A method for complex edges
This module's method, built from the sources in lessons 1 and 2: map every condition on the roof plan, check for a required fire parapet, get the wind demand by region from the engineer, choose a tested system whose published range covers your sizes, detail corners and ends, settle layers, movement and drainage, then review the submittal.
A vertical flow of ten numbered steps with the owner of each in a navy chip, ending in a red box reading fabricate to approved drawings, AFS.
- 1
- Map every condition on the roof plan: runs, corners, ends, steps, raked tops, scuppers, joints and appliances
- 2
- Check whether a fire parapet is required, and its height and noncombustible top
- 3
- Get the wind demand by region and the height basis from the engineer of record
- 4
- Choose a tested system whose published range covers the sizes drawn
- 5
- Detail corners, ends and steps with parts from the same system
- 6
- Settle the layers over the top: membrane under the coping, sealed nailers
- 7
- Coordinate movement joints with the masonry
- 8
- Drain the top and size any scuppers
- 9
- Keep appliances off the coping
- 10
- Review the submittal against all of this
Sources
- ANSI/SPRI/FM 4435/ES-1 Test Standard for Edge Systems Used with Low Slope Roofing Systems (2022, approved November 21, 2022) - SPRI
- ANSI/SPRI ED-1 Design Standard for Edge Systems Used with Low Slope Roofing Systems, proposed revision of October 2025 (a draft, not an approved edition) - SPRI
- 2021 Seattle Building Code, Chapter 7 Fire and Smoke Protection Features (section 705.11 Parapets); an adopted, IBC-based text, not the ICC model text - City of Seattle, Department of Construction and Inspections