9.18.6. Ground Cover

9.18.6. Ground Cover
9.18.6.1. Ground Cover in Unheated Crawl Spaces
  1. Where a crawl space is unheated, a ground cover shall be provided consisting of not less than
    1. 50 mm of asphalt,
    2. 100 mm of 15 MPa Portland cement concrete,
    3. Type S roll roofing, or
    4. 0.10 mm polyethylene.
  2. Joints in sheet-type ground cover required in Sentence (1) shall be lapped not less than 100 mm and weighted down.
9.18.6.2. Ground Cover in Heated Crawl Spaces
  1. Where a crawl space is heated, a ground cover consisting of not less than 0.15 mm polyethylene sheet conforming to CAN/CGSB-51.34-M, "Vapour Barrier, Polyethylene Sheet for Use in Building Construction," shall be installed as part of an air barrier system in accordance with Subsection 9.25.3.
  2. The ground cover required in Sentence (1) shall have its joints lapped not less than 300 mm, and
    1. be sealed and evenly weighted down, or
    2. be covered with concrete not less than 50 mm thick.
  3. The perimeter of the ground cover required in Sentence (1) shall be sealed to the foundation wall. (See Notes A-9.13.4., A-9.25.3.4. and 9.25.3.6., and A-9.25.3.6.(2) and (3).)
  4. All penetrations of the ground cover required in Sentence (1) shall be sealed against air leakage. (See Subsection 9.25.3.)

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