Want to cover my very uneven floorboards, couple of questions. what thickness ply should I use ?, and do I need to pad out the uneveness with some underlay to stop the ply bouncing, and third - do I need an expansion gap around the the ply next to the wall ? thanks
1/2" works fine.
That depends on how uneven it is - up to say ~3mm you don't need to do anything, just screw the ply down well.
Ply is pretty dimensionally stable, you don't get much expansion, but I wouldn't butt the boards hard up against the skirting or wall - leave a
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