Some years ago I over layed my lounge subfloor with 6mm ply with correctly centered screws. Prior to fixing gripper - u/lay - stretch carpeting: resulting in an unsatisfactory finish -`rippled` `pie crust` effect around edge of the room. Reason being, on closer inspection, the ply had contoured to the `cupped` floorboards pulling the gripper down with it. Additionally, when the house was constructed the joiner I believe hasn`t packed out floor joists to level. My budget is tight, so my remedy is:- 1. Leave ply in situ, cut a channel Round perimeter of room approx. 32mm wide. 2. Drop in 32mm x 12mm x 3metre softwood timbers screwed. 3. Nail gripper on top. 4. Then underlay with `Cloud` 12mm PU. Note: where gripper & u/lay meet heights will be as normal In my view, with a solid baton round the edge & thick u/lay, finish should be fine, views opinions appreciated. Thanks! (See my drawing)
It may be a bit of fannying around but could you take up the ply (if it is screwed down), plane the floorboards level and then re-lay the ply? You should then have a level surface. But be warned - I do fit other materials but I don't fit carpets so someone on here might shoot me down!
I would rip out and screed with fibre rienforced , a cheap one , then relay . Out come would be perfect . After all it's carpet going down.
I agree with flooring man. Rather than plane each board tho I would drum sand the whole area of floor boards. They're available for daily hires for quite cheap. Good luck mate
plus cloud 9 don't do a 12mm underlay, plus anything over 9mm is daft anyway your carpet won't seat right on the gripper. For me i'd pull the ply plane the floorboards and sort out the reason they've cupped in the first place then re-ply with a 9mm rather than 6mm as the 6mm is rubbish at the mo.
