CSA Group Asphalt shingle application on roof slopes 1:6 and steeper

Preface This is the first edition of CSA A123.51, Asphalt Shingle Application on Roof Slopes 1:6 and Steeper. It combines CSA CAN3-A123.51-M, Asphalt Shingle Application on Roof Slopes 1:3 and Steeper, and CSA CAN3-A123.52-M, Asphalt Shingle Application on Roof Slopes 1:6 to Less Than 1:3. It supersedes the second editions, published in 1985, of the two separate standards. It forms part of the series of CSA Group Standards on bituminous roofing materials (A123.1-M through A123.52-M) and is written in SI (metric) units. This Standard also supersedes the previous (Imperial) editions published in 1965. Scope 1.1 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. 1.2 The application of this Standard requires a working knowledge of applicable federal, provincial, and local building codes and regulations specifically concerning installation of asphalt roofing shingles. This Standard does not purport to address all building code requirements. For further requirements, the local authority having jurisdiction should be consulted. 1.3 In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.