Hip to gable conversion about 5 years ago, and now stripping back wallpaper on the old part of the gable wall to find blown plaster and damp just to the side of the 1st floor landing window (you can see area of skim that came off quite easily). Also found several spots of damp and peeling (new)paint in a couple other places on that wall at 1st floor height.
South facing wall. Original wall has a cavity, with the new gable built of timber on top. The render outside is not great, and has obviously had cracks repaired in the past. The conversion from hip to gable may be subjecting the wall to more rain than before. However given the cavity I am not sure how moisture is getting through at all.
Going in the cavity with an endoscope I can see one or 2 small bridges of mortar,
lots of retrofitted cavity ties, and this big black shiny thing across the cavity, projecting about cm or so wider than the window on either side (wider than the wooden beam). Looks like some sort of damp proofing but could it be channeling moisture across the cavity?
South facing wall. Original wall has a cavity, with the new gable built of timber on top. The render outside is not great, and has obviously had cracks repaired in the past. The conversion from hip to gable may be subjecting the wall to more rain than before. However given the cavity I am not sure how moisture is getting through at all.
Going in the cavity with an endoscope I can see one or 2 small bridges of mortar,
