Just a question out of interest. I once got to look inside my western neighbors' place, a timber frame house (basically still in shell construction) with a watertight concrete basement and KS brick interior walls in the basement.
I didn’t see any bitumen membrane under the brick interior walls! Will this eventually cause problems for them? And if so, what kind?
As far as I understand, the state of the art for buildings with basements is a welded membrane in the basement at the first course of bricks and on the last course of bricks (for whatever reason?!) so under the ground floor slab.