How is drip edge measured?
Measuring the run
- Measure each eave, the level bottom edges, along the fascia.
- Measure each rake, the sloped gable edges, along the slope, not the horizontal distance.
- Add them for total linear feet.
Aerial measurement reports used by roofers and adjusters list eaves and rakes separately, which makes this simple.
Converting to pieces
Each 10-foot piece covers about 9 feet 10 inches once you allow the code-required 2 inch overlap. Divide total linear feet by that coverage and round up, then add a few pieces for corner cuts and mistakes.
Sizing the profile
- Roof flange: the part that lies on the deck, which must extend at least 2 inches back onto the deck.
- Face: the vertical part over the fascia, ending in a drip lip that must extend at least 1/4 inch below the sheathing.
- Style: L-shaped, D-style with a kick-out, or gutter apron for eaves with gutters.
- Material and color: aluminum or galvanized steel, painted to match trim.
On an estimate
Contractor and insurance estimates usually list drip edge as a separate line priced per linear foot, sometimes split between eaves and rakes. Because the residential code requires drip edge on shingle roofs, it belongs on a replacement estimate even if the old roof never had it. If your estimate leaves it out, ask why. See how roofers measure a roof and drip edge explained, and for insurance, code upgrades and ordinance or law coverage.