wedi Building Board XL – Extra-wide waterproof XPS board for fast installation
The wedi Building Board XL, with its 900 mm width, is ideal for creating large, flat surfaces with as few joints as possible. Lightweight, 100% waterproof, thermally insulating and ready to tile, it is perfect for rapid installation of bathroom walls, floors and bespoke constructions. Available in four thicknesses and, thanks to our extensive stock, almost always immediately deliverable.
➕ Extra wide (900 mm) – fewer joints and faster results
➕ 100% waterproof – no additional sealing required
➕ Lightweight and easy to cut to size
➕ Thermally insulating and dimensionally stable
➕ Ready to tile without additional preparation
➕ Suitable for freestanding shower walls from 50 mm thickness
Technical specifications
- Material: extruded polystyrene (XPS), closed-cell structure
- Coating: double-sided cement coating, glass fibre reinforced
- Dimensions: 2500 x 900 mm
- Thicknesses: 12.5 mm, 20 mm, 30 mm, 50 mm
- Water absorption: 0%
- Thermal conductivity: approx. 0.036 W/mK
- Fire classification: E (EN 13501-1)
Applications with wedi XL
The XL board is ideal for fast cladding of walls and floors, concealing pipework, building furniture elements, and constructing a stable freestanding shower wall when using 50 mm thickness.
wedi Building Board XL – the extra-wide, waterproof XPS board for fast and seamless bathroom construction
The wedi Building Board XL, with its 900 mm width, is the ideal solution for creating large, smooth wall and floor surfaces with minimal joints. Thanks to its strong XPS core, double-sided cement coating and glass-fibre reinforcement, each board forms a 100% waterproof, stable, and tile-ready base. Perfect for walls, floors, custom-built structures, and even freestanding shower walls when using the 50 mm thickness.
Waterproof, strong and ideal for large surfaces
The XL board offers the same high-performance properties as the standard wedi building board but allows you to work faster and achieve cleaner results due to its increased width. The board is completely waterproof, dimensionally stable and, thanks to its closed-cell structure, extremely reliable in wet environments. It provides a durable and thermally insulating substrate that is ready for tiling immediately.
The right thickness for every application – including freestanding walls
The XL boards are available in four popular thicknesses, suitable for a wide range of applications:
- 12.5 mm – ideal for renovation, levelling and cladding
- 20 mm – robust panelling for walls and furniture
- 30 mm – strong structural substrate for heavier applications
- 50 mm – suitable for freestanding, tileable shower and bathroom walls
Benefits of the XL building board
➕ Extra wide (900 mm) – fewer joints, faster and cleaner results
➕ 100% waterproof XPS core
➕ Lightweight and easy to process
➕ Ready to tile
➕ Thermally insulating and dimensionally stable
➕ Perfectly compatible with all wedi elements, such as Fundo and Top
➕ Ideal for large surfaces or freestanding walls (50 mm)
Fast, clean installation with wedi Tools
The XL board is easy to cut to size with a utility knife and can be bonded directly using wedi 610. For uneven substrates or additional security, rosettes and plugs may be used. Thanks to the rapid adhesion and lightweight properties, installation is clean, quiet and requires no drying time.
- wedi 610 adhesive and sealant – for bonding and waterproof connections
- wedi Joint Reinforcement Tape – for transitions to other materials
- wedi Sealing Tape – for fully waterproof joints
- wedi Rosettes & Plugs – for mechanical fastening
Applications for the XL building board
Use the XL board when you want to cover large areas, minimise joints or create a stable base for custom designs. The board is ideal for:
- wall cladding or bathroom walls
- cladding of old substrates and pipework
- floor substrates
- custom-built bathroom furniture
- freestanding shower walls (at 50 mm thickness)
Specifications
| Manufacturer | wedi |
| Product name | wedi Building Board XL |
| Type | XPS base board for wet areas |
| Dimensions | 2500 x 900 mm |
| Thicknesses | 12.5 mm, 20 mm, 30 mm, 50 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 |
Part of the complete wedi system
The wedi Building Board XL is part of the modular wedi system, in which all components integrate seamlessly. Combine XL boards with wedi Fundo shower floors, wedi Top design surfaces, niches, benches and other elements to create a fully waterproof, durable and high-quality bathroom build. Installation is fast, reliable and low-maintenance for many years.
