plywood thickness for stud wall in bathroom Information, help and tips on many areas of roofing including trusses, tiling, venting, insulation etc....

[rose]

What thickness of plywood should i get if the stud wall in bathroom is being fully tiled and the floor
thanks

[stoneyboy]

rose,
Are you refering to the floor or walls and will the wall form part of a shower?
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[rose]

[quote="stoneyboy"]rose,
Are you refering to the floor or walls and will the wall form part of a shower?
end[/quote]

hi stoneyboy

the walls and floor are being fully tiled
and the shower has 2 stud walls (side) and the back wall is brick

[stoneyboy]

rose,
strongly reccomend you use an eternit waterproof board or something similar, for backing the shower walls. If you are boarding the floor use 18mm on floorboards or 25mm if straight on joists.
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[rose]

hi stoneyboy
you mentioned eternit waterproof board

'an eternit waterproof board or something similar'

what is this and where can I get it?
many thanks

[rosebery]

You should not use plywood as a substrate for wall tiling except in small areas - too much scope for movement. Then only use WPB grade.

Use plasterboard for the non-permanent wet areas. For the area around the shower either plasterboard OR aquapanel and tank the area as well.

How thick are the existing floorboards? I'm guessing probably 18mm. If you use 18 WPB ply on top plus the adhesive/tile depth (say another 12mm) you'll have an inch step up into the bathroom. It's better to replace the boards in the areas you are tiling with 25mm as suggested above (use WPB) and I'd consider using a decoupling membrane as well.

[stoneyboy]

rose,
My local builders merchant stocks the eternit board for shower walls, you may find it called aquapanel or something similar.
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