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Righto, thanks. My eaves don't overhang the exterior wall, so I assume putting some ventilation in the cavity provided by the dwarf wall will be OK? Re: air gap, spoke to Kingspan who said 50mm is required if membrane is not breathable. Any ideas if my membrane is breathable?

I *think* this is a membrane and not felt but I've never dealt with anything in the roof before so I'm unsure: There are a few vents in apex of the roof and some on the eaves: As for the longest unsupported length of rafter, it's about 200cm. The entire length of the rafter is...

Evening, I recently bought a house and the attic space has no insulation. It's been very sunny recently and the rooms have been scorching. In winter it's going to be cold! I've taken down the old lath and plaster and have ended up with this: The rafters are 60mm deep at 400mm centres...