Is Your Chimney Flashing Still Doing Its Job?
Chimney flashing may not be the most noticeable feature of your roof, but it plays a crucial role in preventing water ingress and long-term structural damage. When flashing fails, leaks and costly repairs often follow. At KAM Roofing Askern in Askern, South Yorkshire, we regularly inspect and repair chimney flashing to ensure homes stay dry, safe, and weatherproof all year round.
If you’re unsure whether your chimney flashing is still functioning as it should, here’s what you need to know.
What Is Chimney Flashing?
Chimney flashing is the protective barrier that seals the junction between your chimney stack and the roof surface. It’s typically made from lead, aluminium, or galvanised steel and is installed in layers to direct water away from this vulnerable intersection.
There are usually three components:
- Step flashing – Tucked under each tile or slate along the chimney sides
- Counter flashing – Overlaps step flashing and is embedded into the brickwork
- Back and front flashing – Protects the top and bottom of the stack where water is likely to collect or flow
When installed correctly, these components work together to create a watertight seal.
Signs That Your Flashing May Be Failing
Like any part of your roof, chimney flashing deteriorates over time due to weather exposure, movement, or poor workmanship. Common signs of failure include:
- Stains or damp patches on internal ceilings or walls near the chimney
- Loose or missing lead flashing visible from ground level
- Cracked mortar joints or separation between flashing and brickwork
- Rusted or corroded metal flashing
- Water dripping into the fireplace or loft after heavy rain
If you spot any of these issues, it’s important to act quickly. A small leak can escalate into widespread damage if left unresolved.
Why Flashing Fails
Flashing can stop working properly for several reasons:
- Age – Lead or metal flashing can degrade after decades of exposure
- Movement – Expansion and contraction from temperature changes can loosen joints
- Poor installation – Incorrectly fitted flashing won’t provide a proper seal
- Mortar failure – If the mortar securing counter flashing crumbles, water can seep behind
- Storm damage – High winds can dislodge or warp flashing sections
At KAM Roofing Askern, we always ensure flashing is installed using the correct methods and materials suitable for the South Yorkshire climate.
Importance of Timely Repairs or Replacement
Neglected flashing issues can result in:
- Rotting roof timbers and internal plaster
- Mould and mildew growth
- Structural damage to walls and ceilings
- Increased heating bills due to moisture-related insulation problems
Replacing or repairing chimney flashing is a relatively simple job when caught early. It can save you from far more expensive repair work later on.
What We Recommend
To keep your roof and chimney in top condition, we advise:
- Annual roof inspections – Especially before winter or after major storms
- Checking your loft – Look for water stains, mould, or daylight around the chimney
- Calling a professional – If in doubt, have your flashing checked by a qualified roofer
We offer thorough chimney and roof inspections across Askern, giving homeowners peace of mind and practical solutions for any issues found.
Conclusion
Chimney flashing may be small, but its job is vital. A well-maintained flashing system keeps water out, protects your home’s structure, and prevents costly internal damage. At KAM Roofing Askern in Askern, South Yorkshire, we offer expert inspections, repairs, and replacements for chimney flashing, ensuring your home stays protected in all weather.
If you’re concerned about the condition of your chimney flashing or have spotted signs of water ingress, contact KAM Roofing Askern today to book a professional inspection and advice tailored to your roof.
Call us on: 01302 496 292
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