By The Roofing Brief Team. Last reviewed: October 2026.
Drip edge is the metal flashing installed at the eaves and rakes of a roof to direct water away from the fascia and into the gutter rather than letting it wick back under the lowest shingle course. The drip edge code, IRC R905.2.8.5, has required it at the eaves and gables of shingle roofs since the 2012 International Residential Code, per the ICC’s 2012 IRC Significant Changes, which notes it “was not previously required” for asphalt shingle installs unless the shingle maker’s instructions called for it. Adding drip edge during a reroof costs $1.50 to $3.00 per linear foot installed, versus $5 to $9 to retrofit it on an existing roof, per HomeGuide (November 2025). It also protects the eave against ice dam backup when paired with an ice barrier.
The short version
- Drip edge is corrosion-resistant metal flashing at the eaves and rakes that throws water past the fascia and into the gutter or off the rake.
- IRC R905.2.8.5 has required drip edge on shingle roofs since the 2012 IRC: 2-inch laps, 1/4 inch below the sheathing, 2 inches up the deck, fasteners at 12 inches on center maximum.
- Cost runs $1.50 to $3.00 per linear foot installed during a reroof and $5 to $9 per foot as a retrofit, per HomeGuide (Nov 2025).
- The three standard profiles are Type C (L-style), Type D (T-style, the most common) and Type F (extended, also called gutter apron), per IKO and HomeGuide.
- Aluminum and galvanized steel are the standard materials; IKO and HomeGuide both say plastic or vinyl drip edge is meant for doors and windows, not roof edges.
- Under the IRC: eave drip edge goes under the underlayment, rake drip edge goes over it. Florida’s residential code reverses the eave rule and asks for 3-inch laps.
The Short Answer: What It Does + Code Requirement
Without drip edge, water running off an asphalt shingle roof has two paths: down the front face of the shingles into the gutter (the intended path), or wicking back under the shingle by surface tension and capillary action onto the top of the fascia (the failure path). The Asphalt Roofing Manufacturers Association (ARMA) says the drip edge’s lower edge, or kickout, ensures water is directed away from running onto the supporting wood. Wicked water that reaches the fascia top edge can run back into the soffit cavity and the lowest course of roof sheathing.
Drip edge interrupts the wicking path. Under IRC R905.2.8.5 (2021 edition), it must extend not less than 1/4 inch below the roof sheathing and not less than 2 inches back onto the roof deck, with adjacent pieces lapped not less than 2 inches. ARMA’s guidance matches: at least 2 inches onto the sheathing and at least 1/4 inch below it.
The code change matters. Before the 2012 IRC, drip edge on asphalt shingles was required only where the shingle maker’s instructions called for it. States and cities adopt IRC editions on their own schedule and sometimes amend them, so check which edition your building department enforces before assuming the 2021 text applies.
IRC R905.2.8.5 Code Requirements (Since the 2012 IRC)
The 2021 IRC text reads: “A drip edge shall be provided at eaves and rake edges of shingle roofs. Adjacent segments of drip edge shall be overlapped not less than 2 inches (51 mm). Drip edges shall extend not less than 1/4 inch (6.4 mm) below the roof sheathing and extend up back onto the roof deck not less than 2 inches (51 mm). Drip edges shall be mechanically fastened to the roof deck at not more than 12 inches (305 mm) o.c. with fasteners as specified in Section R905.2.5. Underlayment shall be installed over the drip edge along eaves and under the drip edge along rake edges.”
