Wall Building Panels

Product information

wedi® Building Panels are needed for shower walls and combine a tile backer board and waterproofing into one step–providing a safe system installation.

They are the ultimate versatile wet room tile backer board, and often used within the range of wedi shower systems for walls, floors, countertops, and more. wedi® Building Panels can be applied either horizontally or vertically to shower walls and wet areas, which allows more flexibility with your wedi panel installation. The panels are fastened quickly and easily in place using wedi screws & washers. Once the panels are secured and seams & fasteners sealed with wedi® Joint Sealant, tiling can begin immediately after the sealant dries to the touch. This saves considerable time and money compared to traditional methods.

wedi® Building Panel has set the premium standard level for foam core tile backer boards because it is not only inherently waterproof and lightweight, but it also provides a perfect bond surface for tile setting and is a strong backing for the tile. Its solid waterproof core eliminates concerns like pinholes/voids and delamination typically associated with alternative waterproofing products. Seams, transitions, and fastener locations are prepared in a safe and waterproof manner without creating build up to ensure a great tiling experience and result.

The wedi® Building Panel has been successfully tested under ANSI 118.10 (test standard for load-bearing, bonded, waterproof membranes) as well as ASTM C578 (Standard Specification for Rigid, Cellular Polystyrene Insulation).

wedi® Building panels are:

  • For showers, tub & wet room walls and ceilings
  • Ready for tiling upon installation
  • 100% waterproof due to their extruded polystyrene (closed-cell) foam core
  • Easy and clean to cut to size using a utility knife, circular saw, or handsaw
  • Available in sizes and thicknesses that can accommodate different projects and applications
Ghost Accordion

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Building Panel Video
Installation Manuals, 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 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: 

  1. Calculate the total area of the shower wall
    1. Multiply L x H of the wall. The height of each wall will be determined based on how high you plan to install the tile
    2.  Add the calculated square footage of each wall together to determine the combined sum of all the shower walls
    3. Multiply the combined area of all shower walls by 1.15 to account for about 15% extra square feet of building panel for any waste cuts
  2. Divide the total area of the shower walls by the square foot area of the wedi building panels you plan to us4 (e.g. 4×5 ft. building panel = 20 square feet)
    1. 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.
    2. 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.

Main Application
Item Number
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
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
Constructing benches & Suspended seats, freestanding walls and partitions
48 in. x 60 in. x 2 in.
2 sheets/box
Constructing benches & Suspended seats, freestanding walls and partitions
48 in. x 60 in. x 5/8 in.
50 sheets/pallet
US8000021 (pallet)
Constructing benches & Suspended seats, freestanding walls and partitions
48 in. x 96 in. x 2 in.
12 sheets/pallet

Step 2 Complete!

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

Additional Downloads