ASPE Announces Intent to Revise Siphonic Roof Drainage Standard In accordance with ASPE’s Procedures for Design Standard Development, ASPE announces the initiation of a project to revise ASPE 45: Siphonic Roof Drainage. Last revised in 2018, ASPE 45 is the only design standard that establishes the minimum performance specifications for siphonic roof drainage systems to help […]
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