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GUTTERS & EXTERIOR FABRIC

Gutter Leaking at Joint

A gutter joint usually leaks because the rubber seal is dirty, twisted, worn or the gutter sections are misaligned.

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Use safe access and stop water entry early

Do not work from unsafe ladders or beneath unstable masonry. Isolate water supplies where needed and stop if structural movement or major wall saturation is suspected.

MOST LIKELY CAUSES

Start with joints, fixings and the water path

Dirty or displaced seal Debris prevents the joint from closing properly.
Worn rubber gasket The seal has hardened or shrunk.
Poor alignment The gutter sections are pulling apart.
Cracked connector The joint fitting itself has split.
◫ Symptom variations Match the leak, crack or damp pattern. ⌄
  • Drip appears directly below connector
  • Leak worsens in heavy rain
  • Joint separates slightly
  • Water tracks along underside
  • Leak returns after temporary sealant
✓ Quick checks Safe checks before opening joints or removing finishes. ⌄
  1. Inspect the joint from a safe position.
  2. Check whether sections are fully clipped in.
  3. Look for debris or moss around the seal.
  4. Check bracket spacing either side.
  5. Inspect the connector for cracks.
Important: Fix the source of water or movement before sealing over visible damage.
1 Step 1 — Clean and reseat the joint Make the smallest safe correction and retest. ⌄

Remove debris and make sure the seal sits correctly.

2 Step 2 — Restore alignment and support Make the smallest safe correction and retest. ⌄

Refix nearby brackets so the joint is not under tension.

3 Step 3 — Replace damaged parts Make the smallest safe correction and retest. ⌄

Fit a matching connector or gasket rather than relying on surface sealant.

⌁ Why the problem happens How weather, movement and failed materials affect the exterior. ⌄

Gutter joints move with temperature. The rubber seal must stay clean, supported and correctly compressed.

⌘ Advanced checks Further diagnosis for persistent exterior faults. ⌄
  1. Check thermal expansion allowance.
  2. Inspect fascia condition.
  3. Assess gutter fall.
  4. Check whether different gutter profiles have been mixed.
  5. Look for bracket movement.
◇ Tools and information needed Useful items for accurate checks. ⌄
  • Stable ladder or access tower
  • Gloves
  • Screwdriver
  • Cleaning cloth
  • Hose
▣ Parts or materials that may help Common exterior repair materials linked to this fault. ⌄
  • Joint connector
  • Rubber gasket
  • Gutter brackets
  • Matching gutter section
  • Exterior screws
! When to call a professional Conditions that should end basic DIY diagnosis. ⌄
  • Safe access is not possible.
  • The fascia is rotten.
  • Several joints are failing.
  • The gutter is very high.
  • Water is entering the building fabric.
? Frequently asked questions Common gutter and exterior-fabric questions. ⌄

Can I just apply silicone around the joint?

That is usually temporary and can stop the fitting moving correctly.

Why does it leak only in cold weather?

Temperature movement can open a weak joint.

Should I replace the seal or the whole connector?

Replace whichever part is worn or damaged.