I’m currently building a lean to vaulted roof, and there will eventually be a stud wall under it, running parallel to the rafters. I was planning on putting a double rafter above where the wall will be, or noggins between 2 rafters, to screw the wall top plate to. But then thought There may be a cold bridge issue, am I better sandwiching 25mmcelotex between rafter and studwork? Any tips on how this is normally done much appreciated