We are in the middle of a rear extension, this has a warm roof. where the joists run over the external wall there was a gap between the insulation and the wall. i.e letting in cold air from the soffit, this would have been below the warm roof and above the plasterboard ceiling. I also had the same on the house side where the new build meets the old house and a cold roof. I have now sealed these gaps with celotex? basically I have sealed the new warm roof from cold ingress under it, is that correct? and also do I need to add a VCL to these parts as on the underside of the warm roof?
Thanks for the help
Thanks for the help