wedi® 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
48 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
wedi® 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)
wedi® Sealant 620 Sausage
1.5 linear feet of 2 in. overlap; or flashing up wall per ounce
20 oz.
20/case (full cases only)
wedi ®Subliner Dry Sealing Tape
5 in. x 32.8 ft
1 roll
wedi® Subliner Dry Inside Corner
4 3/4 in. x 4 3/4 in. x 2 1/4 in.
2 pieces/bag
wedi® Subliner Dry Outside Corner
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