| Code requirement | IRC 2021 specification | Section |
|---|---|---|
| Locations | All eaves and rake edges of shingle roofs | R905.2.8.5 |
| Minimum overlap between pieces | 2 inches | R905.2.8.5 |
| Minimum extension below sheathing | 1/4 inch (creates the drip lip) | R905.2.8.5 |
| Minimum extension up the deck | 2 inches | R905.2.8.5 |
| Fastener spacing | 12 inches on center maximum | R905.2.8.5 |
| Fastener type | Galvanized, stainless, aluminum or copper roofing nails, 12-gauge (0.105 in) shank, 3/8 in head, ASTM F1667, at least 3/4 in into sheathing | R905.2.5 |
| Metal flashing thickness | Corrosion resistant, not less than 0.019 inch (No. 26 galvanized sheet) | R903.2.1 |
| Order at eave | Underlayment over the drip edge | R905.2.8.5 |
| Order at rake | Underlayment under the drip edge | R905.2.8.5 |
The IRC does not name a separate ASTM product standard for drip edge; the material rule comes from R903.2.1, which requires metal flashing to be corrosion resistant and at least 0.019 inch thick. Some jurisdictions are stricter than the IRC minimum, most visibly Florida (see below). See Florida roofing contractor license for the licensing context that goes with the stricter code, and best roof for hurricane for the broader hurricane-zone considerations.
Florida and High-Wind Rules That Differ From the IRC
The Florida Building Code, Residential (2023, 8th edition) rewrites R905.2.8.5. It requires a 3-inch lap, an eave drip edge that extends 1/2 inch below the sheathing, drip edge installed over the underlayment, and a 4-inch strip of roof cement over the drip edge flange or the self-adhering underlayment. Fasteners go at 12 inches on center, tightening to 4 inches on center where the design wind speed (Vasd) is 110 mph or more or the mean roof height exceeds 33 feet.
| Rule | IRC 2021 | Florida Residential 2023 |
|---|---|---|
| Lap between pieces | 2 in minimum | 3 in minimum |
| Eave extension below sheathing | 1/4 in minimum | 1/2 in |
| Extension onto deck | 2 in minimum | 2 in minimum |
| Eave order | Underlayment over drip edge | Drip edge over underlayment; self-adhering ASTM D1970 may go over a primed flange |
| Sealant | Not specified | 4 in of roof cement over the flange or the self-adhering underlayment |
| Fastener spacing | 12 in o.c. maximum | 12 in o.c.; 4 in o.c. at Vasd 110 mph or more, or mean roof height over 33 ft |
Drip Edge vs Rake Edge (Eave vs Gable Application)
Drip edge has two roles, and the installation order differs at each.
At the eave (the horizontal lower edge of the roof where the gutter sits), drip edge directs water into the gutter and protects the fascia top edge. At the rake (the sloped edge along the gable end), it directs water off the rake and protects the rake fascia and barge board. HomeGuide prices dedicated rake edge or gable flashing at $3.00 to $5.50 per linear foot installed, against $1.50 to $3.00 for standard drip edge in a reroof.
The order of installation flips between the two locations under IRC R905.2.8.5. At the eave, drip edge goes on first, directly on the sheathing, and underlayment laps over its top flange, so water on the underlayment drains onto the metal, not behind it. At the rake, the underlayment goes down first and the drip edge goes over it, so the metal flange caps the underlayment edge against wind-driven rain.
The mnemonic is “eaves under, rakes over,” and ARMA gives the same general guideline. ARMA notes one exception: where self-adhering underlayment is used at the eave, some shingle makers and local codes permit the drip edge over it, in which case ARMA describes first installing a 12-inch strip of self-adhering underlayment so the drip edge is sandwiched between two plies.
Profiles: Type C (L-Style), Type D (T-Style), Type F (Gutter Apron)
| Profile | Shape | Best for | Material price per LF (HomeGuide) |
|---|---|---|---|
| Type C (L-style) | Bent to 90 degrees with a lower flange | Low-pitch or commercial roofs; often formed on site | $0.50 to $1.00 |
| Type D (T-style, “D-metal” or “drip metal”) | T-shape with a lower flange that holds water further from the fascia | Most residential shingle roofs; ARMA prefers it over Type C, per IKO | $0.50 to $1.00 |
| Type F (F-style, gutter apron) | Extended, longer leading edge that reaches into the gutter | Retrofits over existing shingles, rakes, and eaves behind gutters | $0.75 to $2.50 |
Type D is the most common residential profile and is sold in 10-foot pieces, per HomeGuide; IKO’s drip edge guide says pieces are generally 10.5 feet, occasionally 8 feet. Type F’s longer leading edge is why it is the usual retrofit choice: it can slide under the first shingle course and still reach past the fascia. HomeGuide prices installed gutter apron at $2.00 to $5.00 per linear foot.
