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Floor Insulation

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NewhouseOldhouse

Joined
7 Jan 2011
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Ireland
Hi

I am converting a garage and my BC plans say that I need 150mm Kingspan floor insulation with dpc, membrane and 25mm edging then 75mm sand cement for floor.

I need 12 sheets (2400mm x 1200mm) and due to cost would it be OK to put down 75mm polystyrene boards then top with 75mm Kingspan floor insulation?

Any advice appreciated

Thanks
 

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