Waterproof XPS tile backer
wedi boards
Just Wedi is the UK's licensed direct supplier of wedi boards. Waterproof XPS tile backer you tile straight onto, in 4mm to 20mm plus XL and XXL, for wet rooms, bathrooms and showers.
Choose a thickness
Pick a standard thickness below, or XL and XXL if you want longer sheets of the same board. The which thickness note covers walls, floors and underfloor heating in more detail.
Boards FAQ
Do wedi boards need tanking?
The XPS core is waterproof, so you are not tanking the whole face as you would with cement board, but you still seal every wet-area joint with wedi 610 and reinforcing tape, or with wedi 520 and sealing tape. wedi boards and tanking covers BBA 00/3675 and the cases where a spec still adds a membrane. Follow the current wedi UK instructions for showers and wet rooms.
Can I use wedi boards over underfloor heating?
4mm and 6mm boards are the usual overlay on floors, including over suitable underfloor heating, once the heating build-up is complete and sound. wedi PreLine boards take UFH pipes in the channels. Check the datasheet for the floor build-up before you order.
What stud centres do I need?
BBA Agrément Certificate 00/3675 (Issue 4, 31 July 2024) gives maximum unsupported spans of 300mm for 10mm boards, 400mm for 12.5mm, and 600mm for 20mm, with every board edge supported. The thickness guide has the full table, which you should confirm against the live datasheet for the thickness you are using.
When do I use wedi 610?
wedi 610 adhesive sealant bonds boards to timber or metal studs and, with reinforcing tape, seals joints in wet areas. Buy wedi 610 with the boards rather than a generic silicone. How to install wedi boards takes you through fixing, joints and tiling.
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wedi board
Price range: £29.95 through £187.54 plus VAT -
wedi PreLine board
Price range: £75.96 through £89.44 plus VAT -
wedi XXL board
Price range: £180.27 through £487.02 plus VAT -
wedi XL board
Price range: £113.99 through £382.47 plus VAT -
wedi Vapor board
Price range: £224.53 through £272.09 plus VAT