Why Cracks in Render Are a Problem for Tamworth Homes
Render is designed to protect the underlying brickwork or blockwork from the elements. When it’s in good condition, it forms a weather-resistant barrier that keeps rainwater out. However, cracks in render — even small hairline ones — can compromise this barrier and allow moisture to enter the wall.
For homes in Tamworth, where heavy rain and strong winds are common, cracked render can quickly lead to penetrating damp, discolouration, and in severe cases, damage to the building’s structure.
What Causes Cracking in Render?
Render can develop cracks for several reasons:
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Natural movement of the building over time
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Thermal expansion and contraction caused by temperature changes
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Poor application during installation
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Water damage behind the render from failed gutters or downpipes
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Impact damage from knocks or weather events
These cracks can range from thin surface hairlines to deeper, more serious fractures.
The Risks of Leaving Cracks Untreated
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Lateral moisture ingress – water soaks through the crack and into the wall structure
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Freeze–thaw damage – moisture trapped in the crack can freeze and expand in winter, making the damage worse
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Internal damp patches – leading to peeling paint, mould growth, and salt deposits
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Reduced energy efficiency – damp walls lose heat faster, increasing heating bills
How Cracked Render Should Be Repaired
Repairing cracked render is about more than just filling the gap. The process should include:
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Identifying the cause of the cracking to prevent recurrence
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Removing any loose or damaged render to expose a stable surface
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Using breathable repair mortars to fill and seal the crack
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Applying a protective, breathable finish to stop water ingress while allowing trapped moisture to escape
At Weather Wise, we recommend breathable, weather-resistant coatings available from trusted suppliers like Builders Super Store to ensure repairs last.
Protecting Your Home from Lateral Damp
Cracks in render can lead to damp problems if ignored, but with timely repairs, your home can remain both protected and attractive. A regular inspection of external walls — especially after severe weather — can catch problems early before they become costly.
Book a Free Survey for your Home here:
👉 https://weatherwiseuk.co.uk/pages/contact