Vapour control layer (warm flat roof) dilemmas

17 Oct 2020
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United Kingdom
I thought that was going to be simple.

I went to two large roofing contractors this morning in search of a vapour control layer for my deck prior to adding the 150mm insulation (pir).

They literally have two types, flame on and flame off and both are felt based.

This flies in the face of what I'm learned over the last few weeks prior to roofing. I usually see vapour barriers seamed together (like the aluminium ones) and rolled in with rollers, usually with a primer underneath. Yet I'm turning up at these places and get offered essentially loose lay felt.

(It's for a warm parapet roof).

Can anyone explain what am I missing here?
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This might point you in the right direction for an appropriate product.

I got my chesterfoil (self adhesive) from eBay by the meter, bitumen primer (if required) from Toolstation.

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