Material Options: Galvanized Steel, Aluminum, Copper, Vinyl
| Material | Material price per LF | Spec guidance | Source |
|---|---|---|---|
| Aluminum | $0.50 to $1.00 | Does not corrode; sold in colors; not as strong as steel | HomeGuide; IKO |
| Galvanized steel | $0.50 to $1.25 | Must be galvanized; minimum 24-gauge preferable for wind | HomeGuide; IKO |
| Copper | $4.00 to $9.50 | Minimum 0.69 mm or 20 oz | HomeGuide; IKO |
| Plastic or vinyl | $0.50 to $1.00 | Intended for doors and windows, not roof edges | HomeGuide; IKO |
| Any metal (code floor) | n/a | Corrosion resistant, at least 0.019 in (No. 26 galvanized) | IRC R903.2.1 |
IKO says plastic, vinyl and fiberglass drip edges are best suited to non-roofing applications such as above doors and windows, and HomeGuide says the same. Because IRC R903.2.1 sets the metal flashing floor at 0.019 inch corrosion-resistant metal, ask your building department before accepting a vinyl drip edge on a shingle roof.
Aluminum vs Steel: The Best Choice for Most Homes
Aluminum and galvanized steel cost about the same, $0.50 to $1.00 versus $0.50 to $1.25 per linear foot for material per HomeGuide, so the choice comes down to environment and stiffness. IKO notes aluminum does not corrode and is sold in colors that match the home, but is not as strong as steel. Near salt air, aluminum avoids the cut-edge rust that bare galvanized steel can show.
Galvanized steel’s advantage is stiffness: IKO recommends a minimum of 24-gauge steel so the drip edge withstands strong winds, which matters on long eaves and in heavy-snow zones where the edge can flex under load. Its weakness is the zinc coating at cut edges and fastener holes, so it suits dry inland climates better than coastal or high-humidity ones. Whichever metal you pick, match the nails to it to avoid galvanic corrosion: R905.2.5 allows galvanized steel, stainless steel, aluminum or copper roofing nails.
Copper is reserved for architectural homes and historic restorations where the patina is part of the look. At $4.00 to $9.50 per linear foot for material per HomeGuide, copper costs roughly 4 to 19 times aluminum’s $0.50 to $1.00, and IKO calls for at least 20 oz (0.69 mm) copper. It pairs with copper gutters, copper standing seam roofs, or slate. See metal vs asphalt shingle roof for the broader metal roof context.
Color Selection: Match Fascia or Roof?
Drip edge is visible from the ground along every eave and rake. The two standard approaches are matching the fascia color, so the drip edge disappears into the trim, or matching the roof color, so it extends the roof line. Aluminum drip edge is commonly sold prefinished in colors that match the rest of the home, per IKO.
Match the fascia when the trim is white or a contrasting body color and the gutter sits directly below the drip edge, because the two read as one band. Match the roof on metal roofs, or when the roof color is the dominant element. For a custom color, PVDF (Kynar 500) coated steel or aluminum offers the widest palette; check the coil maker’s written fade and chalk warranty rather than a sales sheet.
Installation Order: Underlayment First or Drip Edge First?
This is the question that defines a correct installation. The IRC rule is location-specific:
- At the eave: Drip edge first, then underlayment over the top flange, per IRC R905.2.8.5. In ice-barrier areas, the self-adhering membrane laps over the drip edge flange the same way.
