Lead flashing is a critical component in roofing that often goes unnoticed, yet it plays a vital role in keeping properties watertight. This is especially important around features like dormer windows and chimneys, where the junctions between different surfaces are most vulnerable to leaks.
At Gamston Roofing Repairs, we regularly carry out expert leadwork on homes across Gamston, Nottingham. This article will explain how lead flashing functions around dormers and chimneys, why it matters, and what property owners should look out for.
What Is Lead Flashing?
Lead flashing is a malleable yet durable material used to seal joints and prevent water from entering a structure. It is typically fitted where the roof meets vertical features such as chimneys, walls, and dormers. Thanks to its flexibility and resistance to weathering, lead is one of the most reliable flashing materials available.
Why Is Flashing Needed Around Dormers and Chimneys?
Dormers and chimneys interrupt the smooth flow of the roof surface, making them prime areas for water ingress if not properly sealed. Flashing provides a protective barrier that directs rainwater away from these vulnerable points and into the roof’s drainage system.
Without correctly installed lead flashing, even a newly tiled roof can suffer from leaks, rot, and internal damp patches.
How Lead Flashing Works Around Dormers
Dormer windows project vertically from the roof and require flashing at multiple junctions:
Key flashing areas on dormers:
- Side abutments: Flashing is fitted where the dormer cheeks meet the pitched roof to prevent lateral water entry.
- Head flashing: Installed along the top edge of the dormer to prevent water ingress from above.
- Sill or apron flashing: Positioned below the window to direct water away from the base of the dormer.
Proper detailing and lap joints are essential to ensure water cannot seep underneath. At Gamston Roofing Repairs, we ensure that each section is shaped and seated correctly, with fixings that allow for thermal movement.
How Lead Flashing Works Around Chimneys
Chimneys present four main areas that need protection with lead flashing. Each part plays a specific role in keeping the chimney area watertight:
Common chimney flashing types:
- Step flashing: Installed where the side of the chimney meets a sloped roof. Cut into brickwork courses, this allows water to run down the roof without penetrating the joint.
- Apron flashing: Positioned at the front of the chimney where it meets the roof slope. It overlaps the roof covering and leads water onto the tiles or slates.
- Back flashing (or back gutter): Located at the rear of the chimney to handle water run-off from higher roof areas.
- Soaker flashing: Used beneath tiles to provide an additional waterproof layer.
Correct installation is key. Poorly laid lead flashing around a chimney is one of the most common sources of persistent roof leaks.
Maintenance Tips for Lead Flashing
Lead flashing is long-lasting, but it still needs periodic maintenance. Here’s how to ensure your flashing continues to perform well:
- Inspect flashing annually for cracks, splits, or loose sections
- Check mortar joints to ensure lead remains securely embedded
- Look for signs of water staining on ceilings near chimneys or dormers
- Keep moss and debris clear from flashings to allow proper water flow
If you spot any issues, professional repairs from a qualified roofing contractor like Gamston Roofing Repairs in Gamston, Nottingham are strongly recommended.
Conclusion
Lead flashing is an essential yet often overlooked part of any roof, especially around dormers and chimneys where leaks are most likely to occur. When installed and maintained correctly, it ensures your roof stays watertight and extends the life of your entire roofing system.
At Gamston Roofing Repairs, we specialise in all aspects of lead flashing installation and repair for properties throughout Gamston, Nottingham. Whether you’re dealing with leaks around a dormer window or need chimney flashing replaced, our team offers reliable and skilled solutions tailored to your home’s needs.
Call us on: 0115 647 1193
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