I have a situation with a damp wall and wonder if anyone has found a straightforward way to treat it.
A large floor area has been created by pouring concrete - I suspect without a membrane - onto which internal dividing walls have been built using cement concrete blocks (parpaing). The roof covering is good, but the whole ensemble is very damp (floors, walls etc); luckily the old house against which it is poured is coping with the additional ground moisture , but the walls are forcing the damp to migrate upwards and into the roof timbers....not good.
Is there a surface treatment (or invasive technique) which can be applied to these walls to help the moisture trapped in the concrete to dissipate to air? Would applying a surface coat of lime plaster or hemp-lime mix achieve a satisfactory result?
Thanks for any pointers.