Gutter Glossary
Drip Edge
A roof flashing that extends past the roof edge and directs water away from the fascia and into the gutter. Required by most US building codes since the 2012 International Residential Code update.
What is a Drip Edge?
A roof flashing that extends past the roof edge and directs water away from the fascia and into the gutter. Required by most US building codes since the 2012 International Residential Code update. Drip edge is an L-shaped metal flashing (galvanized steel, aluminum, or galvalume) installed along the eaves and rakes of a roof.
Full Definition
Drip edge is an L-shaped metal flashing (galvanized steel, aluminum, or galvalume) installed along the eaves and rakes of a roof. At the eave, it sits between the roof deck and the underlayment, with its lower leg extending over — or slightly into — the gutter. Water running off the shingles drips from the nose of the drip edge directly into the gutter rather than wicking back under the shingles or running down the fascia.
The 2012 IRC (adopted at varying dates by California jurisdictions) made drip edge mandatory on new construction and reroofing permits. It must be installed at eaves before the underlayment and at rakes over the underlayment. In Sacramento County and most incorporated cities, building inspectors verify drip edge installation during roofing permit inspections.
Drip edge and gutter apron serve overlapping but distinct functions. The drip edge primarily protects the roof edge and underlayment; the gutter apron primarily bridges the gap between roof and gutter back lip to prevent behind-gutter water infiltration. On a complete eave assembly, both are present: drip edge at the roof edge, gutter apron bridging the gutter attachment point.
Also Known As
- drip cap
- eave drip
- roof drip edge
Related Terms
Gutter Apron
A piece of metal flashing installed under the roof shingles and over the back edge of the gutter that directs water into the gutter rather than behind it, preventing fascia rot.
Fascia Board
The vertical trim board running along the edge of the roof where the gutter is mounted. Usually wood, sometimes aluminum-wrapped. Rotted fascia must often be replaced before a new gutter installation can proceed.
Soffit
The horizontal panel underneath the roof overhang, often vented to allow attic airflow. Overflowing or leaking gutters can saturate the soffit, leading to rot, mold growth, and compromised attic ventilation.
Seamless Gutter
A gutter formed on-site from a single continuous coil of aluminum or steel, with no joints along the gutter run — only at corners and downspout outlets — which dramatically reduces leak points compared to sectional gutters.
Roof Valley
The internal V-shaped angle where two sloped roof planes meet, channeling water from a large combined roof area into a single concentrated flow that discharges into the gutter below — often a high-volume stress point requiring oversized downspouts or splash guards.
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