Dampproofing and Waterproofing

1807.2.2.1, Surface Preparation of Walls

Prior to the application of dampproofing materials on concrete walls, holes and recesses resulting from the removal of form ties shall be sealed with a bituminous material or other approved methods or materials. Unit masonry walls shall be parged on the exterior surface below ground level with not less than 0.375 inch (9.5 mm) of Portland cement mortar. The parging shall be coved at the footing.

Exception: Parging of unit masonry walls is not required where a material is approved for direct application to the masonry.

Interpretation of the Code

This section states that the wall must be free of all voids, openings, cracks, honeycombs, fissures and other imperfections prior to the application of the dampproofing material.

Concrete walls can be repaired using bituminous materials or other products approved by the material manufacturer.

Masonry walls must be parged below-grade level on the exterior surface using not less than 0.375 inch (9.5 mm) of Portland cement. The only exception is if the dampproofing material is approved for application directly to the masonry.