Building a Seat Or Bench

Custom Shower Seats and Benches made easy and onsite from wedi Building Panel

wedi offers prefabricated seats and benches which can be quickly integrated into a shower system installation.

If a custom size is required for the seat or bench you can also use our thicker versions of the wedi building Panel, like our 2 inch thick panel, and safely build them on site.

Possible designs include suspended wall-mounted corner seats as well as benches which rest on the shower floor.

Using wedi panel allows you to build a seat or bench in a fraction of the time it takes to conventionally frame out a support, cover it with plywood and backer board, and then waterproof it. 

With wedi Building Panel all this is combined in one product that is shaped, installed and ready for tile. This process also allows the tile setter to build the seat or bench exactly fitting the final dimensions which are ideal for the individual tile layout and design.

The wedi Benches, whether prefabricated out of the box or built onsite, can handle the weight of tile and users. Based on models and designs, the load capability even before tile finish ranges between 250 pounds for onsite made wall suspended corner seats ( 350 pounds for the prefabricated wall suspended corner seats) to far over 500 pounds for the seats and benches which rest on the shower floor and can be attached to shower walls.    

Custom Corner Bench Installation

Ghost Accordion

Displays nothing

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)

Close Accordions

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.

Main application
Item Number
Constructing benches, floors to line up with Fundo Primo into bathroom
48 in. x 60 in. x 1 1/2 in. (1219 x 1524 x 40 mm)
2 sheets/box
Constructing benches and suspended seats, freestanding walls and partitions
48 in. x 60 in. x 2 in. (1219 x 1524 x 50 mm)
2 sheets/box
Constructing benches and suspended seats, freestanding walls and partitions
48 in. x 96 in. x 2 in. (1219 x 2438 x 50.8 mm)
12 sheets/pallet

Step 2 Complete!

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

Additional Downloads