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Roofer dressing new lead flashing around a chimney

Lead Flashing & Leadwork

Splits, poor laps and shallow chases cause endless 'mystery leaks' — proper leadwork fixes them once, not annually.
Published by Find Trusted Roofers · Last updated
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About lead flashing & leadwork

Lead sits where roofs meet walls, chimneys, windows and each other. This is where most roof leaks start. Good leadwork is a real skill. It needs the right lead, proper steps cut into the mortar, and shaping that lets the metal move without splitting. Our roofers renew flashings, chimney aprons, back gutters, lead valleys, bay-window tops and porch roofs. They also fix split or lifted lead when a full renewal isn't needed. Since theft or budget sometimes rules out lead, they can also advise honestly on modern alternatives.

How we help

Find Trusted Roofers is a national network that connects UK homeowners with local roofers. Since we are not a roofing contractor, we don't do the work ourselves. Instead, you tell us about your lead flashing job once. We then match you with a roofer in our network who covers your postcode and works on your roof type. Every roofer quotes from their own survey, and you deal directly with them and choose whether to proceed.

We check the roofers in our network against Companies House, and confirm public liability insurance. We also note any TrustMark, NFRC or CompetentRoofer membership. We verify what we can, although we don't guarantee the work itself. The work is always contracted directly between you and the roofer.

Lead Flashing & Leadwork — FAQs

How do I know my flashing has failed?

Damp patches near chimney breasts, or where an extension meets the house, are classic signs. So is staining down interior walls after driven rain. Visibly lifted, cracked or cement-smeared flashing outside is another.

How much does lead flashing repair cost?

Re-dressing or refixing lifted flashing might cost £150–£300. Renewing a chimney's full lead set (apron, steps, back gutter) typically costs £400–£900, depending on access. Lead valleys cost more since tiles on each side must come up.

How long does leadwork last?

Properly specified and fixed lead routinely lasts 60–100 years — usually outliving the roof covering around it. Most 'lead failures' are actually installation faults: undersized code, over-long runs without expansion joints, or mortar smeared over the top.

Is there an alternative to lead?

Yes — composite flashing products, such as flexible aluminium-cored membranes, perform well and cost less. Since they carry no theft value, this matters on churches, schools and unoccupied buildings. A roofer who works both will advise which suits your roof.

Why is there cement over my flashing?

It's a common bodge: cement fillets crack away from both surfaces within a few seasons and trap water behind them. The correct repair is stepped lead flashing chased into the mortar joints — slightly dearer, decades more durable.

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