I’d like to remove carpet in a bedroom, and install a 14mm thick engineered oak floor instead. (The floor boards will have a multi-ply core, like these ones).
Between the chipboard subfloor and the new floor boards, should I use a rigid underlayment (e.g. plywood sheet)? If so, how thick should the plywood sheets be?
Or, is some foam underlayment (rather than plywood) enough?
The house was built 12 years ago. The floors seem flat.
The chipboard subfloor panels are in good condition and are generally level, except that some panels are 2mm higher than the next panel. Some nail heads protrude from the subfloor by 1mm.
The floor subfloor doesn’t currently creak in the bedroom I want to install the new floor in. But it does creak in another part of the house.
I haven’t yet decided whether the new floor boards will attach using a click system, or use tongue-and-grooves and nails into the subfloor.
At my local floorboard store, I was told that a rigid underlayment wasn’t needed, and a 3mm flexible underlayment would be enough. But I’m reading different things in different articles online.
If I didn't add an underlayment at all (i.e. if I added the new floor boards directly on top of the subfloor), the new floor would be exactly flush with the floor of the corridor leading to it. So any millimetre of underlayment thickness creates a difference in height between the room and the corridor.
Thanks a lot for your advice!