What Is Drip Edge?
Drip edge is L-profile metal flashing installed along eaves and rakes that directs runoff off the roof edge and into gutters instead of wicking behind them into fascia boards and the outer inches of decking - the zone where hidden edge rot starts. Modern residential code (IRC-based, adopted across Central Texas jurisdictions) requires drip edge on asphalt shingle roofs, with sections overlapped a couple of inches; at eaves it goes under the underlayment, at rakes over it. The material cost is trivial - well under a dollar per linear foot for aluminum - which is exactly why its omission is a reliable tell of a corner-cutting installer, and several shingle manufacturers treat missing drip edge as grounds to limit warranty coverage. On insurance replacements it is a standard scope line item and, where an older roof lacked it, a legitimate code-upgrade addition. Aluminum drip edge typically lasts the full life of the roof.
Also Known As
These are the search terms and phrases that commonly refer to this topic, so you can find it however you describe it.
How Drip Edge Relates to Other Topics
Drip edge's whole job is to kick water past the fascia board; peeling paint or a rot line just below the roof edge usually means the drip edge is missing, short, or tucked behind the gutter instead of over it.
Drip edge must lap into the gutter, not behind it - water that runs behind the gutter travels down the fascia and into the soffit, and the roof gets blamed for a leak the gutter line caused.
Drip edge entered the residential code as a requirement in the 2012 IRC cycle, so many older roofs legitimately lack it - which is why it appears as a code-upgrade line item on replacements of older homes.
Related To Drip Edge
The starter course overhangs the drip edge by roughly a quarter to three-quarters of an inch to form the drip line; shingles cut flush with the metal wick water backward onto the fascia instead of dropping it clear.
Questions about Drip Edge?
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