Damp Coming Through Render
Damp patches visible on internal walls that correspond to areas of external render, especially after rain.
What Is Causing This?
- 1Cracked render allowing rain to penetrate
- 2Render trapping moisture rather than allowing the wall to breathe
- 3Render applied over a wall with no cavity, bridging damp to inside
How Urgent Is This?
This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.
What Needs to Be Done
A rendering specialist will remove the failed render, allow the wall to dry, and re-render with a breathable lime or silicone-based system that allows moisture to escape.
How Much Will It Cost?
National average estimate
Labour: £850 – £2,233 | Materials: £417 – £1,267
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Prices are estimates based on typical UK rates. Actual costs depend on the specific issue, accessibility, and your location. All quotes from tradespeople on Tradesfolk are completely free.
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Ask a QuestionPlanning Permission Guidance
Some fixes for this problem may require planning permission or building regulations approval. Check if your project needs permission:
How to Prevent This
Use breathable render on solid-walled properties. Maintain the render surface to prevent cracks. Ensure the base of the render does not sit below the DPC.
Related Problems
Cracks appearing in the external render, ranging from hairline to wide splits that expose the masonry beneath.
Damp patches appearing on inside walls, particularly after rain, often with a musty smell.
Damp, dark, or stained areas appearing on an exterior brick wall, especially after rain.
Other Rendering Specialist Problems
Cracks appearing in the external render, ranging from hairline to wide splits that expose the masonry beneath.
Sections of external render detaching and falling from the wall, exposing bare brickwork or blockwork.
External render developing green algae or moss growth, making the walls look dirty and neglected.
Pebbledash coating losing stones or whole sections detaching from the wall.