requirements.
    • Apply multiple coats to achieve the manufacturer’s specified dry film thickness.
    • Extend membrane behind wall linings and into door thresholds to prevent lateral moisture migration.
  5. Drainage & Falls Compliance
    • Ensure minimum falls to drains (1:60 in showers, 1:80 in other wet areas) for effective water flow.
  6. Curing & Quality Checks
    • Allow full curing time before tiling to avoid membrane compromise.
    • Conduct flood testing where required to verify watertightness.

Common Wet Area Waterproofing Failures We Repair

  • Membranes not extending behind wall tiles or into doorways.
  • Incorrect bond breaker installation, leading to cracking at corners.
  • Single-coat or under-thickness applications.
  • Poor adhesion due to unprimed or dusty substrates.
  • Drains without puddle flanges.

Why Atomic Projects for Bathroom & Wet Area Waterproofing

  • Standards-First Approach: All works meet or exceed AS 3740:2021 requirements.
  • Product-Matched Systems: Membranes selected for flexibility, chemical resistance, and compatibility with adhesives.
  • Zero Shortcuts: Every coat measured, every junction reinforced, every penetration sealed.
  • Warranty Confidence: Manufacturer-backed warranties on approved systems.

Waterproofing in wet areas isn’t just about keeping water out of the wrong places — it’s about safeguarding the structure from hidden decay. Our methodical, compliant approach ensures that your bathroom, laundry, or washroom remains dry, healthy, and free from costly moisture-related repairs for years to come.

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If you’re ready to get started, we're ready to help.

Take the next step and let’s build something that lasts.

 

📞 Call Us: 0410 515 509

✉️ Email Us: hello@atomicprojects.com.au

 

— Ben Tran, General Manager, Atomic Projects

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