How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
How far should a metal roof overhang the drip edge?
Saturday, January 29, 2022
There is no code specification for how far a metal roof panel should extend past the drip edge in the International Residential Code (IRC). But all codes require following manufacturer’s installation instructions, and the typical manufacturer’s spec is 1.5 to 2 inches. This overhang is necessary to prevent water from rolling around the edge and turning back across the bottom of the metal due to surface tension.
But on roofs with a gutter, a shorter 1.25 to 1.5 inches is recommended. This is because water rolls down the smooth surface of a metal roof panel much faster than the textured surface of an asphalt shingle roof. And, if the slope is fairly low and the metal overhangs too far, the stream of water produced in a heavy rain can overshoot the gutter. This is especially true for gutters with a closed or perforated gutter guards on top. The PBR metal roof shown below had a 3.5” panel overhang and stains on the outside face indicate a long-term problem with water going over the edge.
• • • • • • • • • • • • • • • • • • • • • • • •
Here’s links to some of our other articles about METAL ROOFS and RAIN GUTTERS:
of Blog Posts
Top 5 results given instantly.
Click on magnifying glass
for all search results.
Buying a home in North/Central Florida? for a team inspection by two FL-licensed contractors and inspectors. Over 8,500 inspections completed in 20+ years. In a hurry? We will get it done for you.