airgap

Looking for some advice on roofing if I may: I’m building a cabin with cold roof in SW UK and concerned about the air gap between insulation and OSB deck. The roof comprises (inside to outside): 12mm Q mark plywood Thick vapour barrier (black DPM) that is fitted best I could but without butyl...

I'm looking to convert the existing cold roof in the kitchen to a pitched warm roof. Ceiling joists are already out and I'm moving on to putting in the roof insulation. Existing roof is 15 degree pitch with Sarking boards onto 150mm rafters. I understand the requirement for a 50mm air gap...