CSA S502:21

1 Scope 1.1 General This Standard provides a) maintenance procedures to reduce snow overload risk on existing buildings; b) monitoring, detection, and assessment methods for snow load risks on buildings; and c) procedures for snow removal. A commentary to this Standard is provided in Annex A. 1.2 Exclusions This Standard does not address a) specific requirements for the design or construction of new buildings subjected to snow loads; or b) requirements for the structural rehabilitation or decommissioning of buildings subjected to critical snow overloading risks. Note: Although provisions in the building codes apply for new design, Annex G provides supplementary background information on climate change and its implications on the design and retrofit of buildings. 1.3 Terminology 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 (non-mandatory) to define their application.