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Building board Vapor

Building board Vapor

„The special building board for rooms with high humidity.“

Product information

wedi building board Vapor is a composite element made from extruded polystyrene rigid foam which is reinforced on both sides with a special cement coating, with a vapour barrier on one side.

  • For rooms where there is a permanently raised level of humidity
  • For walls, ceilings and floors
  • Vapour barrier and thermal insulation

All advantages at a single glance

Technical data of building board Vapor


Dimensions 600 x 2500 mm
Thickness 14 mm, 21,5 mm, 51,5 mm
Vapour barrier (sanded epoxy-resin vapour barrier) 1,5 mm
Diffusion equivalent air layer thickness, sd value (epoxy resin vapour barrier) 283 m
Resistance to water vapour diffusion(µ) EN 12086 188571
Fire behaviour EN 13501  E


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

Product sizes

Order no. Designation Length x width x thickness
010713112 wedi building board Vapor 12,5 mm 2500 x 600 x 12,5 mm
010713020 wedi building board Vapor with vapour barrier 20 mm 2500 x 600 x 20 mm
010713050 wedi building board Vapor with vapour barrier 50 mm 2500 x 600 x 50 mm

Construction panels for rooms with high humidity: wedi building board Vapor

  • The wedi building board Vapor may be used as heat insulation, while at same time, because of the coating applied in the factory; as a vapour barrier in rooms with permanently high humidity.
  • Particularlwhen used for wall areas it is one of the best carrier elements on the market - especially when used for public shower and spa facilities. It is also suitable for tile and plaster carrier element.

Optional articles

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Impressions of building board Vapor