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Depends where you are.
But the floor insulation spec is a joke; wrong material (‘celotex’ type PIR insulation is a bitch to fit well between wonky old floor joists) and 50mm is way too thin to be doing much of anything. You want a minimum of 100mm PIR, or 150mm mineral wool/wood fibre/hemp etc.
You deffo want a vapour permeable airtight membrane underneath, and on top, of the insulation, taped to the edges with airtight tape. Without this, it won’t be airtight, and will get wind-washed, reducing its efficacy. If you’re going to the trouble of ripping up floorboards to insulate, get it done properly and never have to think about it again.
ectoplasmosis
@andyfallsoff
Not a full extension but getting a quote for work to a living room - floor sand, insulate underneath, plus some other bits. We've got the following quote but seems high to me, plus is celotex what we want under floorboards?
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