Lead flashing is one of the most important yet often overlooked components of a roofing system. Its purpose is to form a watertight seal where the roof meets features such as chimneys, walls, and roof junctions. When lead flashing begins to fail, water can enter the roof structure unnoticed, leading to problems that may only become visible once damage has progressed.
At LJ Roofing Criklade, failed lead flashing is a frequent cause of leaks that appear to have no obvious source.
Why Lead Flashing Plays a Critical Role
Lead flashing is designed to accommodate slight movement between roofing materials and adjoining structures. As roofs expand and contract with changes in temperature, lead flexes to maintain a secure seal. When flashing deteriorates or becomes displaced, this seal is broken, allowing water to penetrate vulnerable areas of the roof.
Because flashing protects junctions rather than open roof surfaces, problems can develop quietly and remain hidden for long periods.
Visible Gaps or Lifting at Roof Junctions
One of the earliest signs of flashing failure is visible movement. Lead that has lifted, cracked, or pulled away from the wall or roof covering can no longer channel water safely away.
Even small gaps can allow rain to enter beneath the roof covering, especially during prolonged or wind-driven rainfall.
Persistent Damp or Staining Indoors
Failed flashing often reveals itself through internal symptoms rather than external damage. Water entering at roof junctions may travel along timbers before becoming visible.
Common indicators include:
- Damp patches near chimney breasts or upper walls
- Discolouration on ceilings close to roof lines
- A musty smell developing over time
These signs often appear some distance from the actual point of entry, making professional assessment essential.
Cracks or Splits in the Lead
Over time, lead flashing can develop hairline cracks or splits due to age, repeated movement, or weather exposure. While these may be difficult to spot from ground level, they can significantly reduce the flashing’s effectiveness.
Once lead is compromised, it no longer provides a continuous barrier against moisture.
Water Appearing After Heavy Rain
If leaks only appear during or shortly after heavy rainfall, flashing failure is often the cause. Roof junctions are subjected to high volumes of water during these conditions, and weakened flashing may only fail when under increased pressure.
This intermittent leaking is a strong indication that the flashing is no longer performing as intended.
Deterioration of Surrounding Materials
When flashing fails, nearby roofing materials may begin to show signs of wear. Mortar joints, roof coverings, or internal timbers can all be affected by ongoing moisture exposure.
These secondary signs often point back to a flashing issue that has been present for some time.
Why Professional Inspection Is Important
Lead flashing must be assessed carefully, as surface-level observations may not reveal the full extent of the problem. Professional roofers check how the flashing integrates with the roof covering and adjoining structure, ensuring water is properly directed away.
Correct diagnosis ensures repairs resolve the underlying issue rather than temporarily masking symptoms.
Conclusion
Failed lead flashing is a common cause of roof leaks and hidden water damage. Lifting, cracking, and subtle internal damp signs all indicate that flashing may no longer be providing effective protection. Early identification is key to preventing wider roof deterioration.
For property owners in Criklade, professional roofing expertise ensures lead flashing issues are identified and resolved correctly. LJ Roofing Criklade provides experienced roofing services focused on maintaining watertight roof junctions and long-term roof performance. If you suspect your lead flashing has failed, professional advice is the best next step.
Call us on: 01793 569 197
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