We are pleased to announce that ASPE/ANSI 45-2025: Siphonic Roof Drainage was approved as an American National Standard by the American National Standards Institute (ANSI) on May 5, 2025.
ASPE/ANSI 45-2025 applies to engineered siphonic roof drainage systems intended to prime and operate full bore through proper pipe dimensioning and the use of siphonic roof drains. It establishes minimum performance specifications for systems, provides guidelines for inspection and testing, and describes the basis for the design of siphonic roof drain systems.
You can purchase your copy of ASPE/ANSI 45-2025 as an eBook from ASPE’s Bookstore.
Last updated in 2018, the standard went through an extensive revision process using ASPE’s ANSI-accredited standards development procedures to incorporate input from all facets of the plumbing design industry. Working Group 45 spent countless hours fine-tuning the standard based on public comments and input from ASPE’s Main Design Standards Committee to ensure that the standard meets current industry regulations. We thank the members of Working Group 45 for their hard work in revising this standard:
- Chair: Jay Stenklyft, UV-System Inc.
- Dennis Cavallaro, CPD, LEED AP, Southland Industries
- Brennan Doherty, MIFAB
- Peter Kraut, PE, South Coast Engineering Group Inc.
- Baalaganapathy Manohar, PE, CPD, LEED AP, SSOE Group
- John McNicol, Rainwater Technologies Ltd.
- John Rattenbury, PE, LEED AP, R. G. Vanderweil Engineers LLP
- Bill Ross, HydroMax Inc. Ltd.
- Christopher Rylant, Jay R. Smith Mfg. Co.
- David Weisz, PE, UV-System
ASPE has been an ANSI-accredited standards development organization since 2012. All ASPE standards are developed to be published according to our ANSI-approved Procedures for ASPE Design Standards Development. You can learn more about ASPE’s standards development program at aspe.org/publications-news/standards.
