The Ontario Building Code | Preservation Treatment of Wood Preservation Treatment of wood

(1) wood exposed to soil or air above the lowest anticipated groundwater table shall be treated with preservative in conformance with CAN/CSA-O80 Series, "wood Preservation", and the requirements of the appropriate commodity standard as follows:

(a) CAN/CSA-O80.2, "Processing and Treatment",

(b) CAN/CSA-O80.3, "Preservative Formulations", or

(c) CSA O80.15, "Preservative Treatment of wood for building Foundation Systems, basements and Crawl Spaces by pressure Processes".