Gutter leaking: find where the water escapes and what that means
Where the water drips from matters more than the fact that it drips.
A gutter that leaks is almost always failing at one of four places: a seam, a corner, a hole in the metal. Or the joint where it meets the fascia. You do not have to guess which. Stand on the ground during a steady rain and watch where the water leaves the gutter. That one observation sorts the problem before anyone touches a tool.
Seams and corners are the usual suspects
Sectional gutters are joined with a sealant that dries and cracks over the years. When a seam lets go, you see a steady drip or a dark streak down the face right under the joint. A corner does the same thing, only with more water, because two runs pour into it.
Seamless gutters have fewer joints, so leaks cluster at the corners, at the end caps and where the downspout outlet is cut in. If the drip is always at the same joint, that joint is your answer.
Drips along the length point to the metal
Small holes show up as thin streams or a spray from the bottom of the trough. Rust is the usual cause on steel, and pitting on aluminum comes from standing water and debris that stay wet for weeks. A few pinholes can be sealed. A trough that is rusting through in several places is at the end of its life.
Look for a second clue before you decide. If the leaks sit in the lowest spot of a sagging run, the gutter is holding water that should have drained, and the metal is only the victim. Our page on overflowing gutters explains how to read that pattern.
Water behind the gutter is a different problem
Sometimes the gutter looks fine from the front, yet water runs down the fascia board or the siding behind it. Here the water is slipping over the back edge, or it is missing the trough entirely because the shingles end too short of it. That is not a leak in the gutter. It is a gap in how the roof edge and the gutter work together.
Left alone, that water soaks the fascia and the soffit behind it. Peeling paint, a soft board, or a stain on the underside of the eave are the early signs. Treat those as roof edge damage, not as a gutter chore.
What you can safely check yourself
Everything useful here happens from the ground. Watch in the rain, take photos of each drip point and note which side of the house it is on. After the rain stops, look at the fascia and the siding below for dark lines or staining, using binoculars if the gutter is high.
We do not write instructions for reaching over the edge and resealing joints from a ladder top or the roof. Working at the eave on a wet, slick surface is where people fall, and a sealant job done in a hurry fails again next season. A photo log gives a gutter contractor everything needed to quote the right fix.
Repair or replace the run
One bad seam or corner is a small repair. Several leaks along an old, sagging, rusting run usually mean the whole run has done its job. Patching a worn gutter section by section is a cycle that rarely ends. If the leaks are spread out, plan for new gutters and ask the contractor to look at the fascia while they are there.
Whichever route you take, ask for the slope toward the downspout to be set correctly. A gutter that does not drain fully will leak again at the same joints, whatever sealant is used.
Frequently asked questions
Why is my gutter leaking in the middle and not at a joint?
A drip from the middle of a run usually means a pinhole, rust through the bottom of the trough, or a low spot where water stands. Watch during rain to see whether the leak follows the sag.
Can a leaking gutter damage the house?
Yes, over time. Water that misses the trough soaks the fascia, soffit and siding behind it, which can lead to rot and paint failure on the roof edge.
Is a leak at a corner normal?
It is common. Two runs meet there and the sealant ages first at that joint. A leak that returns every year suggests the corner or the slope needs proper attention.
Should I climb up to reseal the gutter myself?
We do not recommend it. The work means leaning over the roof edge, often on a wet surface, and a rushed seal fails again. Document the drip points from the ground and let a contractor handle the fix.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- US EPA. Soak Up the Rain — managing stormwater around a property
- NRCA. National Roofing Contractors Association