The Warmup Waterproofed Shower System is designed to work seamlessly with Warmup underfloor heating — creating a fully compatible wet area build-up from substrate to tile finish. BRANZ Appraised and built to meet New Zealand Building Code requirements.
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For both elements and installation
Before and after install
A properly waterproofed wet area is the foundation of any successful bathroom renovation — and in any space that includes underfloor heating, the waterproofing layer must be installed correctly before the heating system is laid. The Warmup Waterproofed Shower System is designed to work as a coordinated system with Warmup underfloor heating, combining a sheet membrane, preformed shower trays, and the heating element into a single, BRANZ Appraised build-up.
The waterproofing membrane is applied to the substrate before the heating mat or cable is installed, forming a continuous waterproof barrier that protects both the substrate and the heating element from moisture ingress. Warmup’s technical team can advise on the correct product and application sequence for your project.
The Warmup Waterproofed Shower System holds BRANZ Appraisal No. 774 (2019), which confirms it meets New Zealand Building Code Clause B2 (Durability, including the 15-year performance requirement under B2.3.1(b) and B2.3.2) and Clause E3 (Internal Moisture, under E3.3.4, E3.3.5, and E3.3.6). The appraisal references a range of supporting standards, including AS 3740 (Waterproofing of wet areas within residential buildings), AS/NZS 4858 (Wet area membranes), AS 3958.1 (guide to ceramic tile installation), and AS/NZS 60335 (safety of flexible sheet heating elements). Tiling over the system must follow AS 3958.1 or the BRANZ Good Practice Guide: Tiling, using a flexible adhesive complying with AS 2358.
To remain within the terms of the BRANZ appraisal, the system must be installed by trained installers approved by Warmup New Zealand. The installation sequence — waterproofing membrane, then heating element, then tile adhesive and tiles — ensures both systems work correctly and the waterproof layer stays continuous beneath the heated floor. Sourcing your waterproofing and underfloor heating together from Warmup means you don’t need to worry about compatibility between components.
A sheet membrane waterproofing system, incorporating a purpose-designed undertile sheet membrane and preformed shower trays, applied to the substrate before the heating system is installed. It provides a continuous waterproof barrier beneath the heated floor and is compatible with Warmup undertile heating and compliant tile adhesives.
Warmup supplies waterproofing, underfloor heating, and thermostat products as a complete, BRANZ Appraised wet area package for any project. Contact our team for product specification advice and a full quote, or call 0800 WARMUP (0800 927 687).
A: The waterproofing membrane is applied to the substrate first, then the heating system is installed, followed by tile adhesive and tiles. This sequence keeps the waterproof layer intact and protects the heating element from moisture.
A: The Warmup Waterproofed Shower System holds BRANZ Appraisal No. 774 (2019), confirming it meets NZ Building Code Clause B2 (Durability, including a 15-year performance requirement) and Clause E3 (Internal Moisture). The appraisal also references AS 3740, AS/NZS 4858, AS 3958.1, and AS/NZS 60335 as supporting standards for the system’s components and installation.
A: To remain within the terms of the BRANZ appraisal, the system must be installed by a trained installer approved by Warmup New Zealand. Tiling over the system must follow AS 3958.1 or the BRANZ Good Practice Guide: Tiling, using a flexible adhesive complying with AS 2358.
A: If you’re renovating an existing shower floor, the old waterproofing membrane and any damaged substrate should be removed before the new system is applied. Warmup’s technical team can advise on surface preparation for your specific project.
A: The system is BRANZ Appraised to meet the NZ Building Code’s B2.3.1(b) durability requirement of 15 years.
