(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,
(a) have its joints lapped not less than 300 mm, and sealed and weighted down, or
(b) be covered with a concrete skim coat not less than 50 mm thick.
(3) The perimeter of the ground cover required in Sentence (1) shall be sealed to the foundation wall.