Rainwater Downpipe Problems

Typical problems

• Leaves/debris blocking shoes or bends
• Leaks at joints or cracked sections
• Downpipes feeding into foul drains (non-compliant)
• Poorly sized gullies causing backup
• Missing or damaged shoe connections
• Frost damage to joints and clips

Why these matter

• Overflows: can damage walls, foundations, and cause damp
• Wrong connections: surface water into foul drains can breach regulations and overload systems
• Leaks: staining, erosion, and structural problems over time

Quick checks & fixes

• Clear shoes and bends regularly (especially autumn)
• Check joints after frosts and storms for cracks
• Verify correct discharge to soakaway or surface water system
• Ensure gullies are clear and correctly sized
• Look for staining or moss growth indicating chronic leaks

When to investigate further

• Persistent overflow despite clearing blockages
• Multiple downpipes affected (suggests downstream issue)
• Suspected connection to foul system
• Property flooding or foundation concerns

For downstream problems, a CCTV survey can trace connections and identify blockages in underground surface water drains.

Compliance reminder

In many areas, surface water must discharge separately from foul drainage. Connecting downpipes to foul drains can breach Building Regulations and water authority rules. Check your system layout with drain mapping if unsure.