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Thinking of having a 75mm cavity instead of 100mm for an extension wall; space is tight. Does anyone see any issues in doing this. I guess we would use 50mm kingspan and leave 25mm gap. Any issues with this approach?

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Thinking of having a 75mm cavity instead of 100mm for an extension wall; space is tight. Does anyone see any issues in doing this. I guess we would use 50mm kingspan and leave 25mm gap. Any issues with this approach?

Cheers
Won't that fall short of the .18 U value standard? You could do full fill instead.
 
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no idea tbh. wouldnt 50mm insulation be sufficient. think inspector is ok with it. what would be used for full fill?
 
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we had to use 90mm in 100mm cavity to meet the u value, with no additional insulation on the walls on the inside. build currently in progress.
 
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Actually this is a domestic extension, so its not .18. Its .28 I believe and in that respect, the u value can be met.
 

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