wedi Building Board XXL – Extra-wide (1200 mm) waterproof XPS board for large surfaces
The wedi Building Board XXL, with its generous 1200 mm width, is the ideal choice for creating large, seamless wall and floor surfaces with minimal joints. The board is lightweight, 100% waterproof, thermally insulating and ready to tile. Perfect for spacious bathrooms, wellness projects and custom-built constructions. Available in multiple thicknesses and lengths, and thanks to one of the largest stocks in the Netherlands, almost always quickly available.
➕ Extra-wide (1200 mm) – minimal joints, perfectly smooth results
➕ 100% waterproof – no additional sealing required
➕ Lightweight and easy to work with
➕ Thermally insulating, dimensionally stable and ready to tile
➕ Ideal for large surfaces and wellness environments
➕ Freestanding shower wall possible from 50 mm thickness
Technical specifications
- Material: Extruded polystyrene (XPS), closed-cell structure
- Surface: Double-sided, glass fibre reinforced cementitious coating
- Dimensions: 2500 x 1200 mm or 2600 x 1200 mm
- Thicknesses (2500 x 1200 mm): 10 mm, 20 mm, 30 mm, 50 mm
- Thicknesses (2600 x 1200 mm): 12.5 mm, 20 mm, 80 mm, 100 mm
- Water absorption: 0%
- Thermal conductivity: approx. 0.036 W/mK
- Fire classification: E (EN 13501-1)
Applications with wedi XXL
The XXL board is ideal for quickly covering large walls and floors, for wellness and high-end bathroom projects, for concealing pipework and for strong custom constructions. From 50 mm thickness upwards, even freestanding shower walls can be created.
wedi Building Board XXL – the extra-wide, professional base for large, waterproof and high-end bathroom projects
The wedi Building Board XXL, with its impressive width of 1200 mm, is designed for large surfaces that need to be installed quickly, cleanly and with as few joints as possible. Thanks to its strong XPS core, double-sided glass fibre reinforced cement coating and excellent dimensional stability, the XXL board forms a 100% waterproof, robust and ready-to-tile substrate for even the most demanding bathroom and wellness designs.
The XXL board is available in two lengths (2500 mm and 2600 mm) and in a wide range of thicknesses up to 100 mm. This makes it suitable for standard bathroom construction as well as large-scale wellness environments, luxury shower areas and custom-built structures.
Waterproof, strong and ideal for large surfaces
The 1200 mm wide XPS board does not absorb water and provides an extremely stable base for tiles and cement-based finishes. Its generous size allows you to work faster while creating smooth, continuous surfaces with minimal visible joints. Ideal for wide walls, large shower zones, wellness rooms or bathrooms where clean lines and calm surfaces are essential.
The right thickness for every application – including freestanding walls
wedi XXL boards are available in thicknesses from 10 mm up to 100 mm, making them suitable for everything from wall cladding to structural applications. From 50 mm upwards, you can even create stable freestanding shower walls without the need for heavy construction.
- 10 mm – ideal for renovation and wall levelling
- 12.5 mm – strong cladding for walls and ceilings
- 20 mm – robust for wall and floor construction
- 30 mm – added strength and stability
- 50 mm – suitable for freestanding shower walls
- 80 mm – for solid custom-built elements
- 100 mm – maximum rigidity for large structures
Benefits of the XXL building board
➕ Extra wide (1200 mm) – minimal joints and fast installation
➕ 100% waterproof XPS core
➕ Lightweight, strong and easy to handle
➕ Thermally insulating and dimensionally stable
➕ Ready to tile without additional preparation
➕ Perfect for large bathrooms, wellness areas and custom designs
➕ Freestanding walls possible from 50 mm thickness
Fast, clean installation for professionals and DIY users
Like all wedi building boards, the XXL board is easy to cut with a utility knife and can be bonded directly using wedi 610. Its large surface area not only speeds up the installation process but also reduces the number of joints and potential errors. For uneven substrates or additional stability, mechanical fixing with washers and plugs can be added.
- wedi 610 adhesive and sealant – for strong, waterproof connections
- wedi Reinforcement Tape – for transitions to other materials
- wedi Sealing Tape – for fully waterproof joints
- wedi Washers & Plugs – for mechanical fixing where required
Applications of the XXL building board
The XXL board is ideal for spacious bathrooms, wellness areas and any project that requires large surfaces or custom-built features. Use it for:
- large wall and floor areas with minimal joints
- cladding old substrates and pipework
- structural custom elements such as benches, enclosures and niches
- freestanding shower walls (from 50 mm)
- wallets and premium projects with high technical and aesthetic demands
Specifications
| Manufacturer | wedi |
| Product name | wedi Building Board XXL |
| Type | XPS building board for wet rooms |
| Dimensions | 2500 x 1200 mm or 2600 x 1200 mm |
| Thicknesses (2500 x 1200 mm) | 10 mm, 20 mm, 30 mm, 50 mm |
| Thicknesses (2600 x 1200 mm) | 12.5 mm, 20 mm, 80 mm, 100 mm |
| Material | XPS core with glass fibre reinforced cement coating |
| Water absorption | 0% – fully waterproof |
| Thermal conductivity | approx. 0.036 W/mK |
| Suitable for | tiles, cement-based plaster, natural stone |
The foundation of the complete wedi system
The XXL board forms, together with the standard and XL boards, the backbone of the complete wedi system. Combine the boards with wedi Fundo shower bases, wedi Top design surfaces, niches, benches and other components to build a fully waterproof, durable and modular bathroom concept with maximum design freedom.
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