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GUTTERS & EXTERIOR FABRIC

Downpipe Leaking

A downpipe leak usually comes from a loose joint, split pipe, blocked offset or damaged shoe connection.

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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

Loose push-fit joint Pipe sections have moved apart.
Cracked pipe or fitting Impact or age has damaged the material.
Blocked bend or outlet Backed-up water escapes through joints.
Loose clips Movement stresses the connections.
◫ Symptom variations Match the leak, crack or damp pattern. ⌄
  • Water runs down outside of pipe
  • Leak appears at bend
  • Pipe moves in wind
  • Staining on wall
  • Leak worsens when gutter is full
✓ Quick checks Safe checks before opening joints or removing finishes. ⌄
  1. Check the gutter outlet and top connection.
  2. Inspect every joint and clip.
  3. Look for cracks on bends and offsets.
  4. Check the shoe or gully below.
  5. Confirm the pipe is not blocked.
Important: Fix the source of water or movement before sealing over visible damage.
1 Step 1 — Clear any restriction Make the smallest safe correction and retest. ⌄

A blocked pipe must be cleared before sealing joints.

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

Refit loose sections and secure clips.

3 Step 3 — Replace cracked components Make the smallest safe correction and retest. ⌄

Use matching fittings rather than wrapping damaged pipe.

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

Downpipes carry concentrated roof water. Small cracks or loose joints quickly produce visible leaks.

⌘ Advanced checks Further diagnosis for persistent exterior faults. ⌄
  1. Check pipe alignment.
  2. Inspect underground connection.
  3. Assess thermal movement.
  4. Check clip spacing.
  5. Review whether the pipe is undersized.
◇ Tools and information needed Useful items for accurate checks. ⌄
  • Gloves
  • Bucket
  • Screwdriver
  • Hose
  • Flexible drain tool
▣ Parts or materials that may help Common exterior repair materials linked to this fault. ⌄
  • Downpipe section
  • Bends or offsets
  • Pipe clips
  • Shoe
  • Joint fittings
! When to call a professional Conditions that should end basic DIY diagnosis. ⌄
  • The leak is above safe access.
  • The pipe is cast iron.
  • Water is penetrating the wall.
  • The blockage is underground.
  • Repeated failure suggests poor installation.
? Frequently asked questions Common gutter and exterior-fabric questions. ⌄

Can I tape a cracked downpipe?

Only as a very short-term measure.

Why does it leak at a joint only during heavy rain?

The pipe may be partly blocked or overloaded.

Should joints be glued?

Most plastic systems are designed as push-fit and need movement allowance.