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Also, some people seem to use rock wool and some PIR boards, is there a better option?
Yes, Kingspan, but we decided that Rockwool suffice as the house is a terraced type and can't afford to spunk that much more.
Yeah I've watched that series and he does add a vapour barrier
That been done to our too, between the rockwool and floorboard.
edscoble
Okay that makes sense. No I was more thinking around whether you'd need to add another layer to prevent condensation etc ...
Also, some people seem to use rock wool and some PIR boards, is there a better option?