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wedi Vapor 85

wedi Vapor 85

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"For wet rooms which are constantly under heavy strain“

Product information

A special variant of the wedi Building Panel, Vapor 85 is designed for the specific installation in steam showers and steam rooms. It will serve as a strong vapor retarder, by far exceeding the minimum equirements set by the Tile Council of North America (TCNA) for vapor retarders used in continuous use steam rooms. At the same time it offers all thebenefits of the traditional and time tested wedi Building Panel: it’s light yet strong. It is cut and worked with in a most clean and exact way. It adds insulation, and great adhesion to tile and other suitable surface finishes.

But the best feature is it is a component of a fully functioning system which was developed to also vapor-proof seams, and fastener penetrations. The Vapor 85 makes best use of wedi system technology taken from wedi Building Panel, wedi Subliner Dry, wedi Subliner Dry Sealing Tape, and wedi Joint Sealant. And of course, it works great with wedi Fundo or Subliner Dry on steam room floors.

  • For rooms with high levels of humidity
  • For wall, ceilings and floors
  • Waterproofing, vapour barrier and thermal insulation

Technical properties of wedi Vapor 85


Thickness 12,5 mm; 20 mm
Vapour barrier (polyethylene foil with special fleece layer) 0,51 mm
Water vapour diffusion equivalent air layer thickness Sd value 92 m
Resistance to water vapour diffusion (μ) DIN EN 1931 (sheet material vapour barrier) 170.000
Water vapour diffusion flow resistance Z value (sheet material vapour barrier) 555,64 GPa • m² • s/kg
1,54 •109 m² • s/kg
Water vapour diffusion flow resistance (sheet material vapour barrier) 4.065.287 s/m
Fire behaviour EN 13501, building material class E
Adhesive tensile strength 0,27 N/mm²
Linear coefficient of thermal expansion 0,02 mm/mK

Technical properties of raw foam building board systems

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 module 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/2
Shear modulus EN 12090 7 N/2
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.-%
Capillary action 0
Linear coefficient of thermal expansion 0,07 mm/mK
Temperature limits -50°C / +75°C
Fire behaviour EN 13501 E
Carbon dioxide propellant GWP value 1

Product sizes

Order no. Designation Length x width x thickness
010702912 wedi Vapor 85 3’ × 8’ × 1/2”
(900 × 2500 × 12.5 mm)

Areas of use wedi Vapor 85

wedi Vapor 85 is both a panel type sealing system and a building board with constructional and vapour resistant properties which is specifically tested and approved for wall applications. It can be used on solid walls and stud frames, as well as on floors and on ceilings, in interior areas. Due to its special properties, it is versatile in its applications:

• Carrier element for laying tile, slab and natural stone floor coverings using the thin-bed method, and surface for plaster and other materials
• Vapour barrier
• Effective thermal insulation
• Compound seal with tile and slab coverings on wall surfaces

Information about fitting, implementation of the sealing details and surface requirements can be found in the “wedi Vapor 85 building board application guidelines”.

Mandatory articles

Optional articles