Why is my gutter sagging?

Almost always one of three things. The original spikes and ferrules have worked loose — aluminum expands and contracts through every temperature cycle and a smooth spike slowly walks out of the fascia. The hangers are spaced too far apart, so a gutter full of water and debris deflects between them; 24 to 32 inches is the standard spacing, and 36 inches or more is asking for sag. Or the fascia board behind the gutter has rotted, in which case nothing you screw into it will hold and the board must be replaced first. Check that third possibility before buying anything.

Can you fix a sagging gutter yourself?

Yes, if the fascia is sound. Replacing failed spikes with hidden hangers is a straightforward repair with a cordless drill and a nut driver, costs $20 to $50 in hardware for a typical run, and takes an afternoon. What makes it a job to take seriously is that all of it happens on a ladder, leaning along the gutter line with both hands occupied. If the fascia is rotted, or the gutter is on a second story, or the ground below is soft or sloped, this is a reasonable job to hire out.

How much pitch should a gutter have?

About 1/4 inch of fall for every 10 feet of run toward the downspout — roughly a 1/2 inch drop over a 20-foot gutter. That is deliberately subtle: too little and water stands and breeds mosquitoes, too much and the gutter visibly slopes against the roof line and looks wrong. On very long runs it is common to pitch from a high point in the middle toward downspouts at both ends rather than running the full length one way. Snap a chalk line before you refasten anything rather than trying to judge it by eye from a ladder.

Should I use gutter spikes or hidden hangers?

Hidden hangers, without hesitation. Spikes and ferrules were the standard for decades and their failure mode is built in: a smooth shank in a wood fascia has nothing to resist the thermal cycling of an aluminum gutter, so it walks out over years. Hidden hangers clip over the gutter lip and fasten with a threaded screw into the fascia, which resists withdrawal. They are also invisible from the ground, where a row of spike heads is not. Hangers cost roughly $1 to $2 each and one repair generally outlasts the gutter.

How much does it cost to fix a sagging gutter?

DIY hardware for a typical run is $20 to $50 — hangers are about $1 to $2 each and you want one every 24 to 32 inches. Professional gutter repair commonly runs $150 to $350 for a section, often quoted alongside a cleaning visit. Replacing a rotted fascia board is a different and larger job, usually $10 to $20 per linear foot including paint, because the gutter must come down and go back up. If a whole side is failing and the gutter is 20-plus years old, replacement rather than repair often makes better sense.

How to Fix a Sagging Gutter: Hangers, Pitch and Rot

Written & researched by Elena Marsh Gardening & Landscaping Editor

Updated October 2026

Three-quarter view of a person laying a stone paver into a sand base while building a garden path, in soft overcast light

Affiliate Disclosure

Some links on this page are affiliate links. As an Amazon Associate, we earn from qualifying purchases — at no extra cost to you. We do not buy, test, or physically handle the products we cover; our rankings come from aggregated owner reviews, ratings and expert consensus. Commissions never change our verdicts. How we rank · full disclosure.

A sagging gutter is nearly always a fastener problem, and the fix is replacing spikes with hidden hangers. It is an afternoon, $20 to $50 in hardware, and a cordless drill — provided the fascia board behind the gutter is sound. Check that first by pushing a screwdriver into the wood; if it goes in easily, the board is rotted and no fastener will hold. Reset the run to about 1/4 inch of fall per 10 feet toward the downspout, and space hangers every 24 to 32 inches. All of this happens on a ladder, which is the part that deserves your caution.

Replacing failed gutter spikes with hidden hangers and screws — full repair

Diagnose Before You Buy Anything

Three causes, and only two of them are fixed with hardware.

Symptom	Likely cause	Fix
Spike heads standing proud of the gutter face	Spikes walking out of the fascia	Replace with hidden hangers
Gutter dips between fasteners, fasteners tight	Hangers spaced too far apart	Add hangers to 24–32 in spacing
Screws spin without biting; wood is soft	Rotted fascia	Replace the fascia board first
Water stands in the trough after rain	Lost pitch, or a low point	Re-hang to 1/4 in per 10 ft
Whole run pulled away at one end	Ice, snow load or ladder damage	Re-hang; check for a deformed lip
Gutter separated at a seam	Failed sealant at a joint	Clean, dry and reseal with gutter sealant

The fascia check is the one people skip and the one that decides the job. Push the tip of a screwdriver into the fascia at several points behind the gutter, particularly directly behind any spike that has pulled. Sound wood resists. If it sinks in, or the wood is dark and spongy, you have a rot problem that a longer screw will not solve — and a sagging gutter that has been overflowing for years is a very common cause of exactly that rot.

