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Lead flashing creates the weatherproof junction between your chimney stack and the surrounding roof.
When flashing cracks, lifts, becomes loose or deteriorates, rainwater can enter the gap between the chimney and roof covering. This is one of the common causes of leaks around chimney breasts and adjoining ceilings.
Environ provides chimney flashing repair across London, including work to lead flashings, soakers and aprons.
The correct solution depends on the condition of the existing leadwork and surrounding roof. In some cases, an isolated repair may be appropriate; in others, deteriorated flashing may need to be replaced to create a reliable weatherproof detail.
Problems with chimney flashing are not always visible from ground level.
Possible warning signs include:
It is important to identify the actual source before carrying out work because water around a chimney can also result from damaged masonry, pointing, chimney pots or surrounding roof materials.
Mortar joints naturally deteriorate as chimneys are exposed to rain, frost, wind and temperature changes.
Once pointing begins to break down, water can penetrate the masonry, and further deterioration can follow.
Chimney repointing involves removing defective mortar where necessary and reinstating sound joints to help protect the stack and maintain its stability.
Environ can assess deteriorated chimney pointing, along with the flashing and surrounding roof, so that related defects can be dealt with together where appropriate.
Cracked, spalled or deteriorated brickwork should not be ignored, particularly on an exposed chimney stack.
Moisture entering damaged masonry can contribute to further breakdown during periods of freezing and thawing.
Our chimney repair service includes the replacement of damaged brickwork, mortar and render where required.
The extent of repair will depend on the condition and stability of the existing chimney.
Cowls and vents can be installed for a range of purposes depending on the chimney and whether the flue remains in use.
Environ can install suitable chimney cowls and ventilation components as part of its broader chimney repair service.
We also offer bird-proofing solutions where birds are accessing or nesting around vulnerable chimney areas.
Because chimney stacks extend above the roofline, they are particularly exposed to high winds and severe weather.
Storms can affect pots, flashing, mortar, and already weakened areas of masonry.
If part of a chimney appears loose, has visibly moved, or debris has fallen from the stack, avoid trying to inspect it from roof level yourself.
A professional assessment can determine whether straightforward repairs are required or whether the chimney needs more substantial remedial work.
A chimney should not be considered in isolation from the roof surrounding it.
Leaks may involve a combination of deteriorated flashing, damaged slates or tiles, defective pointing and vulnerable roof junctions.
Because Environ provides both chimney and wider roofing services, the surrounding roof can also be assessed where required rather than addressing only one component of the problem.
If you have noticed water ingress around your chimney, deteriorated leadwork, or visible damage to the stack, arranging an early inspection can help prevent further deterioration.
Environ provides chimney flashing repair and chimney repairs throughout London.
Call 020 3971 1901 to arrange an assessment.
