cavity wall insulation

Joined
3 Sep 2014
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Bristol
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United Kingdom
hello, first post so be gentle, i am having a kitchen extension built and have been offered 8x4 polystrene sheets for nothing, can these be used in the cavity or does it have to be kooltherm ?
if not in the walls can they be put under the floor?
any ideas would be a bonus
thx
 
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You have been given them for nothing because they are pretty crap and not the same as your Kooltherm which is a PIR type insulation.

That said how thick are they? And what m2 is your extension?
 

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