- At the rake: Underlayment first, then drip edge over the underlayment, per IRC R905.2.8.5. The drip edge top flange caps the underlayment edge along the gable.
- In Florida: Drip edge over the underlayment at the eave too, with 4 inches of roof cement over the flange, per Florida Residential R905.2.8.5.
Getting the eave sequence backward lets meltwater from an ice dam run between the underlayment and the drip edge flange onto the sheathing. ARMA’s 12-inch self-adhering strip under the eave drip edge exists for exactly that ice-dam backup case. Damage from a reversed lap is hidden under the first shingle course, so check the sequence before shingles go on. For the underlayment that pairs with it, see felt vs synthetic underlayment.
Eave Installation: Under the Underlayment
The IRC eave installation sequence:
- Inspect the fascia and the sheathing edge for rot; replace soft wood before any metal goes on.
- Lay the first piece along the eave with the flange flat on the sheathing (at least 2 inches onto the deck) and the drip lip at least 1/4 inch below the sheathing.
- Fasten through the top flange at 12 inches on center maximum (IRC) or 8 to 10 inches (ARMA’s guideline), never through the vertical face.
- Lap the next piece at least 2 inches (3 inches in Florida). At corners, miter or wrap the drip edge to keep a continuous water-shedding line.
- Where an ice barrier is required, install the self-adhering membrane over the drip edge flange, then the underlayment.
- Set the starter course to the shingle maker’s overhang spec; the 2012 IRC text allowed shingles flush with the drip edge unless the manufacturer specified otherwise.
In areas with a history of ice damming (designated in IRC Table R301.2), IRC R905.1.2 requires an ice barrier from the lowest roof edge to a point not less than 24 inches inside the exterior wall line. Drip edge plus that ice barrier plus underlayment is the code-minimum eave assembly in those areas. Our guide to the ice dam protection membrane code covers when that requirement applies.
Rake Installation: Over the Underlayment
The IRC rake installation sequence:
- Lay the underlayment over the sheathing, including the rake area, letting it run 1 to 2 inches past the rake edge.
- Trim the underlayment flush with the rake edge.
- Install the rake drip edge over the underlayment, flange at least 2 inches onto the deck and drip lip at least 1/4 inch below the sheathing.
- Fasten through the top flange at 12 inches on center maximum (8 to 10 inches per ARMA).
- Lap each piece at least 2 inches, with the upper (ridge-side) piece over the lower one.
The rake-to-eave corner is the detail most worth checking. The sequence is eave drip edge first, then underlayment, then the rake drip edge lapped at least 2 inches over the eave drip edge at the corner, so the rake piece is the top layer where water leaves the roof. Our drip edge installation detail lays out the full eave and rake sequence.
Overlap Requirements (2-inch Minimum)
The IRC sets a 2-inch minimum lap between adjacent drip edge pieces; Florida’s residential code raises it to 3 inches. With 10-foot pieces, each piece covers 9 feet 10 inches at a 2-inch lap and 9 feet 9 inches at a 3-inch lap, so a 150-foot perimeter needs 16 pieces before waste either way; the Florida lap costs almost nothing extra.
Overlap orientation follows water flow: on a rake, the piece closer to the ridge laps over the one below it, the same shingle logic used for underlayment and shingle laps. ARMA adds that 8 to 10 inch nail spacing applies through the laps as well as the field of each piece.
For high-wind detailing beyond the drip edge, including Florida’s 4-inch fastener spacing at 110 mph Vasd, see best roof for hurricane.
Fastener Pattern
The IRC maximum is one fastener every 12 inches along the top flange; ARMA’s guideline is 8 to 10 inches on center, and Florida requires 4 inches on center where Vasd is 110 mph or more or the mean roof height exceeds 33 feet. Use roofing nails that meet R905.2.5 (12-gauge shank, 3/8-inch head, ASTM F1667) in a metal compatible with the drip edge: aluminum or stainless nails in aluminum, galvanized or stainless in galvanized steel, copper in copper.
