Division B
Acceptable Solutions

Part 5 — Environmental Separation

Section 5.8. Moisture in the Ground

5.8.1. Foundation and Floor Drainage

5.8.1.1. Required Drainage

1) Except where a wall or floor is subject to continuous hydrostatic pressure, or unless it can be shown to be unnecessary, the bottom of every exterior foundation wall and every floor-on-ground shall be provided with drainage. (See Appendix A.)

5.8.1.2. Drainage Materials and Installation

1) Drainage shall be specified and installed to accommodate the drainage load.

5.8.2. Protection from Moisture in the Ground

5.8.2.1. Required Moisture Protection

1) Except as provided in Sentence (2), where a building element separates interior space from the ground, materials, components or assemblies shall be installed to prevent moisture transfer into the space.

2) Materials, components or assemblies need not be installed to prevent moisture transfer from the ground where it can be shown that such transfer will not adversely affect any of

a) the health or safety of building users,

b) the intended use of the building, or

c) the operation of building services.

5.8.2.2. Protective Material and Component Properties

1) Except where it can be shown that lesser protection will not lead to adverse conditions, or as provided in Article 5.8.2.3., materials and components installed to provide required moisture protection shall conform to the requirements of this Article.

2) Except as provided in Sentences (3) and (7), materials installed to provide the required moisture protection shall be capable of bridging

a) construction, control and expansion joints,

b) junctions between different building assemblies, and

c) junctions between building assemblies and elements penetrating building assemblies.

3) Except as provided in Sentence (7), where the material installed to provide the required moisture protection is not capable of bridging construction, control and expansion joints, those joints shall be designed to maintain the continuity of the moisture protection.

4) Materials and components installed to provide the required moisture protection shall have sufficiently low water permeance to resist moisture loads.

5) Except as provided in Sentence (7), moisture protection shall be designed and constructed to resist design hydrostatic pressures determined in accordance with Section 4.2.

6) Except as provided in Sentence (7), materials covered in the scope of the standards listed below shall not be installed to provide the required resistance to moisture transfer:

a) CGSB 37-GP-6Ma, “Asphalt, Cutback, Unfilled, for Dampproofing,” or

b) CGSB 37-GP-18Ma, “Tar, Cutback, Unfilled, for Dampproofing.”

7) Where the substrate is cast-in-place concrete, and a drainage layer is installed between the building assembly and the soil, and the assembly will not be subject to hydrostatic pressure,

a) materials and components installed to provide the required resistance to moisture transfer need not conform to Sentences (2), (3), (5) and (6), and

b) materials covered in the scope of the following standards are permitted to be installed to provide the required resistance to moisture transfer where those materials conform to the requirements of the standards:

i) CGSB 37-GP-6Ma, “Asphalt, Cutback, Unfilled, for Dampproofing,” or

ii) CGSB 37-GP-18Ma, “Tar, Cutback, Unfilled, for Dampproofing.”

(See Appendix A.)

5.8.2.3. Installation of Moisture Protection

1) Except as provided in Sentence (2), where materials are installed to provide the required resistance to moisture transfer and their installation is covered in the scope of the standards listed below, installation shall conform to the waterproofing requirements of the respective standards:

a) CAN/CGSB-37.3-M, “Application of Emulsified Asphalts for Dampproofing or Waterproofing,”

b) CGSB 37-GP-36M, “Application of Filled Cutback Asphalts for Dampproofing and Waterproofing,”

c) CGSB 37-GP-37M, “Application of Hot Asphalt for Dampproofing or Waterproofing,” or

d) CAN/CGSB-37.51-M, “Application for Hot-Applied Rubberized Asphalt for Roofing and Waterproofing.”

2) Where the substrate is cast-in-place concrete, and a drainage layer is installed between the building assembly and the soil, and the assembly will not be subject to hydrostatic pressure

a) materials and components installed to provide the required resistance to moisture transfer and whose installation is covered in the scope of the standards listed in Sentence (1), are permitted to be installed in conformance with the dampproofing requirements of the standards listed in Sentence (1), or

b) materials installed to provide the required resistance to moisture transfer and whose installation is covered in the scope of the standards listed below, shall be installed in conformance with the requirements of the respective standards:

i) CGSB 37-GP-12Ma, “Application of Unfilled Cutback Asphalt for Dampproofing,” or

ii) CAN/CGSB-37.22-M, “Application of Unfilled, Cutback Tar Foundation Coating for Dampproofing.”

(See A-5.8.2.2.(7) in Appendix A.)