Except where required by Section R406.2 to be waterproofed, foundation walls that retain earth and enclose interior spaces and floors below grade shall be dampproofed from the higher of (a) the top of the footing or (b) 6 inches (152 mm) below the top of the basement floor, to the finished grade. Masonry walls shall have not less than 3/8 inch (9.5 mm) portland cement parging applied to the exterior of the wall. The parging shall be dampproofed in accordance with one of the following:
- Bituminous coating.
- Three pounds per square yard (1.63 kg/m2) of acrylic modified cement.
- One-eighth-inch (3.2 mm) coat of surface-bonding cement complying with ASTM C 887.
- Any material permitted for waterproofing in Section R406.2.
- Other approved methods or materials.
Exception: Parging of unit masonry walls is not required where a material is approved for direct application to the masonry.