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insulation

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viali | 18:45 Tue 17th Nov 2009 | Technology
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i am a builder and have realised that we have put a concrete oversite floor in too high !
does any one no of a floor insulation that is 25-35 mm thick that would give the same therm value as the 70mm celotex we forgot to account for ....please!!
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found something so laugh as much as you like thanks

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