Chimney repairs, repointing and rebuilds
Chimneys take more weather than almost any other part of a house. Exposed on every side, they lose mortar, crack at the top and leak where they meet the roof. Looking for chimney repairs near you usually starts with a damp patch on a chimney breast or debris in the gutter. ADB SW’s masonry work includes repointing across South Devon. Send photographs of the stack and any signs of damp inside so we can discuss the repair.
Common chimney problems
Most chimney repairs fall into a few categories. Mortar joints erode and let rain into the masonry. The flaunching, the sloping mortar cap around the pots, cracks and allows water down the inside of the stack. Lead flashings at the roof junction lift, split or were never properly dressed. Pots crack, and unused flues without a cap draw rain straight down.
Inside, these defects show up as stains on the chimney breast, damp wallpaper or salts on plaster. Our guide to chimney breast damp and staining explains how to read those signs. Outside, look for open joints, leaning or bowed stacks, loose pots and vegetation growing from the masonry. A stack that leans noticeably needs prompt attention.
Repointing a chimney
Repointing a chimney involves raking out loose and failed mortar to a sound depth and refilling the joints with a mortar suited to the masonry. On older brick and stone stacks, lime mortar is often the right choice because it lets the masonry breathe and moves with it. A hard cement mortar on soft brick can trap moisture and speed up decay of the brick faces.
Repointing is usually combined with renewing the flaunching, checking or replacing pots and cowls, and inspecting the flashings. Doing these together on one access arrangement is more economical than separate visits. Where individual bricks have spalled or cracked, they can be cut out and replaced with a close match before the joints are finished.
Flashings, caps and chimney rebuilds
Lead flashings and soakers form the seal between the stack and the roof covering. When they fail, water gets into the roof space rather than the chimney breast, and the fix is to renew the leadwork properly rather than rely on sealant. Disused flues can be capped with ventilated caps to keep rain out while allowing air to move and the flue to dry.
A chimney rebuild becomes the better option when the masonry is badly decayed, the stack is leaning, or repeated repairs have failed. The stack is taken down to sound brickwork, often to roof level, and rebuilt using matching or reclaimed materials with new flashings and a damp-proof tray where appropriate. Removing a redundant stack entirely is covered on our chimney breast removal page.
Access, cost and arranging a repair
Chimney work nearly always needs scaffolding, often with a platform around the stack. Access is a significant part of repointing chimney cost, alongside the size and height of the stack, how much mortar has failed, the condition of the flaunching and flashings, and whether pots, cowls or bricks need replacing. Shared stacks in terraces may involve neighbours and the access arrangements on their side.
For an enquiry, send photographs of the chimney from the ground, any damp inside, and whether the flues are in use. ADB SW can discuss the scope and provide a written quote. If you want the wider masonry checked at the same time, our repointing page explains how walls are assessed and repointed.
Common questions
How do I know if my chimney needs repairing?
Signs include damp or staining on the chimney breast, open mortar joints, cracked flaunching, loose pots, lifted lead flashings, vegetation growing from the stack or a visible lean.
What affects repointing chimney cost?
Scaffolding and access, the size and height of the stack, the amount of failed mortar, and whether flaunching, flashings, pots or bricks also need work.
Should chimney repointing use lime mortar?
On older brick and stone chimneys, lime mortar is often the right choice because it allows moisture to escape. The mortar should suit the masonry rather than be harder than it.
When does a chimney need rebuilding rather than repairing?
When the masonry is badly decayed, the stack is leaning or repeated repairs have failed. It is taken down to sound brickwork and rebuilt with new flashings.
Tell us about your project
Send the property details and the work you have in mind so the scope can be discussed before a quote is agreed.