Each nail should penetrate at least 3/4 inch into the sheathing, or through it where the sheathing is thinner than 3/4 inch, per R905.2.5. Set the pneumatic nailer so the head sits flush; an overdriven nail dimples thin aluminum and leaves a low spot where water collects.
Never nail through the vertical face or the kickout. ARMA says not to nail into the vertical portion of any drip edge, because those holes sit outside the underlayment and become water entry points.
Common Installation Mistakes
| Mistake | Rule it breaks | Consequence |
|---|---|---|
| Eave drip edge installed over the underlayment (outside Florida) | IRC R905.2.8.5 | Water on the underlayment can run behind the flange onto the sheathing |
| Rake drip edge installed under the underlayment | IRC R905.2.8.5 | Underlayment edge exposed to wind-driven rain at the gable |
| Less than 2-inch lap at joints | IRC R905.2.8.5 (3 in in Florida) | Wind-driven water enters the joint |
| Drip lip less than 1/4 inch below sheathing | IRC R905.2.8.5 | Water can wick back to the sheathing edge and fascia |
| Vinyl drip edge on a shingle roof | IRC R903.2.1 metal flashing floor; IKO and HomeGuide guidance | Possible inspection failure |
| Mismatched nail metal (steel nails in copper, for example) | R905.2.5 nail types | Galvanic corrosion at every fastener |
| Nails through the vertical face | ARMA guidance | Holes outside the underlayment |
| No drip edge at rakes (only at eaves) | IRC R905.2.8.5 | Rake fascia and sheathing edge exposed |
Most of these mistakes are hidden once the first shingle course is down, so they rarely show at a final inspection viewed from the ground. Fixing one later means lifting the first 2 or 3 courses of shingles, which is why HomeGuide’s retrofit price ($5 to $9 per linear foot) runs about 3 times the reroof price.
| If your situation is | Then | Threshold or rule |
|---|---|---|
| Reroofing a shingle roof | Install new Type D drip edge at all eaves and rakes | IRC R905.2.8.5; $1.50 to $3.00/LF installed |
| Shingles with 10+ years left and fascia damage now | Retrofit Type F drip edge under the first course | $5 to $9/LF installed (HomeGuide) |
| Reroof due within about 5 years and no active rot | Wait and add drip edge with the reroof | Saves about two-thirds of the per-foot cost |
| Florida home, Vasd 110 mph or more or roof over 33 ft | 3 in laps, 1/2 in drip lip, fasteners 4 in o.c. | Florida Residential R905.2.8.5 |
| Ice-dam area per Table R301.2 | Ice barrier over the eave drip edge, 24 in inside the wall line | IRC R905.1.2 |
| Coastal or salt-air site | Aluminum, or copper on architectural work | Avoids cut-edge rust on galvanized steel |
Drip Edge Cost: $1.50 to $3/LF in a Reroof, $5 to $9/LF as a Retrofit
Standalone drip edge retrofit (adding drip edge to an existing roof without a reroof) costs about 3 times as much as installing it during a roof replacement, per HomeGuide, because the crew must lift and reseal the lowest shingle course. HomeGuide’s labor split is $1 to $2 per linear foot during a reroof versus $3 to $7 for a retrofit, depending on whether bottom shingles need replacing.
