The Ontario Building Code | Ground Cover in Unheated Crawl Spaces

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,

(a) 50 mm of asphalt paving material,

(b) 100 mm of 15 MPa Portland cement concrete,

(c) Type S roll roofing, or

(d) 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.