Retaining walls
Retaining walls must be waterproofed on the inside, in contact with the ground, with a layer of tar extending up the full height of the wall. It is advisable to continue until the outside of the wall is reached, working horizontally until the coat is 3/4 the thickness of the wall, in order to also prevent infiltrations near the adhesive behind the wall covering.
The lack of suitable base waterproofing can lead to fairly serious surface dampness issues that can be difficult to treat.
