The ultimate sub-surface substrate





“wedi” building board is a surface carrier and adhesive substrate for applying stone, tile, laminate and other materials onto. Highly customisable, lightweight, durable and waterproof wedi allows design dreams come true.




Wedi building boards have a blue core made from CFC-free extruded polystyrene rigid foam. The rigid foam is reinforced with glass fibre (with alkali-resistant finish) on both sides and coated with a polymer-modified cement. This makes the wedi building board an ideal base substrate for any type of laminate, plaster, tile or stone surface. Wedi building boards can be applied to practically any substrate, are waterproof, insulating, versatile, light and robust.

The blue XPS core is 100% waterproof and remains fully functional even after possible damage. ABP building board butt joints can be sealed 100% simply by using Wedi 610, as no other seal is necessary, craftsmen benefit from increased security accompanied by a shorter tiling time.
The cemented surface is a good adhesive under-surface. The fibre fabric also absorbs tensile forces. All building board systems have great heat insulation properties.





Technical data of building board

Sound insulation DIN EN ISO 140-3 (at board thickness of 12.5 mm) Rw, P 23 dB
Fire behaviour EN 13501 E
Bending stress based on DIN 53293 3900 kPa (mean value)
Adhesive tensile strength 0,28 N/mm2
Weight: wedi building board (1250 x 600 x 4 mm) 2,7 Kg
wedi building board XXL (2500 x 1200 x 50 mm) 13,8 Kg
Linear coefficient of thermal expansion 0,02 mm/(mk)

Technical properties – Rigid foam

Long-term compressive strength (50 years) ≤ 2% compression EN 1606 0,08 N/mm2
Compressive resistance or compressive strength at 10% compression EN 826 0,25 N/mm2
Associated modulus of elasticity EN 826 10 – 18 N/mm2
Thermal conductivity EN 13164 0,036 W/mK
Tensile strength EN 1607 0,45 N/mm2
Shearing resistance EN 12090 0,2 N/mm2
Shear modulus EN 12090 7 N/mm2
Bulk density EN 1602 32 kg/m3
Resistance to water vapour diffusion(μ) EN 12086 100
Water absorption under long-term immersion EN 12087 ≤ 1,5 Vol.-%
Capillar action 0
Linear coefficient of thermal expansion 0,07 mm/mK
Temperature limits -50°C / +75°C
Fire behaviour EN 13501 E
Propellant gas, carbon dioxide, GWP value 1