I’ve built a 3 story side extension which has been recently made watertight.
The walls are double skin concrete block with cavity filled with rock wool insulation battens. Recently I’ve noticed damp blocks on the first floor wall which seem to follow the laying order... the damp blocks are quite specific in layout but I can’t work out why they are damp... I’m assuming that if there was water ingress there would not be a defined pattern - which I am seeing. Does anyone have any ideas on this...can batches of blocks have a composition that can draw moisture from the air and exhibit this type of localised damp?
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!