Hi, Just over a year ago, I laid a glueless click lock solid oak floor over 6mm ply screwed into floorboards. There is a 2mm foam underlay too. We are having a wall in between 2 rooms removed and I'd like to carry this flooring into new room. For reasons I won't get into (unless you really want to know) the subfloor in the 2nd room is 3mm higher (9mm ply onto floorboards). I need to lift the oak flooring up so a plumber can get under floorboards so it will all have to come up anyway, but to get room 1 level with room 2, I was planning on just screwing 3mm ply on top of the 6mm to get up to 9mm. Can anyone see a problem with doing this? I will do in such a way that the joints don't match up. I was also considering getting new fibre board underlay as i don't rate the foam. Could I leave the foam in place and sandwich between the 2 layers of ply to add a little more insulation? Many thanks,
I wouldn't use 3mm on top of 9, take up 9 and lay 12mm instead, with plenty of screws. I've never had any faith in laying solid oak as a floating floor, natural woods going to move, always glued the oak down to a firm base myself. But if you haven't had any problems or movement issues yet, and the manufacturers state it's ok, then it's your call as long as your happy. Just make sure you leave a good expansion gap around the perimeter of the floor, especially if you're laying it as one huge room without a dividing strip.
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