(1) Vertical building assemblies that separate interior space from the ground are permitted to be dampproofed where,
(a) the building assemblies are not subjected to hydrostatic pressure,
(b) the substrate is cast-in-place concrete, and
(c) a drainage layer is installed between the building assembly and the soil.
(2) Joints, junctions and penetrations shall be designed and constructed to maintain the continuity of the dampproofing.