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Vapor Barrier

Vapor Barrier

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Product information

Whether installed in a steam room with commercial 24 hour use or in a residential steam shower, waterproof and insulating wedi Building Panels, just combined with wedi Vapor Barrier, a strong vapor retarder and waterproofer, form the industry’s first sufficient solution and effective barrier to protect your tiled steam room against the threat of water vapor transmission through walls or ceilings- leaving nothing to question. Water vapor transmission through building materials into walls or ceiling substrates can cause deterioration and mold. Traditional vapor retarders and waterproofing methods often fail to address the challenges in many situations due to use of products that may act as a waterproofing but may display insufficient or no water vapor retarding properties, or the proper placement of water vapor retarders or the entire installation concept may be wrong. Many latex based waterproofing products may only work as vapor retarders when applied in thicknesses very difficult to apply on site. Many installation concepts may fail because they allow water vapor pressure to build up due to a lack of insulation in a wall ceiling which may lead the chosen vapor retarder to fail. To be sure, steam showers and rooms also require waterproofed surfaces just like general shower or wet rooms. A tricky part is, however, that it is not safe to assume that a vapor retarder layer can generally be a waterproofing layer able to withstand (liquid) water pressure and vice versa. The wedi System offers all three: The waterproof and vapor retarding XPS foam underlayment systems with insulation value built in, and the surface added, strong liquid wedi vapor barrier- a waterproofing product as well- all in one compact system.

  • Protects through its firm membrane barrier formationagainst water vapor migration
  • 100% mold and mildew proof due to the product‘s natural composition
  • Stable and ready to tile surface offers tenacious bond /adhesion to thinset mortar
  • Zero VOC/ Solvent formulation/ LEED contributing
  • Contributes to LEED (EQ 4.2=1 pt.)
No limitation to use of polymer or latex modified cement based thinset mortars and groutsadequate for areas subject to extreme wetness andacute and sudden temperature changes such as insteam  showers and steam rooms. . Product works perfectly with epoxy based grouts/ thinsets as well.

Technical details Varpor barrier


wedi Vapor Barrier Characteristics 100% Solids Epoxy; 2 – component, clear
VOC/Solvent Content 0 g/L Volume Solids
Flashpoint Part A (Resin) >212°F ( >100 °C)
Flashpoint Part B (Hardener) >170°F ( >77°C)
Mixing Ratio (by weight) 100 Part A : 47 Part B
Viscosity 600±80 cps ( mPa*s)@ 77°F (25°C)
Pot Life (Approximately) 15 Minutes ( 150 gram mass) at 73°F ( 25°C)
Working Temperature 40° F to 85° F ( 5° C to 30°C) Curing Temperature
Curing Temperature minimum 40° F (5 ° C)
Full StrengthPermeability; ASTM E96,Method E tested at 100°F/90% R.H.; Desiccant Method after 7 days at 73°F ( 23 °C) <0.09 (0.09 grains/h-ft²-in Hg. perms)
Capillarity 0
Indoor Air Comfort 5.a EN717-1 Formaldehyde was below limit of 60 μg/m3 @ 28 days
High Alkalinity Barrier; ASTM D1308 pH 14
Fungus & Bacteria Resistance No Growth , Passes
Adhesion / Tensile Strength; ASTM 723; 7 Day Test; 3 Specimens 574 PSI Average

Product sizes

Order no. Designation Unit
US5000051 wedi Accessories Vapor Barrier 1 container

Areas of use wedi Vapor Barrier

• New Construction of Residential/Commercial usebuildings
• Renovation in Residential/Commercial use buildings
• Wet areas such as showers and steam baths/rooms
• Over wedi steam room structures/surfaces

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