The Ontario Building Code | Exposure
9.26.9.6. Exposure
(1) The exposure of wood roof shingles shall conform to Table 9.26.9.6.
Table 9.26.9.6.
Exposure of wood Shingles
Forming Part of Sentence 9.26.9.6.(1)
| Item | Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 | Column 7 | |
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| Roof Slope | Maximum Exposure, mm |
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| No. 1 or A Grade Length of Shingle, mm | No. 2 or B Grade Length of Shingle, mm | |||||
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| 400 | 450 | 600 | 400 | 450 | 600 | |
| 1. | <1 in 3 | 100 | 115 | 165 | 90 | 100 | 140 | |
| 2. | ≥1 in 3 | 125 | 140 | 190 | 100 | 115 | 165 | |
In Plain Language
Wood shingles or shakes must be installed with the exposure (visible portion) set out in this article, balancing weather protection with material coverage.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.