Overflowing gutters during heavy rain may indicate an inadequate or poorly installed guttering system. Insufficient downpipes can cause rainwater to overflow, while more downpipes improve drainage. Larger gutter profiles, like Ogee or deep flow, hold more water and help prevent overflow, which is increasingly important given modern heavy rainfall patterns.

The most common problems with gutters are:

• Blocked gutters, outlets and downpipes
• Leaking gutter joints
• Perished joint seals
• Insufficient gutter capacity
• Poor drainage due to gutter alignment
• Not enough downpipes installed
• Gutter cut too short
• Lack of gutter supports installed
• Gutter joints not secured to the fascia board
• Old narrow gutter joints not allowing sufficient expansion

Leaking gutters can often be repaired successfully. The most common gutter problem is a leaking gutter joint. Gutter joints can usually be repaired by either replacing the joint, replacing the seals, or by completing a expert repair using a low-modulus, waterproof sealant that remains flexible when fully cured.