Plywood Overlay on Cement

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28 Nov 2020
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United Kingdom
Hi

I'm about to start laying 6mm ply over existing floorboards, fixing with 20mm screws. As its in 1 half ofa new extension there's smallish areas where cement or concrete has been used to level where the old external wall used to be. I dont think it's screed as the new built floor is still due to be screeded. The newly filled in areas are at the edge of a step so I can't span it with the boards.

I was wondering what the best way of tracking theae areas, glue? Screw with plugs into concrete?

How long should I leave to ensure the moisture is out or should I put down a vapor layer?

On a sidenote, I assume I need to let the boards get acclimatised with the heating on? Do replacement floorboards also need to get acclimatised?

Thanks
 
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