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Vapour check polythene membrane

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Simon_B_2 Posts: 519 Forumite

9 June 2018 at 2:33PM in In my home (includes DIY) MoneySaving

Hi,

We're constructing a new extension and have had a GRP roof fitted we now need to install the insulation I'm about to order celotex X4120 insulation for between the rafters but it states this needs void over vapour check polythene membrane.

What is this is it part of the celotex material or something separate?

Thanks

Simon

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Vapour check polythene membrane

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