Weatherproof junctions formed to move
Defect type identified
We distinguish local damage from fatigue affecting the whole section.
Laps formed correctly
We size overlaps to protect the junction from flowing and driven rain.
Movement allowed
We detail and fix lead with normal thermal movement in mind.
Keep water out where roof surfaces meet
Leadwork protects changes in roof shape and the places where coverings meet chimneys, walls and valleys. These junctions deal with concentrated water flow and movement between materials. Splits, lifted edges, poor laps and failed fixings can open a route beneath the covering. We inspect the lead and nearby roof details to see whether the fault is local or caused by an incorrect arrangement. A lead flashing repair may involve carefully redressing or patching a sound section. Lead that is heavily fatigued, badly sized or wrongly detailed may need replacement instead.
Allow the lead to move without splitting
Lead expands and contracts as temperatures change, so sheets and flashings need correct sizing, laps and fixings. Restricting that movement can cause cracking, while short laps or loose edges may allow driven rain inside. For new work, we form the lead to suit the junction and integrate it with the surrounding masonry or roof covering. For existing work, we compare the condition of the whole section with the practicality of a local repair. We explain why a patch is suitable or why replacement is needed, rather than adding another layer to lead that has already reached its limit.
Frequently asked questions
Can split lead flashing be patched?
A local patch may be practical when the surrounding lead remains sound and correctly detailed. Widespread fatigue, repeated cracking or poor sizing can make replacement the more reliable choice.
Why does leadwork crack after installation?
Lead moves as temperatures change. Sheets that are oversized, over-fixed or unable to move can become stressed. We consider sizing and fixing arrangements when assessing the cause.
Where is leadwork normally used on a roof?
Common locations include chimney junctions, wall abutments, valleys and changes in roof shape. Each detail needs suitable laps and integration with the surrounding covering.