I have stripped my kitchen floor back to a concrete slab covered with pitch about 75mm below the original finished floor level.
I intend to cover this with 50mm kingspan insulation, lay a floating floor and then tile.
What would you recommend for the floating floor?
I am worried that if I use P5 chipboard something like the washing machine flooding will make it swell.
Should I cover the chipboard with plywood?
Should I use plywood instead of Chipboard?
if I use Plywood it is not tongued and grooved so should I use 2 layers offset then screwed together?
I am not too worried about the thickness within reason.
Any other suggestions?