Ply flooring

29 Sep 2009
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United Kingdom
I am in the midst of renovating my bathroom and need a decent floor. I am fitting a shower and want a perfect floor to fit the shower tray onto. I live in a first floor flat and the 110-year-old T&G floor boards are not exactly perfect. I plan to fit vinyl as the final floor covering and want to have vinyl in the hallway as well. The company that will supply and lay the vinyl have recommended laying 9mm ply over the old boards to give a level surface. That will be adequate in the hallway.

In the bathroom I’d like to take up the existing T&G and replace with a layer of 9mm ply, then a layer of 18mm ply (together these should match the existing 27mm T&G) then lay a final sheet of 9mm play over it all and extend this into the hallway so there is no joint at the door.

I have a few questions. Should I use pva glue between the layers of ply in the bathroom? I’ll screw the ply to each joist at 75mm centres.

In the hallway I thought of screwing the 9mm ply to the 27mm T&G with 35mm screws on a grid of about 150mm centres, does that sound acceptable?
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