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Protect the roof’s most vulnerable junctions

Chimneys and leadwork
during a complete re-roof.

Chimneys interrupt the roof covering and concentrate water around several junctions. A re-roof is the right time to assess the visible stack, surrounding leadwork and how each detail joins the new covering.

Tiled roofs →Natural slate roofs →

— Practical homeowner guidance

Treat the chimney as a complete junction

Water approaching a chimney has to move around the front apron, side weathering and rear detail before continuing down the roof. The precise arrangement depends on the covering, chimney position, roof pitch and construction.

Existing flashings may be poorly chased, split, patched or formed for a different tile or slate profile. Reusing a detail without checking compatibility can undermine an otherwise new roof.

The survey should also record visible masonry, pointing, flaunching and pots. Roofing work does not automatically include rebuilding or removing a chimney, so the quotation must separate those items clearly.

Roofing guidance from Topline Roofing Shrewsbury.

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— Understand the full roof system

Important details,
explained clearly.

A complete re-roof brings several materials, junctions and practical decisions together. Each section below should be read in the context of your own property and written quotation.

01

Inspect before stripping

Photographs and close inspection can reveal lifted edges, surface splits, excessive sealant repairs and failing mortar chases. Inside the loft, staining near a stack may help identify the affected elevation.

Not every damp mark is caused by the lead itself. Masonry saturation, flaunching, condensation and the roof covering above should also be considered.

  • Lead condition and laps
  • Mortar chase condition
  • Masonry and flaunching signs
02

Match leadwork to the covering

Clay tiles, concrete profiles and natural slate meet a chimney differently. The weathering detail must accommodate the covering’s thickness, course and water channels.

Lead should be formed and supported appropriately rather than stretched across large unsupported areas or relied on as a cosmetic patch.

  • Apron depth and support
  • Side lap arrangement
  • Rear water capacity
03

Decide what masonry work is included

Repointing a chase is different from extensive chimney repointing, rebuilding or replacing pots. If masonry work is required, the quote should identify the elevations and extent rather than use a vague chimney allowance.

Any active appliance or flue must be considered before changing a chimney or ventilation arrangement.

  • Local chase making-good
  • Stack repairs or rendering
  • Pots, cowls and flue status
04

Consider removal carefully

Taking a redundant stack below roof level can remove a difficult external junction, but it is not simply a matter of taking off the visible bricks. Internal support, shared structures, planning controls and ventilation may need professional confirmation.

The new roof area then needs compatible timbers, membrane, battens and covering so that the former opening becomes part of the continuous roof system.

  • Structural support
  • Neighbour or shared-stack issues
  • Planning and flue checks

— Useful questions

Clarify the chimney scope
for your quotation.

Chimney quotations should name the specific weathering and masonry work. Phrases such as ‘sort the lead’ are too vague for a major roof replacement.

Keep the answers with the written scope so that responsibilities, allowances and exclusions are understood before the deposit is paid.

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Useful next steps

More help with
your roof.

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See our roofing work

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How a roof is replaced

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Roof replacement costs

Understand what can affect the quotation.

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You do not need to know any roofing terms. Tell us what you have noticed and we will explain the next step clearly.

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