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CAN3 A123.51-M85(R2011)
New product
CAN3 A123.51-M85(R2011)
Asphalt Shingle Application on Roof Slopes 1:3 and SteeperMore info
This PDF includes GI #2.1. Scope1.1This Standard describes the minimum application requirements for asphalt strip shingles on roofs with slopes 1:3 and steeper. Note:Roof Substrate and Ventilation Below Substrate.Appendix A is included to provide recommendations for acceptable substrate for shingles; Appendix B, recommendations for a cceptable ventilation below the shingle substrate; and Appendix C, recommendations on the application of asphalt shingles over insulation.