Roofing & Exterior
Overflowing Gutters Have a Reason. We Find It First.
Water pouring over the edge isn't always a clog. We diagnose the actual cause — undersizing, poor pitch, too few outlets, restricted downspouts, or sheer volume at a valley — so the fix solves the problem instead of guessing at it.
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Signs to watch
Is this you?
It overflows even right after it's been cleaned
If a clean gutter still pours over the edge, the problem isn't debris — it's usually undersizing, too few outlets, or bad pitch. Cleaning it again won't fix a system that's simply too small for the water.
It only overflows at one spot
Overflow at a single point almost always means a valley or roof plane is dumping high volume there faster than one outlet can take it. That's a capacity and outlet-placement problem, not a whole-gutter problem.
Water backs up and stands in the run
Standing water points to pitch that's too flat or pitched away from the outlet, or a downspout that's restricted. The gutter fills because the water can't get out fast enough, then spills.
Overflow is streaking siding or soaking the foundation
Water going over the edge lands right at the wall and footing — exactly where you don't want it. The overflow you see at the roofline is the start of the fascia and foundation problems you'll see later.
Your options
Diagnose the cause, then fix that
We work through the real reasons gutters overflow — undersized troughs for the roof area, clogs and matted evergreen debris, pitch that's too flat or backward, too few outlets for the volume, downspouts restricted or crushed downstream, and valleys or large planes concentrating more water than one drop point can handle. We identify which of those is actually happening on your house, because the fix for undersizing is different from the fix for a clog, and re-cleaning a gutter that's simply too small just wastes your money. Then we lay out the honest repair — more outlets, larger downspouts, a re-pitch, upsizing a run, or clearing a restriction — matched to the cause we found.
The method
How we do it
- 01
See where it actually spills
We look at the roof geometry, the valleys and concentration points, and where the overflow happens — the location of the spill tells us most of the story.
- 02
Test the system under water
We run water through the runs and downspouts to reproduce the overflow and confirm whether it's capacity, pitch, an outlet count, or a downstream restriction.
- 03
Match the fix to the cause
You get a clear read on why it overflows and the specific fix for that cause — not a default recommendation to replace everything.
Straight numbers
What the diagnosis and fix run
The diagnosis is straightforward; the cost is in the fix, and that depends entirely on the cause. Adding an outlet or clearing a downspout restriction is a small job; re-pitching a run or upsizing undersized gutters and downspouts is a larger one. We price the actual fix for the actual cause after we've confirmed it — you won't pay for a gutter replacement when the real problem was two missing outlets, and you won't get a re-clean sold to you when the run is simply undersized.
Where we do this work
Gutter Overflow & Drainage Diagnosis: straight answers
My gutters are clean but still overflow — why?
Because overflow isn't only about debris. A clean gutter still pours over if it's undersized for the roof area, has too few outlets, is pitched wrong, or has a restricted downspout downstream. When cleaning doesn't fix it, the cause is the system's capacity or slope — and that's exactly what the diagnosis is for.
It only overflows in one spot. Is that the whole gutter's fault?
Usually not. Overflow at a single point almost always means a valley or large roof plane concentrates high volume right there, faster than one outlet can drain it. The fix is often an added outlet or a larger downspout at that spot — not replacing runs that are working fine everywhere else.
Would bigger gutters solve it?
Sometimes — undersizing is a real and common cause in the PNW, where roof volume is high. But bigger gutters won't fix a pitch problem, too few outlets, or a crushed downspout, and upsizing when that isn't the cause is wasted money. That's why we diagnose first: so you spend on the fix that matches your actual problem.
Can overflow really hurt my house?
Yes. Water going over the edge lands right at the siding and the foundation — the exact places gutters exist to protect. Left alone, chronic overflow rots fascia, feeds moss, and pushes water into crawlspaces and against footings. Diagnosing and fixing the cause is a lot cheaper than the water damage it prevents.
Get the gutter overflow & drainage diagnosis conversation started.
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