markiespud

Thanks for all the replies everyone and I have ordered a VCL in the form of Tyvek Airguard reflective, whilst I have your attention can you let me know what fixings you used through the insulation ? I have tried Helifix but they will not go over 200mm fixings unless I specifically say that I don't want them to take into account for roof weight/ slippage and I need 225mm as I need to go through the batten/ pir and 16mm sarking into the rafter... I cannot see that thermal bridging will be a problem with 150mm pir, can I use something like this : https://www.efixings.com/6mm-structural-wood-screws-tx-star-flange-head-zinc/?variant=20160 Thanks again

Koramic old hollow pantiles Dan, any help appreciated ! Mark

Thanks everyone ! In terms of air tightness it should be pretty good as it's a Isotex icf which will be membraned on the inside (passive purple or parged). It's not our first rodeo but this is my first warm roof and for obvious reasons It needs to be right... Thanks Marvin, I did email the BI and hopefully will hear back next week. I will have a look at the Alutrix Gus, thanks !

Hi everyone I am at a bit of a stumbling block on our roof, we are building/ part renovating an old barn and putting in a warm roof. Our roof makeup is basically tiles/ batten/ membrane/ batten/ 150mm pir then a sawn timber board (cosmetic) and finally open joists. My question is (despite numerous searches) do I need a vcl or vcb under the pir as it is already foil faced and a vcl will not be able to breath and the foil is already a vpb.... Can anyone advise me ? Thanks