Building Panel Specialty Applications

Product information

wedi® Building Panels offer endless customization and installation options. Available in a wide variety of thicknesses and sizes, they are compatible with virtually any substructure. While often used within the range of wedi shower systems, they are also a formidable tile backer board for general use on wet area walls, floors, countertops, and more. There are many specialty applications for wedi® Building Panels, but it is highly recommended to follow instructions closely and use the correct size and thickness Building Panel for every application.

Individual Bathroom Furniture

wedi Building Panels can be used to create an endless range of designs and grant you plenty of scope to develop your ideas for virtually all applications. Since wedi® Building Panels offer exceptional moisture protection and heat insulation, your installations are guaranteed to meet the highest quality standards, no matter the shape and size you choose to create.

Countertops and Backsplashes

The wide range of sizes and thicknesses of wedi® Building Panels is ideal for several applications in kitchens: Behind backsplashes or on countertops over cabinets, and eliminating the customary plywood sheet. The flat and rigid structure of the wedi Building Panel surface makes installation of special tiles better and safer. These include thin and/or large tile, mosaics, natural stone slabs, and composite materials like quartz. Especially when high rise building projects allow for repeating installation formats, the lightweight wedi® Building Panels can often be pre-tiled and installed on the job in one step. The wedi® Building Panels used below range from as thin as 1/8 in. to as thick as 2 in.

Ghost Accordion

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How to Build a Mosaic Wall Video
Installation Manual, Requirements/Limitations and Warranty
Product Approvals & Certification

Approvals and certificates applicable to entire Fundo Shower System incl. wedi Shower Seats and Benches:

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

ASTM C 578
Standard Specification for Rigid, Cellular Polystyrene
Thermal Conductivity
75°F (25°C) - ASTM C518
0.23 Bbtu in/hr F
75°F (25°) - ASTM C518
4.3hr ft. 2 F/Btu/in (R Value for 1” wedi = 4.3)
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
Flexural Strength
627 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
Robinson Floor Test
Heavy duty commercial use, passed
Fastener Pull Through
Wet 131.8 lb./Dry 196.2 lb.
Temperature Limits
-58 / +165° F
Freeze & Thaw
ASTM C666 - 25 Cycles
No disintegration/change; Passed
Accelerated Aging
AC 71 - 25 Cycles
No disintegration; Passed
Surface Burning Characteristics
ASTM E84-16 (NFPA 255, ANSI / UL 723, UBC 8-1) Tested as required without tile on Building Panel surface
Flame Spread Index (FSI): 20 | Smoke Developed Index (SDI) : 70 |Classification: Class A

Product Sizes

To determine the size and quantity of wedi Building Panels you will need for your shower, please follow the steps outlined below: 

First, you must calculate the total area of the shower walls. To do this, measure the area of each shower wall by multiplying the length of the wall by the height. The height of each wall will be determined based on how high you plan to install the tile. Next, add the calculated square footage of each wall together to determine the combined sum of all the shower walls. Account for about 15% extra square feet of building panel for any waste cuts by multiplying the combined area of all shower walls by 1.15.

Next, divide the total area of the shower walls by the square foot area of the wedi building panels you plan to use (eg: 4×5 ft. building panel = 20 square feet). A total shower wall area of 115 square feet divided by 20 square feet per building panel gives us a total of 5.75 building panels. Remember to always round up to the next whole building panel. 


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

Item Number
Constructing benches, floors to line up with Fundo Primo into bathroom
48 in. x 60 in. x 1 1/2 in.
2 sheets/box
Constructing benches and suspended seats, freestanding walls and partitions
48 in. x 60 in. x 2 in.
2 sheets/box
Constructing benches and suspended seats, freestanding walls and partitions
48 in. x 60 in. x 5/8 in.
50 sheets/pallet
Constructing benches and suspended seats, freestanding walls and partitions
48 in. x 96 in. x 2 in.
12 sheets/pallet
Wall panel
36 in. x 60 in. x 1/2 in.
50 sheets/pallet
Wall panel
48 in. x 60 in. x 1/2 in.
50 sheets/pallet
Wall panel
48 in. x 96 in. x 1/2 in.
4 sheets/box
Wall panel - Best Value!
48 in. x 96 in. x 1/2 in.
50 sheets/pallet
US8000015 (pallet)
Wall panel, aligns with 5/8 in. drywall
48 in. x 60 in. x 5/8 in.
4 sheets/box
Wall panel, lines up with floated walls
48 in. x 60 in. x 1 in.
4 sheets/box
Backsplash, tub decks, floors
24 in. x 48 in. x 1/8 in.
10 sheets/box
Tub decks, floors, with electric radiant heat
48 in. x 60 in. x 1/4 in.
25 sheets/pallet
Floor panel, aligns with Fundo Ligno bases to create extension to bathroom floor
48 in. x 60 in. x 3/4 in.
4 sheets/box

Step 2 Complete!

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

Additional Downloads