Cracks in walls are one of the most common concerns homeowners have. While some are completely harmless and part of the natural settling process, others can indicate a more serious issue that shouldn’t be ignored.
The key is knowing the difference.
In this week’s Property Hub, we explain why cracks appear, when they’re nothing to worry about, and when it’s time to call in the professionals.
Hairline Cracks – Usually Nothing to Worry About
Small, fine cracks in plaster are often caused by normal movement as a property settles or as building materials naturally expand and contract with changes in temperature and humidity.
These cracks are generally:
- Thin and shallow
- Found around doors and windows
- Limited to the plaster surface
- Easy to repair with filler and redecoration
Although they may not look great, they rarely indicate a structural problem.
When Cracks Could Be More Serious
Not every crack is cosmetic.
You should seek professional advice if you notice:
- Cracks wider than a few millimetres
- Cracks that continue to grow over time
- Diagonal cracks around doors or windows
- Large cracks in external walls or brickwork
- Doors or windows that suddenly become difficult to open or close
- Uneven floors appearing alongside the cracks
These signs may indicate movement within the property that needs further investigation.
Could Damp Be the Cause?
Cracking plaster isn’t always caused by movement.
Persistent damp can weaken plaster, causing it to crack, blister, or crumble.
Common sources include:
- Leaking gutters
- Penetrating damp
- Plumbing leaks
- Roof defects
- Condensation
If the underlying moisture problem isn’t fixed, repairing the plaster alone won’t solve the issue.
Don’t Just Fill the Crack
It’s tempting to fill a crack, paint over it, and hope for the best.
However, if the crack has been caused by movement or damp, it’s likely to return.
The first step should always be identifying why the crack has appeared.
Only once the cause has been resolved should permanent repairs be carried out.
How Cracks Are Repaired
The right repair depends on the cause.
Repairs may include:
- Filling and re-plastering cosmetic cracks
- Repairing damaged plaster
- Resolving damp problems
- Replacing damaged sections of wall
- Structural repairs where necessary
A professional assessment ensures the correct solution is applied rather than simply hiding the symptoms.
Preventing Future Cracks
While some movement is unavoidable, regular property maintenance can reduce the risk of more serious problems.
Simple steps include:
- Keeping gutters clear and in good repair
- Fixing roof leaks promptly
- Maintaining external pointing and render
- Addressing damp issues early
- Repairing minor defects before they worsen
Looking after your property today can help prevent more expensive repairs in the future.
Final Thoughts
Not every crack is a sign of serious structural damage—but neither should every crack be ignored.
Understanding what’s causing the problem is the most important step towards finding the right solution. Early intervention can prevent minor issues from developing into costly repairs.
If you’re unsure whether a crack is cosmetic or something more significant, it’s always worth having it professionally assessed.
Noticed cracks appearing in your walls or ceilings?
One Solution can identify the cause, carry out any necessary repairs, and restore your property to a safe, high-quality finish. Whether it’s plaster repairs, damp remediation, or general property maintenance, we’re here to help.
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