How to Fix Sagging Gutters

Gutters that sag in the middle are telling you something is wrong—usually before water damage happens. The problem starts small: a fastener works loose, debris piles up and adds weight, or the gutter was never pitched correctly in the first place. Left alone, sagging gutters collect standing water that rots the fascia board underneath, invites mosquitoes, and eventually pulls away from the roofline entirely. This is a project you catch early and fix yourself in a Saturday morning. The fix depends on what caused the sag. Most of the time it's one of three things: hangers that have pulled away from the fascia, gutters clogged with leaves and sediment that weigh them down, or a gutter that lost its pitch and trapped water. We'll walk through diagnosing which one you have and fixing it so water runs straight to the downspout and your gutters stay tight to the roofline for years.

1. Clear the Gutter Completely. Use a gutter scoop or your hands to remove all leaves, dirt, and sediment from the sagging section and 3 feet on either side. Flush the entire run with a garden hose to confirm water flows freely. A clogged gutter can sag under 50 pounds of wet debris—clearing it alone may eliminate the problem.
2. Tighten Every Hanger. Walk along the gutter with a cordless drill or screwdriver and check every hanger bolt or screw within 6 feet of the sag. Tighten each one by hand first to feel resistance, then give it another quarter turn with a tool. If a screw spins freely and won't tighten, the hole in the fascia has enlarged and the fastener is no longer gripping.
3. Replace Broken Hangers. For fasteners that spin without tightening, remove the screw or bolt completely. Inspect the hanger bracket itself—if it's cracked or severely bent, replace the entire hanger. If the fascia hole is enlarged, move the hanger 2 inches to the side and drill a fresh hole. Reinstall with a new stainless steel hanger screw rated for exterior use, and tighten firmly but not so hard you strip the hole.
4. Restore Proper Pitch. Place a 2-foot level in the bottom of the gutter, running parallel to the roofline. The bubble should show a slight downslope toward the downspout—roughly one-quarter inch drop per 10 feet of run. If the gutter is level or slopes the wrong way, you need to loosen hangers on the upslope side and lift the gutter back to the correct angle. Loosen one hanger at a time, lift gently, and retighten while a helper confirms the pitch with the level.
5. Check Fascia for Rot. While the gutter is accessible, press your thumb or a small screwdriver against the fascia board behind the hangers. If the wood is soft, spongy, or your tool sinks in, the fascia is rotting and won't hold new fasteners. You'll need to replace that section of fascia before reinstalling the gutter—this is when you call a contractor to assess whether the rot extends deeper.
6. Verify Water Flows. Run the garden hose into the cleared gutter from the high end and watch it flow. Water should move smoothly toward the downspout with no pooling or backing up. Run the hose for at least 30 seconds to simulate heavy rain. Check underneath the gutter and along the fascia for any new drips or leaks that weren't there before.
7. Add Guards Against Future Clogs. If the gutter filled up with leaves within a year or two, install a gutter guard or screen to prevent future clogs. Snap-on plastic guards fit most gutter profiles and can be added without removing the gutter. Measure the gutter profile first—these aren't one-size-fits-all—and order guards for the full run, not just the sagging section.