A few weeks ago we started work on our 1960s lean to extension. So far walls have been taken back to stone, rendered, tanked and new insulated floor has been laid. 2 of the walls are partly below ground level and old solid sandstone.
My builder was confident that tanking would ensure that dampness wouldn't get in but i've just returned after being away for 2 weeks and the lower 20-30cm of these walls is pretty damp. I know he applied 2 layers of the tanking slurry. One of the damp walls is going to have stud wall and insulation ontop but i'm worried about the possibility of damp building up behind this causing mould etc and also wondering what to do with the other wall. Any suggestions welcome.
My builder was confident that tanking would ensure that dampness wouldn't get in but i've just returned after being away for 2 weeks and the lower 20-30cm of these walls is pretty damp. I know he applied 2 layers of the tanking slurry. One of the damp walls is going to have stud wall and insulation ontop but i'm worried about the possibility of damp building up behind this causing mould etc and also wondering what to do with the other wall. Any suggestions welcome.