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built in joist flexible sealant

paddyp · 2013-09-07 20:33:27

Trying to improve insulation in my house lifed the floor and discovered no insulation and massive gaps around all the built in joist ends (built 2006) :rolleyes: Part L and the acceptable construction detail say a 'flexible sealant' should be used, with the size of the gaps and awkward locations I can't imagine…

07-09-2013 8:33pm

#1

paddyp

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Join Date: June 2006

Posts: 1860

Trying to improve insulation in my house lifed the floor and discovered no insulation and massive gaps around all the built in joist ends (built 2006) :rolleyes:

Part L and the acceptable construction detail say a 'flexible sealant' should be used, with the size of the gaps and awkward locations I can't imagine retrofitting anything other than something like everbuild firefoam. I see there is a flexibl acoustic foam now too from geocel. Or should i try to stuff the gaps with fire rated rockwool. I'm pretty sure I read years ago that expanding foam was not to be used for this application was that for fire reasons?

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