Vapor 85

Product information

A special variant of the wedi Building Panel, wedi Vapor 85 is designed for the specific installation in steam showers and steam rooms. It will serve as a strong vapor retarder, far exceeding the minimum requirements 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 the benefits of the traditional and time-tested wedi Building Panel: it is light yet strong. It can be cut and worked with in a clean and exact way. It adds insulation and provides great bond for tile and other suitable surface finishes.

However, the best feature is that it is a component of a fully-functioning system, which was developed to also vaporproof seams, and fastener penetrations. The wedi 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. Additionally, it works great with wedi Fundo® or Subliner Dry on steam room floors.

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How to Build a Steam Room using wedi Vapor 85 Building Panels Video
Installation Manual and Requirements/Limitations
Product Approvals & Certification

Approvals and certificates applicable to entire Fundo Shower System incl. wedi Building Panel:

City of New York, MEA 912-52-SM

Fundo Shower Systems & Building Panels: ICC PMG 1189 (for USA & Canada) – Download Here

Meets all applicable ANSI/ISO Standards incl. ANSI 118.10 and IAPMO PS106

TCNA handbook recognized for wall, floor, countertop, & more applications

City of Los Angeles Approval M-100017

BBA (British Board of Agrement)


CE Marked

Diverse State Approvals

SAI Global Watermark Certified (Australia & New Zealand)

Codemark Certified (Australia & New Zealand)

Technical Performance Data

Tensile Strength
65 psi
Shear Strength
Under conditions required in ANSI A118.10-1999
4 week Shear Strength Dry: 216 psi 12 week Shear Strength Dry: 217 psi 100 day Shear Strength Wet: 201 psi
ASTM D4068 / ANSI A118.10-1999
Fungus/Bacteria Resistance
Passed, No Growth
Linear Variation
AC 159/ASTM 1037-39
Passed, less than 0.07%
Seam Strength
ASTM D751-11 (requirement 8 lb/in width)
Passed, 36.4 lbs
Wate Vapor Transmission
ASTM E 96 - 2016
Permeance/Perms 0.03 and WVT (grains/h x ft^2) 0.05

Product Sizes

For product retail pricing, please see our Illustrated Retail Price List (USA or CA), available in the downloads section below.

Main Application
Usage Amount
Item Number
wedi Vapor 85
36 in. x 96 in. x 1/2 in.
50 sheets/pallet
wedi Vapor 85 - Fastener Patch Kit
3 in. x 3 in. squares
100 pieces/bag
Sealant 620 Cartridge
1.5 linear feet of 2 in. overlap; or flashing up wall per ounce
10.5 oz.
12/case (full cases only)
Sealant 620 Sausage
1.5 linear feet of 2 in. overlap; or flashing up wall per ounce
20 oz.
20/case (full cases only)
Sealing Tape
5 in. x 32.8 ft
1 roll
Inside Corner Sealing Tape
4 3/4 in. x 4 3/4 in. x 2 1/4 in.
2 pieces/bag
Outside Corner Sealing Tape
4 3/4 in. x 4 3/4 in. x 2 1/4 in.
2 pieces/bag

Step 2 Complete!

You’ve chosen your building panels, now choose your prefab modules!

Additional Downloads