Drip Edge Calculator

Eave + rake linear feet and 10-ft stock pieces with 3-inch joint overlap — IRC R905.2.8.5 planning takeoff

Drip edge is the edge metal that protects the sheathing edge and kicks water into the gutter or clear of the fascia. This calculator adds eave and rake lengths, accounts for the code minimum 3 in end-joint overlap on 10-ft sticks, and flags a spare piece on longer runs. Some jurisdictions amend or delete R905.2.8.5 (Minnesota deletes it) — verify local code before you order.

Install order (eave vs rake): guide. Mistakes: troubleshooting. Aluminum vs galvanized: comparison. Shingles: shingle calculator. Hub: roofing calculators. Field underlayment: underlayment calculator.

Planning / estimating only — starting point, not gospel. Not a permit, not a substitute for the adopted code in your jurisdiction. 2018 IRC §R905.2.8.5 requires drip edge at eaves and rakes on asphalt-shingle roofs: minimum 1/4 in below the roof sheathing, minimum 2 in flange overlap onto the deck, minimum 3 in overlap at end joints, fastened at maximum 12 in on center. Some jurisdictions amend or delete this section locally — Minnesota’s state amendment deletes R905.2.8.5 entirely (Minn. Admin. R. 1309.0905 subp. 2). Verify what your AHJ actually enforces before you order material or pull a permit. This tool sizes lineal footage and 10-ft stock pieces; it does not design flashing details or approve an install.

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How to Use This Drip Edge Calculator

Add up every eave that gets drip edge and every rake/gable edge. Enter optional corner/transition counts so you remember short cuts. The calculator sums linear feet, divides by 9.75 ft of usable coverage per 10-ft stick (10 ft minus the 3 in IRC end-joint overlap), rounds up, and recommends one extra piece when the total run is over ~40 ft.

Pieces = ceil( (eave + rake) / 9.75 ) · Buy +1 when total > ~40 ft

Install order and R905.2.8.5 specs: guide. Mistakes: troubleshooting. Aluminum vs steel: comparison. Shingle field: shingle calculator.

What This Number Is (and Is Not)

The piece count is a lineal takeoff for the eaves and rakes you typed, with stock sold in 10-ft pieces and a 3 in joint overlap baked into usable coverage. It is not a flashing detail drawing. It is not proof that your jurisdiction still requires drip edge (Minnesota deletes R905.2.8.5). It is not the gutter or ice-&-water takeoff.

Why eave and rake both matter

Crews often metal the eaves and skip the rakes. IRC R905.2.8.5 names both. Wind-driven rain and underlayment lap direction also differ at the two edge types — that is why the guide spends time on install order.

Gutters change the fascia line.Drip edge that fights the gutter hanger or hangs into the trough is an install fight, not a calculator bug. Size the trough with the gutter calculator and dry-fit the metal.

Need shingle squares next?Edge metal and field coverage are different worksheets.

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Drip Edge & Edge-Metal Gear

A linear-foot takeoff is useless until you can cut, fold, and fasten edge metal. These are roofing-relevant tools already on the TestTalkHQ affiliate list — tin snips for field cuts, a seamer for hems, seam tape for transitions, and a coil nailer for deck fastening nearby.

Offset Aviation Snips

Malco M2006 left-offset snips for cutting aluminum or galvanized drip edge, rake returns, and short transition pieces without crushing the profile.

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Right-Cut Offset Snips

Malco AV73 long-cut right-offset snips for the opposite hand/curve. Pair with left-offset so inside and outside corners cut clean.

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3" Hand Seamer

Malco S2R hand seamer for folding hems and dressing cut ends so the drip edge sits tight to fascia and deck without a wavy lip.

View on Amazon →

Malco TS1 TurboShear sheet metal attachment

TurboShear Attachment

Malco TS1 drill attachment for long straight cuts in edge metal when you are trimming stock 10-ft sticks down for rake returns.

View on Amazon →

Butyl Seam Tape

Cofair Quick Roof butyl seam tape for sealing transitions at valleys, walls, and where drip edge meets ice & water or underlayment details.

View on Amazon →

Roofing square shingle bundle calculator

Shingle Takeoff Next

Drip edge is edge metal. Squares and bundles are a different worksheet — run the shingle calculator for the field.

Open Shingle Bundle Calculator →

As an Amazon Associate, TestTalkHQ earns from qualifying purchases. No dedicated “drip edge stock” or coil-roofing-nailer SKU was on the live affiliate CSV for this page — snips, seamer, TurboShear, and butyl tape are the roofing-relevant hand tools that matched.

Drip Edge Calculator

How to Use This Drip Edge Calculator