CSA A123.51-14 (R2023) PDF

This Standard provides minimum requirements for the application of asphalt shingles on roofs with a slope of 1:6 and steeper.

Portions of this Standard may not apply to laminated and/or dimensional shingles. The manufacturers of these shingles should be consulted for specific installation instructions.

Note: Annex A is included to provide recommendations for acceptable substrates for shingles; Annex B, recommendations for acceptable ventilation below the shingle substrate , and recommendations on the application of asphalt shingles over insulation; and Annex C, other precautions for shingle installation.