A Guide to Siphonic Roof Drainage

Recorded On: 08/08/2019

This one-hour webinar sponsored by MIFAB discusses the benefits of using siphonic drainage vs traditional gravity. Attendees will be able to understand a new method of roof drainage that utilizes smaller diameter pipe running with no pitch, a more efficient roof drain which leads to an overall safer roof with less penetrations, and lastly a look at how to utilize siphonic drainage to be compliant with changes to code regarding sizing the roof drain based on GPM. 

Content Outline:

  • What is siphonic roof drainage?
  • Gravity drainage shortcomings
  • Benefits of siphonic roof drainage
  • Reason for codes governing siphonic roof drainage
  • Rules of thumb when designing siphonic roof drainage
  • How to effectively apply the codes

By the end of this webinar, attendees will be able to understand the value a siphonic system can bring to their project - not only the monetary value, but also the improved efficiency/safety it brings to the building.


Instructor: Brennan Doherty

Brennan Doherty, National Specifications Manager for MIFAB HydroMax, was responsible for helping introduce Siphonic Roof Drainage into the newest ASPE Plumbing Engineer Design Handbook V2. In his role, Brennan is responsible for educating owners, design build contractors, and engineers across the country on both the technical and cost savings benefits of Siphonic Roof Drainage.

This webinar is sposnored by MIFAB and is free for ASPE members. 


The sponsor receives attendees' names and email addresses for those that sign up for the live webinar.

To register for this webinar sign in using your ASPE Connect account (top right) and proceed. Questions? Contact education@aspe.org


08/08/2019 at 1:00 PM (CDT)   |  60 minutes
08/08/2019 at 1:00 PM (CDT)   |  60 minutes
Learning Assessment
5 Questions  |  3 attempts  |  4/5 points to pass
5 Questions  |  3 attempts  |  4/5 points to pass
Post-webinar Survey
6 Questions
6 Questions Extra notes for PEs: Are you a PE in any of the 50 states, specifically New York, North Carolina, Floria, Michigan, or Ohio? If so, please complete the form below for your records. This form is in addition to completing the learning assessment (quiz) to comply with your states' PDH requirements and ASPE certifications. ASPE carefully reviews all submissions received in order to incorporate changes to our programs. If a speaker did not meet attendees' needs or the description did not match the program adjustments will be made. For example: if the program as it was presented was different than advertised ASPE will revise the course description and/or remove the course from our catalogue depending on the circumstance. All course materials, program evaluations, and applicable data are kept on file at ASPE for a minimum of 6 years.
0.10 CEUs credits  |  Certificate available
0.10 CEUs credits  |  Certificate available
North Carolina PE Evaluation
9 Questions
9 Questions Please complete this if you hold a PE license in NC.