wedi® Sealant 620

Product information

wedi® Sealant 620 is a flexible sealant offering vapor-tight performance. It is used with a wedi sealing tape to create strong connections in wedi® Subliner Dry Sheet waterproofing and wedi® Vapor 85 assemblies.

wedi® Vapor 85 steam shower installations are installed using the wedi® Sealant 620 between assembly components. Used to waterproof and affix wedi sealing tape over seams and fastener points. For use with all wedi® Subliner Dry products (includes wedi Inside/Outside Corner Sealing Tape, wedi waterproof sealing tape, wedi Vapor 85 patch kit for fastener locations, and wedi® Subliner Dry mats for seams and overlaps.

**Note: Thinset mortar is also used in the installation of wedi® Subliner Dry. See installation instructions for more information.

wedi® Sealant 620 is necessary to use in combination with wedi® Vapor 85 and wedi ®Subliner Dry. wedi 620, unlike wedi Joint Sealant, is not a standalone construction adhesive. Where wedi® Sealant 620 is used to adhere, connect and seal assembly parts, it needs to be used in combination with wedi® Subliner Dry sealing tape reinforcing all seams and joints.

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Installation Manual, Requirements/Limitations and Warranty
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 Data

Basic Material
Silyl Modified Polymer (SMP)
Grey or Anthracite
Hardening System
Through air humidity
ca. 1.45 g/ml
Solvent Content
Isocyanate Content
Drying Agent Content
approx. 100%
Elongation at break
approx. 250%
Skin formation
After approx. 15 minutes
Through-hardening (+73F / 50% RH)
approx. 3 mm per 24 hours
Permissible total movement
approx. 20%
Processing temperature
do not use below +41F
Temperature resistance
-104F + 212F up to 365F for short time (max 30 minutes)
Frost stability
not frost sensitive
Water Vapor Transmission
ASTM E96-2016, Permeance/Perms 0.03 and WVT (grains/h x ft sq) 0.05

Product Sizes

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

wedi® Sealant 620
Usage Amount
Item Number
Item Image
Sealant 620 Cartridge
10.5 oz.
12 per case. Full cases only
1.5 linear feet of 2 in. overlap; or flashing up wall per ounce
Sealant 620 Sausage
20 oz.
20 per case. Full cases only
1.5 linear feet of 2 in. overlap; or flashing up wall per ounce
Sausage Gun
1 pc
Sausage Gun Replacement Tip
10 pcs/box

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