Lead flashing has a genuinely long working life when it's installed correctly, which is partly why its eventual failure can catch homeowners off guard, showing up as a leak years or even decades after the roof was last worked on. Recognising the signs early makes replacement a planned job rather than an emergency one.
The most visible sign is lead that's lifted away from the brickwork it was originally dressed into, usually where the mortar joint holding it in place has weathered out over time, leaving a visible gap along the edge of the flashing. Cracks or splits in the lead itself, particularly at corners and folds where the metal has been worked hardest during the original installation, are another clear indicator, as is lead that's become noticeably thin or has developed a rough, pitted surface from prolonged weathering.
Gaps at the joints between sections of flashing, where separate pieces overlap along a run, are also worth checking, since these joints are a common weak point, especially on longer runs found on wider chimneys. A close look often reveals daylight or a clear seam where water could get behind the lead during heavy rain.
On many of the older properties across Bedminster, flashing that's original to the building can be many decades old, and while lead is a durable material, it isn't indefinite, particularly where it's had to move with a building through repeated cycles of thermal expansion. Once failure starts at multiple points along a run, patching individual sections tends to be a short-term fix rather than a lasting one.
If flashing has failed because of a specific storm event, it's also worth documenting the damage for insurance purposes before any repair work begins, since sudden storm damage is often treated differently by insurers to gradual wear and tear that's built up over years of ordinary weathering. It's also worth checking flashing alongside any back gutter or soaker details on the same chimney, since these related pieces of leadwork are usually installed and age together. A flashing repair carried out in isolation, while a back gutter nearby is quietly failing too, can mean a leak persists even after the visible repair is finished, simply because the actual source was slightly further round the stack than assumed. It's worth noting that lead failure doesn't always announce itself with an obvious leak straight away. Water can find its way behind a small gap in the flashing and travel some distance before it becomes visible indoors, which means the flashing can already be compromised well before any damp patch actually appears on a ceiling or wall. A brief annual look at the flashing, alongside the rest of the roof, is a small habit that can catch this kind of early, hidden failure well before it turns into an indoor problem.
If you've noticed staining near a chimney breast, or simply want ageing flashing checked before it becomes a leak, we carry out free inspections across Bedminster and can advise honestly on repair versus full replacement, with all completed work backed by a 15-year guarantee.
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