Drip Edge and Gutter Leaks: Why Water Gets Behind Gutters
Everything Gutter president Jimmy DeHart Sr. breaks down why water leaks behind gutters, the difference between fascia leaks and soffit leaks, and the simple fixes that solve both.
Water leaking behind a gutter is one of the most common complaints Jimmy hears from homeowners, and the root cause is almost always the same: the drip edge is not doing its job, or there is not one at all.
What a Drip Edge Does
A drip edge is a metal flashing strip installed along the roof edge, extending slightly over the back lip of the gutter. It catches water running off the shingles and directs it forward into the gutter trough. Without one, water can curl back under the shingle edge, slip behind the gutter, and run down the fascia instead of to the downspout.
Water does not fall straight off a roof edge like a waterfall. Even on a steep roof, surface tension makes some of it cling to the shingle and wrap around the edge, and the shallower the pitch, the stronger the effect. A drip edge breaks that surface tension with a clean metal edge the water cannot cling to, so it drops into the gutter.
Fascia Leaks vs. Soffit Leaks
Jimmy draws a critical distinction between two problems that look similar from the ground but have different causes and fixes:
Water running down the outside of the fascia behind the gutter is a drip edge problem.
Water dripping from the soffit under the eave overhang is a different problem: the gutter is installed too high on the fascia.
Why a Gutter Set Too High Causes Soffit Leaks
When the back of the gutter sits too high relative to the roof edge, it props the first shingle up. Instead of sloping down toward the gutter, the shingle creates a slight depression where water pools, works its way under the shingle and behind the drip edge, and drips out of the soffit. Over time it stains the soffit and can rot it.
Gutter guards can cause the same problem. Some guards slide under the first course of shingles, and if a guard is too thick or installed without adjusting the gutter height, it lifts the shingle edge just enough to create back-flow. Jimmy has seen working gutter systems develop soffit leaks right after guards were installed. The fix is resetting the gutter at the correct height so the shingle keeps its downward slope all the way to the drip edge.
When the Drip Edge Is There but Water Still Leaks
Jimmy describes a house with correct drip edge, the right roof angle, and water still getting behind the gutter. The drip edge had been installed flush against the fascia, tucked behind the gutter’s back lip instead of extending over it.
A drip edge has to project far enough that water falling from it clears the back of the gutter. The fix was bending the drip edge outward so it extended over the gutter’s back lip by a quarter to half an inch. Problems like this are invisible from the ground, so having a drip edge does not mean it is working; only a ladder inspection shows the details.
The Fastest Fix When There Is No Drip Edge
Many older homes have no drip edge at all. Jimmy offers two options:
The proper fix: have drip edge installed by lifting the first course of shingles and sliding the metal flashing underneath so it extends over the gutter.
The fast, inexpensive fix: run a bead of gutter sealant along the back edge of the gutter where it meets the fascia. It stops the leak immediately and can be reapplied as needed, though it will not last as long as metal drip edge.
Sealant only works for water going behind the gutter. If water is getting behind the drip edge and into the soffit, the gutter needs to be repositioned. Our gutter repair cost guide shows what resealing and resetting typically cost.
Related Gutter Problems
Loose or failing hangers can also let a gutter drop away from the roof edge, which Jimmy covers in his guide to gutter hanger types. If the gutters themselves are plastic or vinyl, his plastic vs. vinyl gutters breakdown explains why those systems leak more often.
Final Thoughts
Most leaks behind gutters come down to the roof edge: a missing drip edge, one that does not project over the gutter, or a gutter set too high. Diagnose which leak you have before paying for a fix. Our complete guide to gutters covers the rest of the system.
Homeowners in the West Grove, Pennsylvania area can reach Jimmy DeHart Sr. and Everything Gutter at everythinggutter.com. Everywhere else, Home Upgrade Pros connects homeowners with licensed gutter contractors for a free, no-obligation inspection, or call (725) 278-6174.
Frequently Asked Questions
Why is water leaking between my gutter and fascia board?
It is almost always a drip edge issue: no drip edge, one installed incorrectly, or one that does not extend far enough over the gutter’s back lip. Surface tension carries water around the shingle edge and behind the gutter.
What does it mean if water is dripping from my soffit?
The gutter is likely installed too high on the fascia, lifting the shingle so water works under it and behind the drip edge. Gutter guards that lift the shingle edge can cause the same problem. The fix is lowering the gutter so the shingle keeps its downward slope.
Can I fix a gutter leak without installing drip edge?
Yes, for fascia leaks. A bead of gutter sealant along the back edge of the gutter where it meets the fascia stops water from curling behind it. It does not fix soffit leaks, where water is getting under the shingles.
How far should a drip edge extend over the gutter?
Far enough that water dropping from it clears the gutter’s back lip. In Jimmy’s example, bending the drip edge out a quarter to half an inch over the back lip fixed the leak.
