PSA-Approved Waterproofing Contractor

AD Tiling is a PSA-Approved Waterproofing Contractor providing professional bathroom waterproofing and wet area waterproofing services in Invercargill, Gore, Winton, across Southland, and Dunedin.

Waterproofing in bathrooms and wet areas is one of the most critical stages of construction. Areas such as showers, shower trays, bathroom floors, bathroom walls, laundries, ensuites, and wet rooms are constantly exposed to moisture. Without properly installed waterproof membranes, water penetration can lead to structural damage, timber rot, mould growth, and costly repairs.

We specialise in certified waterproof membrane installation for:

• Bathroom floor waterproofing

• Shower waterproofing (walls and base)

• Tiled shower systems

• Ensuite and laundry waterproofing

• Wet room waterproofing

• Renovations and new builds

As a PSA-approved applicator, we install waterproofing systems strictly in accordance with:

• NZ Building Code – Clause E3 (Internal Moisture)

• NZ Building Code – Clause B2 (Durability)

• Manufacturer specifications

• Project architectural details and council requirements

• Relevant industry best practices

What Does PSA-Approved Mean?

PSA (Producer Statement Authorisation) approval means we are recognised and authorised to install specific waterproofing systems that qualify for formal producer statements.

For applicable projects, we can issue a:

PS3 – Producer Statement (Construction)

A PS3 confirms that:

• The waterproofing system has been installed correctly

• Installation complies with approved drawings and specifications

• The work meets the requirements of the New Zealand Building Code

• The system has been applied in accordance with the manufacturer's technical data sheets

This documentation is often required for:

• Building Consent applications

• Code Compliance Certificate (CCC) submissions

• Renovations involving bathrooms, laundries, balconies, and wet areas

Why Choose a PSA-Approved Contractor?

Using a PSA-approved waterproofing contractor ensures:

• Compliance with council requirements

• Reduced risk of inspection failures

• Proper system warranties

• Peace of mind for homeowners and builders

• Professional documentation support

Waterproofing is one of the most critical stages before tiling. Once tiles are installed, the membrane cannot be visually inspected — which is why correct preparation, application thickness, curing time, and detailing are essential.

At AD Tiling, we treat waterproofing as a structural protection system — not just a preparatory step before tiles.