Wet area design requires trusted, durable solutions that will last the test of time. A one-part, highly elastic, water-based polyurethane waterproofing membrane, Bostik Dampfix Gold Interior provides the durability and flexibility needed for long-term performance in New Zealand buildings.

Applications

Bostik Dampfix Gold Interior is specifically designed for internal wet areas such as showers, bathrooms, kitchens, laundries, and toilets, where it offers trusted waterproofing performance. The two-coat system is suitable for application over primed porous and non-porous substrates, including concrete, cement-rendered masonry, fibre cement sheeting, water-resistant plasterboard, and structural plywood. 

The product is BRANZ appraised and complies with AS/NZ 3740 and AS/NZ 4858, making it ideal for use under tile finishes in residential and commercial projects.

Key performance benefits

Long-term resilience

The Dampfix Gold Interior membrane provides long-term durability in wet environments. The membrane is highly resistant to detergents and bleaches, making it a robust choice for a range of projects, from stand-alone homes and medium density housing, to hotels, schools and commercial buildings. 

Exceptional flexibility

Dampfix Gold offers excellent flexibility with over 900% elongation — 3x the standard required under AS/NZ 4858. This flexibility means the membrane can accommodate substrate movement, making it fit for purpose here in New Zealand where wall and floor joints are subject to movement.

2-hour drying time for faster application

The Dampfix Gold Interior membrane requires only a 2-hour drying time between the first and second coat, enabling applicators to complete coating in just one day, and leaving the substrate tile-ready within 24 hours. 

The membrane is quick and easy to apply by brush, roller, or trowel, and doesn’t require mixing. It is compatible with Bostik tile adhesives, enabling a seamless system installation.

Design support

Bostik’s Technical Specifications Manager is available to provide support throughout the waterproofing specification process. They can answer questions, provide design guidance, and even complete specifications for architects. 

This support is backed by comprehensive documentation including BRANZ Appraisals, technical data sheets, and installation guides, as well as compatibility with BIM and CAD resources for integration into architectural workflows.

History of use

Bostik Dampfix Gold Interior has been used in the Australasian market for over a decade. The waterproofing system has been used for internal wet areas for residential developments, commercial buildings, and multi-unit housing projects across New Zealand. 

Warranty & maintenance

Once installed and tiled over, Dampfix Gold Interior requires minimal maintenance. It is designed to remain stable and effective over time, resisting common cleaning agents and environmental wear. 

When installed as part of a full Bostik waterproofing system, Dampfix Gold Interior is backed by a comprehensive full system warranty, which can extend up to 15 years, depending on the application and system components used. 

Environmental performance

Dampfix Gold is a water-based system with a low VOC formulation, contributing to healthier indoor air quality. 

Learn more

Get in touch with the Bostik technical team to learn more about specifying waterproofing membranes.