Waterproofing
Waterproofing is the invisible layer that protects your home from one of the most destructive forces in building — water. In Wellington, where wet winters, driving rain, and high humidity are the norm, proper waterproofing beneath tiles is not just good practice; it is a legal requirement under the New Zealand Building Code.
Rohullah Rassuli Tiling Services provides professional waterproofing for bathrooms, showers, wet areas, laundries, and balconies across the Wellington region. All of our waterproofing work is completed to the NZS 4858 standard, and we provide PS3 producer statements when required for building consent documentation.
Waterproofing failures are one of the leading causes of building defects in New Zealand. When a membrane fails, water penetrates the substrate, causes timber framing to rot, and can lead to tens of thousands of dollars in remedial work. Getting it right the first time is essential — and that is exactly what we do.
Waterproofing Services
Comprehensive waterproofing solutions for every wet area in your home or commercial property.
Bathroom Waterproofing
Full waterproofing of bathroom floors and walls before tiling. We apply liquid-applied membranes with band reinforcement at all internal corners, junctions, and penetrations to create a continuous, watertight barrier.
Shower Waterproofing
Showers are the highest-risk area for water ingress. We waterproof shower floors, walls (to full height), hob junctions, and waste penetrations to ensure complete protection against leaks.
Wet Area Waterproofing
Laundries, mud rooms, and any area with a floor waste or water supply require waterproofing. We protect the floor and a minimum of 100mm up the walls, plus full height behind any fixtures.
Balcony & Deck Waterproofing
Tiled balconies and decks over living spaces are particularly vulnerable to water damage. We install robust membrane systems with proper drainage falls, upstand details, and balustrade sealing.
Remedial Waterproofing
If existing waterproofing has failed, we strip back the affected area, investigate the source of the leak, and re-waterproof to current NZS 4858 standards before retiling.
Commercial Waterproofing
Kitchens, bathrooms, amenity blocks, and wet areas in commercial buildings. We understand the compliance requirements for commercial consent and deliver documentation to support sign-off.
NZS 4858 Compliance & PS3 Producer Statements
The New Zealand Standard NZS 4858 (2018) specifies the requirements for the installation of wet area membrane systems. It covers substrate preparation, membrane application, band reinforcement, minimum upturn heights, penetration sealing, and curing times.
All waterproofing by Rohullah Rassuli Tiling Services is completed in strict compliance with NZS 4858. This means:
- Substrates are inspected, cleaned, and prepared before membrane application
- Band reinforcement is applied at all internal corners, floor-to-wall junctions, and around penetrations
- Minimum two coats of liquid-applied membrane with proper drying time between coats
- Minimum upturn heights of 100mm on walls (or full height in showers)
- Penetrations (mixer taps, showerheads, waste outlets) are sealed with manufacturer-approved methods
- Membranes are allowed to fully cure before tiling commences
When your project requires building consent, we provide PS3 producer statements that confirm waterproofing has been installed in accordance with the membrane manufacturer's specifications and NZS 4858. This documentation is essential for Building Consent Authority (BCA) inspections and code compliance certificates in the Wellington region.
Why Waterproofing Matters in Wellington
Wellington's climate presents unique challenges for building waterproofing. The region receives significant annual rainfall, experiences frequent high-wind-driven rain events, and has humidity levels that keep moisture present long after the rain has stopped. Combined with New Zealand's predominantly timber-framed construction, this creates the perfect conditions for water damage when waterproofing is inadequate.
Many Wellington homes — particularly older villas and bungalows in suburbs like Thorndon, Mt Victoria, Aro Valley, and Newtown — have had bathrooms renovated over the decades without proper waterproofing. These properties are at high risk of concealed moisture damage to framing, flooring, and wall linings.
Even in modern homes and new builds, waterproofing must be installed by someone who understands the specific requirements of the New Zealand Building Code. A membrane that is too thin, improperly lapped, or not adequately reinforced at corners will eventually fail — and the damage is often hidden until it becomes severe.
By choosing Rohullah Rassuli Tiling Services for your waterproofing, you are investing in the long-term protection of your Wellington home.
Our Waterproofing Process
A systematic approach that ensures complete, code-compliant waterproofing on every project.
1. Assessment & Planning
We inspect the substrate, identify any defects or damage, and plan the waterproofing approach. We confirm the membrane system to be used and ensure compatibility with the chosen tiles and adhesive.
2. Substrate Preparation
The surface is cleaned, repaired, and primed. Any cracks, holes, or uneven areas are addressed. The substrate must be structurally sound, dry, and free of contaminants before membrane application.
3. Band Reinforcement
Reinforcing tape is embedded in wet membrane at all internal corners, floor-to-wall junctions, and around penetrations. This prevents cracking and movement at these critical stress points.
4. Membrane Application
A minimum of two coats of liquid-applied membrane is rolled or brushed onto all surfaces. Each coat must dry before the next is applied. We ensure full, even coverage with no pinholes or thin spots.
5. Curing & Inspection
The membrane is allowed to fully cure before any tiling begins. We inspect the completed membrane for coverage, thickness, and integrity, and photograph the installation for documentation.
6. Documentation
PS3 producer statements and photographic records are prepared for building consent documentation. These records confirm that waterproofing has been installed to NZS 4858 and the manufacturer's specifications.
Waterproofing Gallery
Related Services
Waterproofing is a critical component of every bathroom tiling project we undertake. It is also required for wet area floors in kitchens and laundries, and beneath floor tiles in areas with floor wastes.
If you suspect your existing waterproofing has failed — signs include musty smells, discoloured skirting boards, soft or bouncy floors, and visible mould — contact us immediately for an assessment. Early intervention can prevent major structural damage.
Ready to Start Your Tiling Project?
Get in touch with Rohullah Rassuli Tiling Services for a free, no-obligation quote. We'd love to help bring your vision to life.