| Project type | Cost per LF installed | Typical total | Source |
|---|---|---|---|
| Drip edge during roof replacement | $1.50 to $3.00 | $150 to $600 (100 to 200 LF) | HomeGuide, Nov 2025 |
| Drip edge on an existing roof | $5.00 to $9.00 | $500 to $1,800 (100 to 200 LF) | HomeGuide, Nov 2025 |
| Gutter apron (Type F) | $2.00 to $5.00 | $200 to $1,000 | HomeGuide, Nov 2025 |
| Rake edge or gable flashing | $3.00 to $5.50 | $300 to $1,100 | HomeGuide, Nov 2025 |
| Worked example: 150 LF in a reroof | $1.50 to $3.00 | $225 to $450 | 150 x HomeGuide range |
| Worked example: 150 LF retrofit | $5.00 to $9.00 | $750 to $1,350 | 150 x HomeGuide range |
HomeGuide puts fascia and soffit replacement at $9 to $34 per linear foot, so on a home with active fascia rot and many years of shingle life left, a $750 to $1,350 retrofit on 150 feet is cheaper than replacing 150 feet of fascia and soffit ($1,350 to $5,100). See how much does a new roof cost for the broader reroof budget and gutter installation cost for the related gutter pricing.
Manufacturer Warranty Connection
IRC R903.1 requires roof assemblies to be installed in accordance with the code and the approved manufacturer’s instructions, and shingle warranties are written around those instructions. Before the 2012 IRC, drip edge was required only when the shingle maker’s instructions called for it, so read the drip edge and starter-course section of your shingle’s printed application instructions and keep the invoice line showing drip edge was installed.
Enhanced system warranties add a contractor requirement: GAF’s Golden Pledge is offered only through GAF-certified contractors, and Owens Corning’s Platinum Protection only through its Platinum Preferred contractors. Ask the contractor which warranty level they will register and whether the maker’s inspection covers the eave and rake details.
For the broader certification framework, see how to choose a roofing contractor and signs you need a new roof. For the related flashing systems that work with drip edge, see roof flashing and parts of a roof.
Frequently asked questions
What is drip edge?
Drip edge is corrosion-resistant metal flashing installed at the eaves and rake edges of a roof to direct water away from the fascia and into the gutter. Under IRC R905.2.8.5 it extends at least 1/4 inch below the sheathing and 2 inches onto the deck, so water drops off the metal instead of wicking back under the lowest shingle course.
Is drip edge required by code?
Yes, where your jurisdiction has adopted the 2012 IRC or later. IRC R905.2.8.5 requires drip edge at the eaves and rake edges of shingle roofs, with 2-inch laps and fasteners at 12 inches on center maximum. Florida’s residential code requires 3-inch laps and, in high-wind areas, fasteners at 4 inches on center.
What is the difference between eave and rake drip edge installation?
Under the IRC, at the eave drip edge goes on first (directly on the sheathing) and underlayment laps over the top. At the rake, underlayment goes down first and drip edge is installed over it. The mnemonic is “eaves under, rakes over.” Florida’s residential code puts the eave drip edge over the underlayment instead.
How much does drip edge cost?
During a reroof, drip edge runs $1.50 to $3.00 per linear foot installed, or $150 to $600 for 100 to 200 feet, per HomeGuide (November 2025). Retrofitting it on an existing roof runs $5 to $9 per linear foot because the crew must lift the lowest shingle course.
What material is best for drip edge?
Aluminum suits most homes: it does not corrode and costs $0.50 to $1.00 per linear foot for material per HomeGuide. Galvanized steel (24-gauge or heavier per IKO) is stiffer and suits dry inland climates. Copper (20 oz minimum per IKO) is for architectural and historic homes. IKO and HomeGuide say vinyl drip edge is meant for doors and windows, not roofs.
Can I install drip edge myself?
On new sheathing, drip edge is a manageable DIY step: 10-foot pieces, 2-inch laps, nails at 8 to 12 inches on center through the top flange only. Retrofitting under existing shingles means lifting and resealing the lowest course, and HomeGuide prices that labor at $3 to $7 per linear foot, so most homeowners hire it out.
What happens if I skip drip edge?
Without drip edge, water can wick back under the shingle onto the fascia top edge and the sheathing edge. On a reroof where the 2012 or later IRC applies, a missing drip edge is also a code violation an inspector can cite. Fixing fascia and soffit afterward costs $9 to $34 per linear foot per HomeGuide.