Assembly detail · Harrison, New York
Flat Roof Drain And Overflow Plan
Document primary drainage, overflow, and low areas.
Use five lines on the Flat Roof Drain And Overflow Plan decision sheet: primary drains and scuppers; secondary overflow path; taper, crickets, and low areas; edge and parapet details; safe maintenance access. Mark an unresolved Flat Roof Drain And Overflow Plan line as an exclusion, allowance, or unanswered question instead of hiding it. Stay on the ground or in a safely accessible interior area. Roof access, destructive inspection, and installation belong with qualified people using proper protection.
Planning factors
Five decisions worth documenting
Use the headings as a proposal check. The actions beneath them are specific to this project decision.
Primary drains and scuppers
Identify each primary drain, scupper, and outlet, including its condition and destination. Roof access and drain opening should remain with qualified people.
Secondary overflow path
Ask how overflow is managed if primary drainage is obstructed. The applicable code and property design determine requirements, not a general checklist.
Taper, crickets, and low areas
Have low areas, taper, and crickets documented during assessment. A replacement membrane alone may preserve an unresolved drainage pattern.
Edge and parapet details
Parapets, edges, and terminations need details that work with the drainage system. Water depth and edge conditions should be considered as an assembly.
Safe maintenance access
Provide safe maintenance access and a responsible inspection plan. Keep drain locations and service restrictions in the property record for later maintenance personnel.
Prepare the property
Keep these details on one sheet
- Primary drains and scuppers
- Secondary overflow path
- Taper, crickets, and low areas
- Edge and parapet details
- Safe maintenance access
Before authorizing work
What record belongs with “primary drains and scuppers” before work begins?
Request a dated description and the evidence supporting the proposed treatment. Cross-check entries: secondary overflow path; taper, crickets, and low areas. Named responsibility: edge and parapet details. Closeout file: safe maintenance access. Identity check for Flat Roof Drain And Overflow Plan: confirm the business, applicable County license, roofing insurance, and current Harrison permit steps separately.