Introduction
Lead flashing is one of the most crucial components of any roofing system, yet it often goes unnoticed—until problems arise. Its job is simple but vital: to seal joints and intersections where the roof meets walls, chimneys, and other structures. But when flashing is poorly installed, incorrectly maintained, or damaged, it can become the starting point for a host of serious roofing issues.
At Bilsthorpe Roofing Repairs, we’ve seen how small flashing faults can lead to big problems across properties in Bilsthorpe and the wider Nottinghamshire area. In this article, we’ll highlight 10 common roofing issues caused by poor lead flashing—and explain why addressing them early is essential for protecting your home.
Key Takeaways
- Lead flashing protects vulnerable roof junctions from water ingress.
- Poor flashing causes leaks, damp, and even structural decay.
- Timely repairs and proper installation help prevent expensive damage.
- Bilsthorpe Roofing Repairs offers expert solutions for flashing and roof repair.
1. Water Leaks Around Chimneys
One of the first places poor flashing fails is around chimneys. Gaps or cracks in the flashing let rainwater seep behind bricks or roofing felt, often going unnoticed until damage becomes visible indoors.
2. Damp Patches on Interior Walls
If flashing is not properly sealed or fitted, water can slowly work its way into the internal structure, leading to staining, bubbling paint, and mould on walls and ceilings.
3. Rotting Roof Timbers
Persistent leaks caused by failed flashing can eventually soak into timber structures. Over time, this moisture weakens rafters, joists, and battens—compromising the entire roof’s integrity.
4. Moss and Algae Growth
Trapped moisture from failed flashing creates a perfect breeding ground for moss, lichen, and algae. This not only looks unsightly but holds moisture on the roof, accelerating decay.
5. Tile or Slate Dislodgement
Water entering through poorly finished flashing can cause fixings to rust or timber battens to rot. As these supports weaken, tiles and slates may shift or fall away entirely.
6. Flashing Lifted by Wind
Improperly fixed lead flashing can be loosened by high winds. Once it lifts, wind-driven rain can penetrate the roof space with ease, especially during storms.
7. Poor Valley Drainage
If flashing in a roof valley is incorrectly angled or damaged, water will not flow freely. Instead, it pools, increasing the risk of leaks and accelerating wear on surrounding materials.
8. Cracking Due to Movement
Lead expands and contracts with temperature changes. Without correct detailing or allowance for movement, it may crack or split—creating new paths for water to enter.
9. Blocked Gutters from Debris Wash-Off
As flashing deteriorates, particles of lead and surrounding materials can wash into gutters, increasing the risk of blockages and overflow near critical roof edges.
10. Shortened Roof Lifespan
When flashing consistently fails to protect the structure beneath, the entire roofing system suffers. From underlay rot to insulation damage, these hidden consequences can significantly shorten your roof’s serviceable life.
Conclusion
Lead flashing might seem like a small part of your roof, but its importance can’t be overstated. When it fails, the knock-on effects range from aesthetic damage to major structural concerns. Identifying and addressing flashing problems early is key to avoiding costly repairs and keeping your property protected.
At Bilsthorpe Roofing Repairs, we specialise in diagnosing flashing faults and providing long-lasting, professional solutions across Nottinghamshire. If you suspect your flashing may be failing—or simply want peace of mind—get in touch with our expert team today.
Call us on: 01623 572 795
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