Can Blocked Gutters Cause Damp?

How overflowing gutters contribute to damp walls, staining and damaged fascia boards — and what to check first.

Yes — and it is a common cause

When a gutter overflows, water runs straight down the wall instead of away through the downpipe. Brickwork that is repeatedly saturated stays wet, and that moisture can work its way inward.

What it looks like

Externally you may see staining, moss on the wall, or spalling brick. Internally, damp from a gutter problem often shows as a patch high on a wall or across a ceiling corner, worse after prolonged rain.

Check the outside first

Before treating damp internally, it is worth confirming that rainwater is being carried away as it should be. An inspection of the guttering and downpipes will show whether the source is outside.

Related service

Read more about how this is handled in practice.

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