What Is Drip Edge on a Roof? Purpose and Types
What is drip edge on a roof? Learn how this metal flashing guides water into the gutter, protects the fascia and deck, and how to check yours or add it.
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** It is a thin, bent strip of metal fitted along the roof's edges that guides water away from the fascia and into the gutter. Without it, water can curl under the shingle edge by capillary action and rot the deck, fascia and soffit. Many building codes now require drip edge, and it is a small part that protects a lot.
mall part that protects a lot.
What is drip edge on a roof: how it works
Water running off a roof edge tends to cling to the underside of shingles and flow back toward the wall. A drip edge has a projecting lip that breaks that path, so the water drips away from the fascia. At the eaves, the drip edge goes under the underlayment and over the fascia. At the rakes (the sloped sides), it goes over the underlayment.
| Quick facts: what is drip edge on a roof | |
|---|---|
| Material | Usually aluminum or galvanized steel |
| Where it goes | Eaves and rakes |
| What it protects | Roof deck edge, fascia, soffit and gutter area |
| Needed? | Often required by code; check local rules |
Types of drip edge
| Type | Profile | Use |
|---|---|---|
| Type C (L-style) | Short lip, simple L | Eaves and rakes; common |
| Type D (T-style) | Longer outward flange | Eaves; directs water farther |
| Type F (gutter apron) | Extends further, bends back | Eaves with gutters; directs water into the gutter |
| Rake edge | Matches the sloped edge | Rakes |
Colours and finishes can match the fascia or trim.
Why it matters
- Prevents rot. Water that gets behind the gutter can rot the fascia, soffit and deck edge.
- Stops pests. It closes a gap that insects and animals could use.
- Protects the shingles. It supports the shingle edge so it does not droop.
- Reduces ice and wind-driven rain problems at the edges.
- Code compliance. Many modern codes require it, and some shingle warranties assume it is installed.
How to check if you have drip edge
Look from the ground or ladder at the roof edge. You should see a thin metal strip under or over the shingles, with a small outward lip. If the shingles hang over bare wood or the edge looks bare, it may be missing. Stains or rot on the fascia below the shingles, or water running behind the gutter, suggest a problem.
Adding drip edge to an existing roof
It is easiest during re-roofing. On an existing roof, a roofer can slide drip edge under the lower row of shingles at the eaves, carefully lifting them, or fit a retrofit version. The work involves lifting shingles and fastening safely, so it is best done by a professional. If you ask what is drip edge on a roof because you saw rot behind the gutter, ask the roofer to check the edge.
Signs of a failing or missing drip edge
Look for peeling paint or dark stains on the fascia just below the shingle edge, wetness behind the gutter, soft or rotted fascia boards, shingles that droop over the edge, and rust streaks from old steel drip edge. Insects or birds nesting in the gap between shingles and fascia also suggest a missing edge. If you notice one or more, ask the roofer what is drip edge on a roof like yours, and whether it was installed originally.
Gutter apron or drip edge?
A gutter apron is a longer type of drip edge that reaches over the back of the gutter so water cannot run behind it. It suits gutters that sit tight to the fascia. Your roofer will choose the right profile.
When to call a professional
Call a roofer if you see rot, water behind the gutters, or bare roof edges.
What is drip edge on a roof: the function
What is drip edge on a roof? It is a metal strip along the eaves and rakes that directs water away from the fascia and into the gutter. The edge stops water from wicking back under the shingles and rotting the wood. What is drip edge on a roof used for in cold climates? It helps shed meltwater at the eave, reducing the chance of water running behind the gutter. Check that the drip edge sits under the underlayment at the eave and over it at the rake. A roofer who explains what is drip edge on a roof in plain terms can also show where it should sit.
Related reading
- Chimney Flashing Leak: How to Spot It and What Fixes It
- How to Prevent Ice Dams on Roof Edges: Insulate, Seal, Ventilate
- Granules in Gutters: Normal Wear or a Sign Your Roof Is Failing?
- When to Replace a Roof: 9 Signs and How to Decide
Browse all roofing guides, or find a roofer in your city from the roofing directory.
Frequently asked questions
What is drip edge on a roof?
It is a bent metal strip fitted along the eaves and rakes that guides water off the roof edge and away from the fascia and deck. It prevents water curling back under the shingles and causing rot.
Do I need drip edge on my roof?
Often yes. Many building codes require it, and it protects the deck, fascia and soffit from water. Check your local rules and your shingle warranty, which may assume it is installed.
Where does drip edge go?
At the eaves it goes under the underlayment and over the fascia, so water runs over it into the gutter. At the rakes it goes over the underlayment. A roofer will follow the correct sequence for your roof.
Can drip edge be added to an existing roof?
Yes, though it is easiest at re-roofing. A roofer can lift the lower shingles at the eaves and slide drip edge in, or fit retrofit pieces. Because it involves lifting shingles and working at height, hire a professional.
What happens if a roof has no drip edge?
Water can curl under the shingle edge and run behind the gutter, rotting the fascia, soffit and deck over time. It also leaves gaps for pests. The damage may not show until it is advanced.
What is the difference between drip edge and a gutter apron?
A gutter apron is a longer drip edge that extends over the back of the gutter so water cannot get behind it. It is useful where gutters sit tight to the fascia. A roofer can advise on the right profile.
What material is drip edge made from?
Usually aluminum or galvanized steel, sometimes copper, with a range of finishes and colours. Choose a material compatible with your gutters and flashing to avoid galvanic corrosion. Match the metal to your gutters.
When should I call a roofer about drip edge?
Call if you see rot or staining on the fascia, water running behind the gutter, bare roof edges, or if the roof is being replaced and you want to be sure drip edge is installed correctly.
Is drip edge required by code?
Many building codes require it on new roofs, and some do not. It protects the roof edge and fascia, so it is a good idea even where not required. Check with your local building department and ask your roofer to confirm what applies at your address.
What is the difference between eave and rake drip edge?
Eave drip edge goes under the underlayment on the lower edge to channel water into the gutter, while rake drip edge goes over the underlayment on the sloped sides. Installing it in the right order helps water run off and keeps wind-driven rain from getting under the shingles.
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