CSA CAN/CSA-A123.21-14

Abstract

This test method determines the wind uplift resistance of membrane-roofing systems when subjected to dynamic wind load cycles. The test methods are applicable to <br>a) mechanically attached membrane roofing systems; and <br>b) adhered membrane roofing systems. <br>The roofing system consists of a deck and roofing membrane. It includes components such as vapour barriers or retarders, insulation, cover board, etc. It is subjected to a dynamic load sequence that has been developed based on wind pressure records, simulating the effects of wind on membrane-roof assemblies. <br><strong>Note</strong>: <em>The roof membrane may be designated as the plane of air tightness.</em> <br>The following limitations apply for the test methods in this Standard: <br>a) Method 1: Testing in accordance with this test method is limited to mechanically attached membrane roofing systems having a fastener row separation not greater than 2896 mm (114 in) and fastener in-line spacing not greater than 610 mm (24 in). <br>b) Method 2: Testing in accordance with this test method is limited to adhered membrane roofing systems. <br>The values given in SI (metric) units are the standard. The values given in parentheses are for information only. <br>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. <br>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. <br>Notes to tables and figures are considered part of the table or figure and may be written as requirements.