Leadwork is used because it can be dressed into complex roof junctions while remaining durable and weather-resistant. Its flexibility is also the reason it needs correct sizing and fixing: lead expands and contracts with temperature, and oversized or over-fixed pieces can fatigue and split.
We repair and renew roof leadwork around Crawley at chimneys, wall abutments, valleys, dormers and other weathering details.
Where lead is used on a roof
Typical details include chimney aprons, step and cover flashings, soakers beneath tiles or slates, back gutters, valleys, dormer cheeks and weatherings around roof penetrations.
Each detail has a water path. Good leadwork does not merely cover a joint; it collects or deflects water and returns it safely onto the roof covering.
Lead codes and sheet thickness
Rolled lead sheet is supplied in different code weights. The appropriate code depends on the detail and sheet dimensions rather than one grade being used everywhere. Traditional guidance commonly uses Code 4 for many flashing applications, with other codes used for soakers or larger weatherings as appropriate.
We follow recognised leadwork guidance and the actual geometry of the detail rather than using a thick sheet to compensate for poor design.
Allowing for thermal movement
Lead moves as temperatures change. The Lead Sheet Training Academy guidance limits sheet and flashing dimensions and uses laps, drips and joints so pieces can move without tearing themselves apart.
This is why a very long continuous strip or face-nailed edge can fail even when it looked neat on installation day.
Common leadwork failures
Split corners, fatigue cracks, loose cover flashings, failed pointing, short laps and poorly dressed edges are common problems. Sealant smeared across a moving split can be a short-term measure but usually does not restore the movement detail that the lead requires.
We also check the material beneath the lead because rotten boards or loose masonry can undermine an otherwise good repair.
Leadwork on older properties
Lead is common on historic roofs because it can form complex durable weatherings. Retaining sound original lead can be worthwhile where it remains serviceable, while replacement should respect the existing roof materials and visible character.
Where a building is listed or a detail has heritage significance, additional conservation advice or consent may be appropriate.
The visible flashing may be only half the detail
At a wall beside a tiled or slate roof, water protection may depend on individual soakers beneath the covering as well as the flashing visible from outside. Replacing the outer strip without checking those concealed pieces can leave the original leak unresolved. Chimney back gutters and valley linings also rely on suitable support and a clear discharge path. We inspect how the pieces overlap and where water leaves the junction before deciding which part needs repair or renewal.
Repairing a split without repeating the cause
A split can indicate restricted movement, an oversized sheet or a corner formed under stress. Welding or patching the visible crack may be appropriate in some circumstances, but it does not automatically correct the design beneath it. Replacement work should use suitable sheet sizes, fixings and joints for the detail. We also check the timber or masonry support and the method of securing cover flashing. Sealant can be part of a specified detail; it should not be expected to hold an entire moving weathering together.
A neat finish that remains maintainable
Lead changes appearance as it weathers. A repair may initially differ from older material, so matching the geometry and proper drainage takes priority over a forced colour match. Record which areas have been renewed, particularly if part of a chimney or valley remains original. That makes future inspection more useful and avoids assuming an entire roof junction is new.
Questions homeowners often ask
Thermal fatigue, oversized pieces, restricted movement, poor support or previous repairs can all contribute. We inspect how the flashing is fixed and jointed, not just the crack.
Local repairs can be possible depending on location, condition and the cause of failure. Badly fatigued or incorrectly detailed lead is often better renewed in properly sized pieces.
Lead codes identify sheet weight and thickness. Code 4 is widely used for many flashing details, but the correct code depends on the application and sheet dimensions.
The way flashing is secured and pointed depends on the detail. Traditional guidance uses mechanical restraint such as wedges and appropriate pointing/sealant methods rather than relying on mortar adhesion to the lead alone.
Technical guidance and further reading
What affects the size and cost of the job?
Chimney, pointing and leadwork jobs are often small in area but detailed and access-sensitive. Height, scaffold requirements, the condition of masonry and the complexity of flashings or weatherings can matter more than the quantity of raw material.
- Height and safe access around the stack or abutment
- Condition of brick, stone and existing mortar
- Extent and type of existing leadwork
- Need to coordinate pointing, flaunching and roof-covering repairs
- Complex corners, back gutters, valleys or dormer details
- Requirement to match older or heritage materials
A quote you can actually compare
The scope should separate masonry repair from leadwork and roof-covering work so you can see what is actually being renewed. Where lead is replaced, the detail and area should be described rather than treated as an unspecified strip of metal.
We prefer defined scopes to vague allowances. If an important part of the roof cannot be confirmed until material is lifted, that uncertainty should be explained before work begins rather than appearing as a surprise at the end.
What we inspect and work on
Chimney flashing
Wall abutments
Valleys and weatherings
Lead repair and replacement
Integration with tile and slate roofs
Related roofing services
More questions about this service
Are flashing and soakers the same thing?
No. Soakers sit with individual courses beneath the covering at certain junctions. Cover or step flashing protects the upper edge and wall connection. Both may be needed for the full weathering detail.
Does thicker lead always make a better repair?
No. Thickness must suit the application, sheet dimensions and supporting design. Correct movement allowance, laps and fixing remain essential whatever code of lead is selected.