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trying to achieve 0.15 in roof with 300mm high density fibreglass,0.15 in the walls with cavity insulation and drylining is there any advantage to 0.15 in the floor if i'm not going with underfloor heating?it would need 125mm of insulation but my builder tells me 100mm would be still very good and that the extra price of the 125mm wouldnt warrant it.he's not buying ,just laying it by the way so he should have no issues just his opinion