Is drip edge required by code?

Yes. The International Residential Code (IRC) requires drip edge on all asphalt shingle roofs. It must be installed at both eaves and rakes. Some local codes may have additional requirements, such as specific drip edge profiles or material gauges.

What size drip edge should I use?

Standard drip edge is "Type C" or "D-style" with a 1.5–2 inch face and 1.5–2 inch deck flange. For areas with heavy rain, "Type D" (or T-style gutter apron) provides a wider face to better direct water into the gutter.

Can I reuse existing drip edge?

It's not recommended. Old drip edge is often bent, corroded, or nail-perforated. New drip edge is inexpensive and ensures a clean, tight installation. Reusing old drip edge risks leaks at the most vulnerable edge of the roof.

How is drip edge installed at the eave?

At eaves, drip edge is nailed to the roof deck every 12 inches, then underlayment is installed over it. This ensures water that gets under the underlayment still drains over the drip edge into the gutter.

How is drip edge installed at the rake?

At rakes (gable edges), underlayment is installed first, then drip edge is nailed over the underlayment. Shingles extend 1/4–3/4 inch past the drip edge. This sequence is opposite to the eave installation.

What material is best?

Aluminum is the most common and economical choice. It won't rust and bends easily for custom fitting. Galvanized steel is stiffer and used where higher durability is needed. Copper is premium and long-lasting but expensive.

Drip Edge Calculator

Calculate drip edge flashing needed for eave and rake edges. Estimates pieces, linear feet, and total cost for metal drip edge roofing material.

Roof Length (ft)

Roof Width (ft)

Roof Pitch (rise per 12)

Drip Edge Material

Gutters Present?

Eave Length

100.00 ft

Both eaves (2 × building length)

Rake Length

67.1 ft

Both rakes adjusted for 6:12 pitch (×1.118)

Total Perimeter

167.1 ft

Eave + rake combined linear feet

Sections Needed

10-ft sections with 2″ overlap

Total Cost

$144.50

170 LF × $0.85/ft

Overlap / Waste

2.9 ft

Extra material from section overlaps and cuts

Total Weight

20.4 lbs

0.12 lbs/ft × 170 ft

Style Recommended

Type C (T-style)

T-style tucks under shingles and into gutter

Material Comparison

aluminum$0.85/ft · 30 yr life

galvanized$0.65/ft · 20 yr life

copper$3.50/ft · 50 yr life

vinyl$0.45/ft · 15 yr life

Drip Edge Material Specifications

Material	Cost/Ft	Weight/Ft	Section Length	Lifespan	Best For
Aluminum	$0.85	0.12 lbs	10 ft	30 yrs	Standard residential, lightweight
Galvanized Steel	$0.65	0.22 lbs	10 ft	20 yrs	Budget option, heavier duty
Copper	$3.50	0.35 lbs	10 ft	50 yrs	Premium homes, patinas over time
Vinyl / PVC	$0.45	0.05 lbs	10 ft	15 yrs	Budget DIY, won't rust

Drip Edge Styles

Style	Profile	Use With Gutters	Description
Type C (T-Style)	T-shaped	Yes	Top flange under shingles, bottom lip into gutter
Type D (L-Style)	L-shaped	No	Extends past fascia board, directs water away
Type F (Gravel Stop)	F-shaped	Either	Extended flange, used on flat/low-slope roofs

Installation Tips

Step	Detail
1. Install eave edge first	Place under underlayment along all eaves before rakes
2. Overlap 2″ minimum	Overlap joints in the direction of water flow
3. Nail every 12″	Use roofing nails spaced 12 inches along the top flange
4. Rake edge over eave	Rake drip edge overlaps eave drip edge at corners
5. Bend at corners	Use tin snips and bend metal around corners for watertight seal
6. Seal with caulk	Apply roofing sealant at all joints and end points

Planning notes, formulas, and examples

About the Drip Edge Calculator

Drip edge is an L-shaped metal flashing installed along the eave and rake edges of a roof. It directs water away from the fascia board into the gutter, preventing rot and water damage to the roof deck edge. Most building codes now require drip edge on all new roofing installations.

Drip edge is sold in 10-foot sections and installed with a 2-inch overlap at joints. This calculator takes the total perimeter of eave edges plus rake edges and determines the number of drip edge pieces needed, accounting for the overlap at each joint.

Proper drip edge installation is one of the most cost-effective ways to protect a roof system. At just a few dollars per 10-foot section, it prevents thousands of dollars in fascia and deck rot damage.

When This Page Helps

Drip edge is inexpensive but often under-ordered. This calculator accounts for the 2-inch overlap at each joint and the different profiles sometimes used at eaves vs. rakes, giving an accurate piece count for your material list.

How to Use the Inputs

Measure and enter the total eave edge length (all eave edges combined).
Measure and enter the total rake edge length (all rake/gable edges combined).
The calculator assumes standard 10-foot pieces with 2-inch overlap.
Review the total linear feet and piece count.
Eave and rake drip edge may be different profiles — order each type separately.

Formula used

Effective Length per Piece = 10 ft − 2 in overlap = 9.833 ft
Eave Pieces = Eave Length / 9.833 (round up)
Rake Pieces = Rake Length / 9.833 (round up)
Total Pieces = Eave Pieces + Rake Pieces

Example Calculation

Result: 15 pieces

Eave: 80 / 9.833 = 8.14, round up to 9 pieces. Rake: 60 / 9.833 = 6.10, round up to 7 pieces. Total: 16 pieces of drip edge.

Tips & Best Practices

At eaves, drip edge goes UNDER the underlayment. At rakes, it goes OVER the underlayment.
Use hemmed drip edge (with a small folded lip) for added stiffness and a finished look.
Aluminum drip edge is standard for shingle roofs; galvanized steel is used for metal roofs.
At corners where eave and rake meet, fold and overlap the drip edge for a seamless joint.
Drip edge should extend at least 1/4 inch past the fascia into the gutter.
Color-matched drip edge (brown, white, black) improves aesthetics for a few cents more per piece.

Eave vs. Rake Drip Edge

Some roofers use different drip edge profiles at eaves and rakes. At eaves, a gutter apron (T-style) extends further into the gutter. At rakes, a standard L-style or C-style is sufficient. If you use different profiles, order each type separately.

Installation Sequence

The installation sequence is critical: 1) Drip edge at eaves, 2) Underlayment over eave drip edge, 3) Drip edge at rakes over underlayment, 4) Ice and water shield over drip edge at eaves. This layered approach ensures water always flows outward.

Maintenance

Drip edge requires no maintenance once installed, but it should be inspected during re-roofing. Look for corrosion, denting, separation from the fascia, or gaps at joints. Any damage should be corrected during the new roofing installation.

Sources & Methodology

Last updated: February 8, 2026

Frequently Asked Questions

Yes. The International Residential Code (IRC) requires drip edge on all asphalt shingle roofs. It must be installed at both eaves and rakes. Some local codes may have additional requirements, such as specific drip edge profiles or material gauges.