Bathroom sub floor

padstar · 14 Dec 2021

Hi. Is 18mm plywood sufficient for a bathroom floor fixed to joists set at circa 380mm centers. I have a load of 18mm left over but wondering is 22mm neceserry.

Bathrooms will be overplayed with a decoupling layer before tiling

tell80 · 14 Dec 2021

18mm ply will be fine.
Just check for any sway or movement in the joists before fixing the ply.

padstar · 14 Dec 2021

Thanks. I stuck some extra noggins in there to stiffen it up. Feels very stable

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Bathroom sub floor

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tell80

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