Damp, Condensation & Moisture Problems Properly Diagnosed
Don’t guess. Identify the cause before treating the symptoms.
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Why Is My Wall Wet After Rain London
If your wall becomes wet after rain, it is often a sign of water ingress. This is a common issue in London properties, particularly in older buildings where external walls may allow moisture to penetrate during heavy rainfall.
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What Causes Walls to Become Wet After Rain
Walls that become wet after rainfall are typically affected by water entering through external defects. Cracks in brickwork, damaged pointing, and porous masonry can all allow moisture to pass through the structure and appear internally.
Common Causes of Rain Related Damp
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Cracked or damaged external brickwork
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Worn or missing pointing
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Faulty guttering or downpipes
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Porous masonry absorbing rainwater
Is This Damp or Condensation
If the wall only becomes wet after rain, it is usually a sign of water ingress rather than condensation. Condensation tends to form from internal moisture, whereas rain related damp is directly linked to external weather conditions.
Rain related damp issues are often misdiagnosed, leading to ineffective treatments. Identifying the exact entry point of water is essential to prevent ongoing problems.
If you’re unsure whether damp proofing is required, you can read our guide on do I need damp proofing.
You can learn more about related issues:
Damp Inspections for Water Ingress London
A professional damp inspection can identify how and where water is entering the property, ensuring the correct repair method is used rather than temporary solutions.
For a full assessment, visit our damp inspection London page.