Marmox Multiboards are a BRANZ appraised product designed for use as an intermediate substrate to tiling for interior areas when applied to timber, plywood, fibre cement or concrete. They are constructed from extruded polystyrene (XPS) foam and reinforced with a layer of fiberglass mesh and polymer-modified cement to provide a lightweight, waterproof and thermally insulating solution. 

The key benefits of specifying Marmox Multiboards include: 

Suitable for a broad range of applications

Marmox Multiboards can be used in a wide range of applications, from wetrooms and floors to insulation layers beneath undertile heating systems.

• Residential projects: Ideal for tiled bathrooms — including those with undertile heating. 
• Commercial buildings: Suitable for bathrooms in hotels, gyms, and healthcare facilities thanks to their hygienic and moisture-resistant properties.
• Public infrastructure: A smart option for tiled bathrooms in transport hubs, schools, and community centres.

High performance moisture protection

Waterproof to the core, Marmox Multiboards provide a dependable moisture barrier, which is critical in bathrooms and wet rooms. They help prevent mould and structural damage, reducing long-term maintenance issues.

Thermal insulation

Thanks to the XPS core, these boards significantly contribute to a building’s thermal envelope. Their insulation properties help reduce heat loss, contributing to more energy-efficient buildings.

Lightweight yet strong

Despite their robust structural performance, Marmox Multiboards are lightweight and easy to handle and install.

Compatible with undertile heating

Marmox Multiboards offer a high performance base for electric undertile heating, ensuring efficient heat transfer and insulation.

Environmentally friendly

Marmox Multiboards are made with recyclable materials and contribute to greener buildings by reducing thermal bridging and energy consumption.

A reliable, tested solution

Marmox Multiboards are a reliable, tested, and certified building product that supports compliance with thermal, acoustic, and moisture protection requirements. With BBA certification and compliance with relevant building codes, architects can design with confidence.