monsoon roof drainage design

The Hydrodynamic Spillway: Sizing Gutters and Detailing Drip Edge Overhangs for Monsoon Cloudbursts

• September 21, 2026
• admin

In steep-slope roof design, the primary focus is often keeping rainwater moving downward across overlapping shingles. However, once water reaches the perimeter of the roof, the envelope faces a critical hydraulic transition: transferring high-velocity sheet runoff safely into perimeter gutters without drenching the structural fascia or backing up beneath the eaves. During a typical Southwest …