Vapour control layer (warm flat roof) dilemmas

[Wockawocka]

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.

Chesterplus 3H - Chesterfelt Group

www.chesterfelt.co.uk

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?

 

[blup]

This might point you in the right direction for an appropriate product.

Blup

 

[cdbe]

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

 

[datarebal]

Nothing wrong with a torch on 2mm as a vcl.
It's not loose lay