9.13.3.

(1) Where hydrostatic pressure occurs, waterproofing is required for exterior surfaces of,

(a) floors-on-ground, and

(b) below ground walls, where the exterior finished ground level is at a higher elevation than the ground level inside the foundation walls.

(2) Roofs of underground structures shall be waterproofed to prevent the entry of water into the structure.

(1) Except as otherwise specified in this Section, materials used for exterior waterproofing shall conform to,

(a) CAN/CGSB-37.2-M, “Emulsified Asphalt, Mineral-Colloid Type, Unfilled, for Dampproofing and Waterproofing and for Roof Coatings”,

(b) CAN/CGSB-37.16-M, “Filled, Cutback Asphalt for Dampproofing and Waterproofing”, or

(c) CAN/CSA-A123.4, “Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems”.

(1) The method of application of all bituminous waterproofing materials shall conform to CAN/CGSB-37.3-M, “Application of Emulsified Asphalts for Dampproofing or Waterproofing”.

(1) Unit masonry walls that are to be waterproofed shall be parged on exterior surfaces below ground level with not less than 6 mm of mortar conforming to Section 9.20.

(2) Concrete walls that are to be waterproofed shall have all holes and recesses resulting from removal of form ties sealed with mortar or waterproofing material.

(3) The surface of insulating concrete form walls that are to be waterproofed shall be repaired and free of projections and depressions that could be detrimental to the performance of the membrane to be applied.

(1) Concrete or unit masonry walls to be waterproofed shall be covered with no fewer than 2 layers of bitumen-saturated membrane, with each layer cemented in place with bitumen and coated overall with a heavy coating of bitumen.

(1) Basement floors-on-ground to be waterproofed shall have a system of membrane waterproofing provided between 2 layers of concrete, each of which shall be not less than 75 mm thick, with the floor membrane mopped to the wall membrane to form a complete seal.