Hi,
I came across your post on the unvented cold roof - have you had any issues with it since? I'm in the same situation and trying to get an idea if it's safe to simply insulate fully and seal with VCL like you suggested building control were eventually happy with.
Many Thanks
Hi,
I've just come across a similar problem to this with our extension, where the BCO is happy with FV250 strips to provide ventilation, was he still happy with the drilling of the roof joists? It doesn't seem like a drastically different solution to the mushroom vents?