epsilonGreedy Posted September 19, 2021 Share Posted September 19, 2021 There seems to be a growing shortage of 1.5m wide roofing membrane with very little available from the top quality brand names such as Tyvek's supro plus. The 185 grams per m2 green roof shield used on most small development near me is not available in 1.5m and neither is Glidevale's VP400. I can get hold of Klober's Forte membrane at 1.5m wide, this is only 145 gsm but claims to have an extra 4th layer of grid reinforcement. Klober https://klober.co.uk/storage/download/klober-membrane-guide-2021-web.pdf The same supplier also offered Permavent Apex claiming all the big sites have gone over to Apex. I have a 185gsm sample and it is very strong but disconcertingly it is both vapour and air permeable and it is easy to suck air through the sample sheet. I suppose the mass house builders like using an air permeable membrane because a still wet fast build can be made weather tight and then continue to shed moisture through an air permeable roof membrane while the house dries out. Link to comment Share on other sites More sharing options...
nod Posted September 19, 2021 Share Posted September 19, 2021 Klober is good it doesn’t really matter what Tge mass house builders use A house is often completely covered and tiled in within two days Using quick cheap interlocking tiles Unlike most of us using lead and slate 1 Link to comment Share on other sites More sharing options...
PeterW Posted September 19, 2021 Share Posted September 19, 2021 Cromar is just as good - and about 2/3rd price of the others. Link to comment Share on other sites More sharing options...
Thorfun Posted September 19, 2021 Share Posted September 19, 2021 my understanding was that the benefits of an air permeable roof membrane like the Tyvek Supro is that it allows you to remove the need for the air gap between the insulation and the roof battens as long as you have counter battens in place. that way you can fully fill your rafters with insulation. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted September 19, 2021 Author Share Posted September 19, 2021 1 hour ago, PeterW said: Cromar is just as good - and about 2/3rd price of the others. You are right about the price, I would save £150 even with their top-end 165 gsm Vent Pro. Trouble is even roofing super store has this on a 1 month lead time. Link to comment Share on other sites More sharing options...
PeterW Posted September 19, 2021 Share Posted September 19, 2021 19 minutes ago, epsilonGreedy said: You are right about the price, I would save £150 even with their top-end 165 gsm Vent Pro. Trouble is even roofing super store has this on a 1 month lead time. Think BC Profiles stock it - give them a call. https://www.bcprofiles.co.uk/products/cromar-vent-3-pro-heavy-weight-breathable-membrane-1-5m-x-50m?variant=41015876419747 Link to comment Share on other sites More sharing options...
Dave Jones Posted September 19, 2021 Share Posted September 19, 2021 our local jewsons had loads of tyvec when i was in yesterday. Link to comment Share on other sites More sharing options...
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