Waterproofing is what keeps your bathroom safe, dry, and long-lasting. Without it, moisture seeps into walls, floors, and substructures, leading to mould, cracked tiles, structural damage, and costly repairs. In fact, industry reports suggest that up to 90% of bathroom complaints in Australia are due to poor waterproofing.
At aba Renovations, we don’t take shortcuts. We follow best practice waterproofing methods and ensure every Adelaide bathroom we build exceeds the National Construction Code (NCC 2022) requirements. This guide will walk you through:
- Why waterproofing is essential in showers
- The updated NCC 2022 waterproofing standards
- Common causes of waterproofing failure
- Our step-by-step process for shower waterproofing
- Best materials for Adelaide bathrooms
- How aba Renovations gives you peace of mind
Understanding NCC 2022 Waterproofing Requirements
Australia’s National Construction Code (NCC 2022), adopted in May 2023, updated the rules around waterproofing wet areas. These changes were driven by years of data showing that bathrooms were failing due to insufficient protection.
Here’s what homeowners need to know:
- Shower walls must be fully waterproofed to at least 1800mm above the finished floor level (or 50mm above the shower rose, whichever is higher).
- Enclosed showers (with screens or doors) and unenclosed showers (open walk-ins) have slightly different waterproofing requirements.
- Substrates (the base material under your tiles) must be water-resistant, not just the surface.
- Membranes must meet AS/NZS 4858:2004 standards and be installed by qualified professionals.
Tiles and grout alone are not waterproof — they are only water-resistant. True waterproofing requires multiple layers of protection.
Common Causes of Shower Waterproofing Failure
We’ve been called in many times to fix failed bathroom renovations completed by inexperienced contractors. The common culprits are:
- Improper installation of waterproofing membranes (rushed, not cured properly, or applied too thinly)
- No primer used before membrane application
- Movement in building materials (timber floors expanding differently to tiles or concrete walls)
- Poor joint sealing between walls, floors, and fixtures
- Using unqualified trades who don’t understand NCC standards
Every one of these failures can lead to leaks hidden behind your bathroom walls — problems that often don’t appear until months or years later, by which point the repair bill is huge.
Our Best Practice Waterproofing Process
At aba Renovations, waterproofing isn’t just a step in the job — it’s the foundation of your bathroom. Here’s how we do it:
1. Substrate Preparation
We start with a stable, dry, and clean substrate. Depending on your bathroom, we may use water-resistant plasterboard or fibre cement sheeting for walls, and compressed fibre cement or concrete for floors.
2. Priming
A high-quality primer is applied to ensure the waterproofing membrane bonds securely to the substrate.
3. Membrane Application
We use liquid-applied waterproof membranes that meet AS/NZS 4858:2004 Wet Area Membranes. These are rolled or brushed onto walls and floors in multiple coats, with each coat allowed to fully cure before the next.
4. Reinforcement
Corners, junctions, and penetrations (such as pipes and drains) are reinforced with bond breakers and sealing tapes to allow for natural building movement without cracking the membrane.
5. Coverage
- Shower walls: Waterproofed to 1800mm minimum height.
- Shower floors: Fully waterproofed with graded falls towards the drain.
- Other wet areas: Splash zones near vanities and baths are water-resistant at a minimum.
6. Inspection & Quality Check
Before tiling, our project manager inspects the membrane thoroughly to ensure compliance with NCC standards.
7. Professional Tiling
Our tilers then lay tiles with appropriate adhesives and grout. Finally, joints are sealed with waterproof silicone to complete the barrier.
Best Materials for Waterproofing Showers
Not all waterproofing products are created equal. At aba Renovations, we select materials designed for Adelaide’s climate and long-term durability.
- Liquid-applied waterproof membranes (flexible, seamless, high bond strength)
- Water-resistant plasterboard (such as moisture-resistant gyprock for walls)
- Fibre cement sheeting (ideal for floors and high-impact areas)
- High-performance sealants for joints and penetrations
- Anti-mould silicone in wet area finishes
By combining the right materials with professional installation, we guarantee long-lasting results.
Real-Life Example: A Failed DIY Waterproofing Job
A client in Norwood contacted us after discovering mould spreading through their bathroom walls just two years after a renovation. The cause? The original contractor had only waterproofed the floor junctions and not the entire shower wall.
We had to strip the bathroom back to its frame, replace water-damaged studs, re-sheet the walls, and apply a new waterproofing system to NCC 2022 standards. The repair cost more than the original renovation.
Lesson learned: waterproofing is never the place to cut costs.
Why Choose aba Renovations for Waterproofing?
Here’s what sets us apart:
- 25+ years of experience in Adelaide bathroom renovations
- Fully licensed, insured, and NCC-compliant trades
- Strict quality control on every waterproofing layer
- We manage the entire renovation (no subcontractor roulette)
- 20-year labour warranty for peace of mind
Frequently Asked Questions About Shower Waterproofing
Yes — NCC 2022 requires it, and it prevents future leaks. Partial waterproofing is a major cause of bathroom failures.
When done properly with quality materials, waterproofing can last 20+ years — especially with our 20-year workmanship guarantee.
DIY waterproofing is risky. Only licensed professionals can guarantee compliance with Australian Standards. Insurance claims often fail if waterproofing isn’t certified.
Membranes need proper curing time (often 24 hours per coat). We never rush this step.
We’ve built our reputation on honesty, transparency, and lasting quality. With aba Renovations, you’ll never have to worry about leaks undermining your investment.A beautiful bathroom means nothing if it isn’t built to last. Shower waterproofing is the backbone of your renovation, and when done right, it protects your home, your health, and your wallet.
At aba Renovations, we follow best practice at every step — from substrate preparation to membrane curing and final tiling. Our goal is simple: give you a bathroom you’ll love, with the peace of mind that it’s built to last.