DIY-Dafydd

Mhmm I better speak to the supplier as my wall insulation is then being plastered so It would have to remain on that side. Unfortunately, my stack is already getting thick so OSB isn't an option!

Hi all, I've been scouring the web and this forum for answers but can't seem to find it for my situation. Im about to start a barn conversion of an old stone barn with 480mm walls and will be reslating the roof. The plan is to insulate over the rafters only as 1) I hate cutting PIR and 2) my rafters are only 3" so there isn't much usable space for insulation anyway. The build up is: Natural slate 25x50 Batten Membrane - Novia Black+ 38x50 counter batten secured through with helical screws 130mm PIR AVCL - Im thinking Novia VC2 Rafters. Which will be my service void for cables and ducting 12.5 Wood fibre board & clay plaster. Walls are 80mm wood fibreboard and clay plaster What I cant seem to figure out is how my AVCL goes from being on top of the rafters to below it, and does it need to continue above for the full rafter length? It would be best if it can go the full length externally to weather roof the barn from wild Welsh weather. Diolch