Materials

Drip Edge Flashing: The Critical Part Between Roof and Gutter

Last updated: May 23, 2026 · Reading time ~5 min

Drip edge flashing is a metal strip installed under the bottom row of shingles that extends out over the back of the gutter. It directs water into the gutter rather than letting it slip behind. Required by the 2015 IRC and modern roofing codes — homes built before 2000 often don't have it.

What it does

Without drip edge, water trickling down the roof can wick under the shingle edge and run behind the gutter. Drip edge forces water to drop straight down into the gutter cavity.

How it works with gutters

Drip edge extends 0.5-1.0" past the back of the gutter, with the gutter back lip tucked under the drip edge. Together they form a continuous waterproof barrier from roof to gutter.

Older homes often missing it

Homes roofed before ~2000 in KC often lack drip edge. Adding it requires removing the bottom shingle row, which usually means doing it during a re-roof.

Frequently asked

Can drip edge be added without re-roofing?

Difficult but possible. Requires removing the bottom shingle row, sliding flashing in, and resealing.

Is drip edge the same as gutter apron?

Drip edge has a small angle at the bottom. Gutter apron is similar but with a longer leg that extends further into the gutter. Many crews use them interchangeably.

Will adding drip edge stop wall stains?

If wall stains are from water behind the gutter, yes. If from overflow, no.

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