Over-the-shoulder view of a person laying a stone paver into a sand base while building a garden path, in soft overcast light

Tools and Materials

Hidden gutter hangers with pre-inserted screws, sized to your gutter — 5 inch for most homes, 6 inch for larger roofs. Count one every 24 to 32 inches, plus a few spares. A 50-pack such as these 5-inch quick-screw hidden hangers (paid link) covers a typical house; a 25-pack with the matching drill bit (paid link) suits a single run.
Cordless drill with a 1/4 inch hex driver, and a spare battery.
Gutter sealant rated for aluminum, for any seams you open.
Chalk line and a level for resetting pitch.
Extension ladder with a stabilizer bar. The stabilizer is not optional on this job — see the safety section.
Gloves and eye protection. Cut aluminum edges are genuinely sharp and old gutters hold grit.

Golden-hour view of a person laying a stone paver into a sand base while building a garden path

The Repair, Step by Step

Clean the gutter first. You cannot judge pitch or find a low point in a trough full of leaf sludge, and a full gutter is heavy to lift. Clear it and flush the downspout.
Check the fascia at every fastener location, as above. Stop here if it is soft.
Mark the correct line. At the high end of the run, mark the gutter's finished top edge on the fascia. Measure the run, calculate the drop at 1/4 inch per 10 feet, mark the low end at the downspout, and snap a chalk line between them. This line is the target, not the current position.
Support the gutter before removing fasteners. Two hands or a helper. A 20-foot aluminum run that drops on one end kinks permanently.
Pull the old spikes. A pry bar with a rag under it to protect the gutter face. Keep them for reference on hole positions — do not reuse them.
Lift the gutter to the chalk line and hold it there.
Fit hidden hangers every 24 to 32 inches. Clip the hanger over the back and front lips of the gutter, then drive the screw through the fascia into the rafter tail wherever one lines up. Rafter tails are typically at 16 or 24 inch centers; catching one is much stronger than fascia alone, though a good hanger in sound fascia is adequate.
Reduce spacing on problem sections. Under a valley, where a large area of roof drains onto a short length of gutter, go to 18 to 24 inch spacing. That is where the water and the ice load concentrate.
Plug the old spike holes. Gutter sealant on the inside and a dab of exterior caulk on the fascia outside. Left open, they drip down the fascia and start the next rot.
Test with water. Run a hose into the high end. Water should travel the full run and discharge without pausing. Any spot where it stands is a low point — add or adjust a hanger there.
Reseal any seams you disturbed. Clean, dry, and use a sealant rated for aluminum, applied inside the gutter rather than outside.

Ladder Safety — the Real Risk in This Job

This repair puts you high on a ladder, leaning sideways along a gutter line, holding a heavy aluminum run with one hand and a drill with the other. That is the precise combination that causes falls. The CDC's analysis of occupational ladder fall injuries in the United States recorded 113 deaths and about 34,000 emergency-department visits from work-related ladder falls in one year, with 43 percent of fatal falls in the preceding decade involving a ladder — among people who climb for a living.

The safer routes are real: gutter repair is one of the cheaper things a contractor does, commonly $150 to $350 for a section, and unlike cleaning there is no ground-based version of this task. If your gutter is on a second story, or the ground below is soft or sloped, hiring it out is the sensible call rather than the cautious one.

If you are going up, follow these exactly. OSHA's ladder standard, 29 CFR 1926.1053, requires a non-self-supporting ladder to be set so the horizontal distance from the foot to the top support is about one-quarter of the working length — the 4-to-1 rule, one foot out per four feet up. Keep three points of contact; hoist hangers and the drill in a bucket rather than climbing with them. Never let your belt buckle pass outside the rails — move the ladder instead, however many times that takes. Never stand on the top two rungs. Set the feet on firm level ground. And never lean the ladder against the gutter, which on this job is a particular temptation because the gutter is what you are working on: an aluminum K-style gutter deforms under a ladder's point load, and once dented the ladder slides sideways along it. Use a stabilizer that bears on the fascia or the roof edge. Work with a helper if at all possible.

Close-up detail of the material being worked in a landscaping & hardscaping project, in soft overcast light

Preventing the Next Sag

Keep the gutter clear. A gutter full of wet debris can weigh several times what the same gutter full of water does, and the load never comes off. Twice-yearly cleaning is the whole prevention strategy — see how often to clean gutters.
Fix overflow at the source. Chronic overflow soaks the fascia and starts the rot that ends the gutter. Overflow usually means a blockage, not an undersized gutter.
Reduce hanger spacing in snow country. Sliding snow and ice apply loads no gutter is rated for. 18 to 24 inches, and consider snow guards on a metal roof.
Extend the downspouts. Not related to sag, but the same weekend and the bigger win — see downspout extensions.
Consider guards on the runs that clog. Not maintenance-free, but half the visits — our gutter guard picks covers what each type actually stops.

The Bottom Line

Check the fascia, snap a chalk line at 1/4 inch of fall per 10 feet, and replace every spike with a hidden hanger at 24 to 32 inch spacing. That repair generally outlives the gutter it fixes. What it will not do is survive a rotted board, so be honest about the wood before you spend the afternoon — and be equally honest about the ladder.

We never buy, test or physically handle the products we rank. Recommendations come from aggregated owner reviews, star ratings, review volume and expert consensus — see how we rank.

How to Fix a Sagging Gutter