Gutter Not Draining

Common Symptoms

• Water overflowing the sides of gutters during rain
• Standing water visible in the gutter channel after rain stops
• Sagging gutter sections pulling away from the fascia
• Water pooling at the foundation or eroding soil near the house

Most Likely Causes

1. 1

   Clogged Downspout (Most Common)

   Downspout blockages are the primary cause of gutter overflow. Debris (leaves, seed pods, shingle granules) washes into the downspout and compacts into a plug, usually at the first elbow or at the bottom outlet. Even a partially clear downspout can be overwhelmed in a heavy rain if the flow capacity is reduced.

2. 2

   Clogged Gutter Channel

   Leaves and debris collect in the gutter trough, especially in corners and near downspout openings. A thick layer of compacted debris holds moisture and can fill the gutter to the point where it can't carry runoff during moderate rain — even if the downspout is clear.

3. 3

   Incorrect Gutter Slope

   Gutters must pitch toward the downspout at a rate of about 1/4 inch of drop per 10 feet of run. A gutter that has settled level or pitched away from the downspout will drain slowly, hold standing water, and develop sag points that worsen over time. Standing water after rain has stopped (when the downspout is clear) is the diagnostic sign.

4. 4

   Sagging Gutter from Failed Hangers

   Gutter hangers hold the gutter to the fascia and maintain slope. Hangers can corrode, pull loose from rotted wood, or space out over time. When a section sags, it creates a low spot that holds water and eventually overflows even during light rain.

Quick DIY Checks

1. 1Check the downspout first — go to the bottom of each downspout and look for debris blocking the outlet. Then look up into the downspout from the bottom with a flashlight. Most blockages occur at the first elbow after the gutter, or at the outlet.
2. 2Remove visible debris from the gutter by hand or with a gutter scoop, working from a secure ladder. Start at the far end (away from the downspout) and scoop toward it. Wear gloves — debris can contain sharp metal scraps, bird droppings, and mold.
3. 3Flush the gutter with a garden hose from the far end toward the downspout. Watch the downspout outlet for water flow. If water doesn't flow freely out the bottom, the downspout is clogged.

1. 4Snake the downspout if hose flushing doesn't clear it — insert a plumber's snake or a pressure-nozzle hose attachment into the downspout from the top to break up and push out the blockage.
2. 5Check gutter slope after cleaning — the gutter should slope toward the downspout at about 1/4 inch per 10 feet. Use a level or a bucket of water to verify. If you see a reverse slope or flat section, the hanger positions need adjustment.
3. 6Realign sagging sections by adding or repositioning gutter hangers. Hangers should be spaced no more than 24–36 inches apart. In regions with heavy snow or ice, space them 18 inches apart.
4. 7Check the downspout extension — water discharged from the downspout must travel at least 4 feet away from the foundation. Add a flexible downspout extension if the discharge point is too close to the house.
5. 8Consider gutter guards if this is a recurring problem — micro-mesh guards are the most effective at blocking debris while allowing water through. Clean gutters once a year even with guards installed.

Repair vs Replace

Recommended Tools & Parts

• Gutter Cleaning Kit

  Flexible rod-based gutter cleaning attachment for a standard garden hose — lets you blast debris from the gutter while standing on the ground in many cases. Avoids ladder use for single-story homes.

  $20–$40

  Buy on Amazon →

• Gutter Scoop

  Plastic gutter scoop shaped to fit standard K-style gutters — scoops compacted wet debris cleanly without scratching the gutter surface.

  $5–$12

  Buy on Amazon →

• Gutter Hangers (Hidden Hanger Style)

  Hidden spike-style aluminum gutter hangers for re-securing sagging gutter sections. Screw directly into the fascia board — more secure than the original spike-and-ferrule systems on older homes.

  $15–$30 for a pack

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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