Thickness of Roof Sheathing Table 9.23.15.7.A. Forming Part of Sentence 9.23.15.7.(2) [mm]: Inche(s): = Table 9.23.15.7.A. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only. Similar articles Moisture Content (Lumber) Thickness of Interior Walls End Bearing Length of Joists and Rafters Securing of Tabs Asphalt Shingles on Slopes of 1 in 3 or Greater