S a plastering
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Mate of mine has done a loft con he says its noisy from rd traffic an wants blue boards on what's the best spec for this ie insulation resi bars cheers
soundproofing loft
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S a plastering
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Or would resi bars be needed
Builderboi
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100mm rock wool resi bars and two 12.5 mm blue board is what is normally specified to us
S a plastering
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Cheers pal is the rock wool ok in the roof void thought it had to keep an airflow or don't it matter
Builderboi
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Hmmmm how big are the rafters if you haven't got the space you'll either have to build on over the rafter (50mm in between and 50mm over) or speak to rock wool and get them to spec a higher density slab but thinner don't forget your thermal values
Builderboi
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Can be a right pain soundproofing in tight spaces so it might have to be a compromise
Builderboi
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Well as long as you meet the required u value don't think it makes any diff it's just u get more u value in a thinner sheet with celotex etc he could combine both even
TonyM
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Was only thinking about how the foil on the Celotex reflects the heat as opposed to absorbing it, making the roof space cooler. Been doing loft apartments with 2x140mm rock wool slab between trusses, and you can't live up there it's so hot.
Builderboi
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I've just done as I told lol but Yeh I can c that the actis muiltifoil stuff is great too at stopping solar heat gain
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