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Bathroom Fitting

Sub floor for bathroom

I need to lay a subfloor on top of my exposed joists. what would people recommend?
1) 22mm marine ply
2) 22mm standard ply
3)18 mm marine ply
4)22mm green chipboard T&G
5) some bespoke product, like the Topps Tiles 22mm high density foam board (they claim it can go straight on joists with no ply underneath?

the room will be a wet room and the wet bits will be tanked, i'm also putting in noggins and doubling joists under the bath.

cheers in advance!!!!

2 Answers from MyBuilder Bathroom Fitters

22 mm marine ply, if you can get away with it in the door fresh hold as you don't want a step at door screw down marine ply up to shower tray or outlet ever 100mm into floor joists make sure you use a good tanking system to cover, area were is going to be exposed to water and use aqua board in shower area on walls anywhere else on walls use moisture resistant plasterboard hope this helps


Answered 29th Sep 2017

18mm marine ply should be ok as you don't want to build up the floor to high with exsisting levels, noggins should be placed under any joins not on joists to avoid any bounce- floor screwed at 300mm centers,might be advisable to use some insulation for sound deadening pumps etc,


Answered 29th Sep 2017

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