I want to lay 18mm thick h/wood flooring but don't want to lay directly onto the old floorboards ..not wanting to raise the floor level by 20mm or more. If I remove the floorboards and put 12mm thick ordinary chipboard ..is this not strong enough and too prone to dampness even though there is no dampness in this part of the house?
I know I can use 12mm ply but want to keep the cost down.
Thanks.
Arthur