Is drip edge required by code?

Yes for most new roofing installations per IRC R905.2.8.5. It may not be required for re-roofs in some jurisdictions but is strongly recommended.

Does drip edge go over or under the underlayment?

At eaves, drip edge goes on the deck UNDER underlayment. At rakes, it goes OVER underlayment. This is a common installation error.

What size drip edge do I need?

Standard 2x2 inch works for most residential applications. Use 4x4 inch where water volume is higher or gutters are not present.

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Roofing

Flashing

$1-$3 per linear foot

Drip Edge: Roof Edge Protection Flashing (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 15, 2026|Sources & methodology

Drip edge is an L-shaped or T-shaped metal flashing installed along the eaves and rakes of a roof to direct water away from the fascia and into the gutter. It prevents water from wicking back under the roofing and rotting the fascia board and roof deck edge. Code now requires drip edge on most new roofs.

Key Features

Directs water into gutters; Prevents fascia rot; L-shape and T-shape profiles; Aluminum or galvanized steel; Code-required on new roofs

Specifications

Width: 2x2 in to 4x4 in face. Length: 10 ft pieces. Material: aluminum (0.019 in) or galvanized steel (26 gauge). Colors: white

brown

black

mill finish.

Applications

Roof eaves; Roof rakes; Under shingles; Over gutters; New construction and re-roofs

Installation Overview

At eaves, install drip edge directly on the deck, then underlayment over it. At rakes, install underlayment first, then drip edge over it. Overlap joints 2 inches. Nail every 12 inches. Bend at corners or use pre-formed corners.

Pros & Cons

Pros

✓ Prevents water damage; Code-required; Inexpensive; Easy to install; Multiple color options

Cons

✗ Must be installed in correct sequence; Can bend if stepped on; Requires cutting at corners; Aluminum can oxidize; Must match roof color

Top Brands

Amerimax

Spectra Metals

Berger Building Products

Code Requirements

Required per IRC R905.2.8.5 for asphalt shingles. Must be corrosion-resistant metal. Install at eaves and rakes. Eave drip edge under underlayment; rake drip edge over underlayment.

Buying Tips

Buy pre-formed corner pieces if available to avoid complex bending. Color-match to your gutter system. Aluminum is easier to cut and bend than galvanized steel.