Chimney Repairs Ayrshire
Chimneys are one of the most weather-exposed parts of any building. Standing proud of the roofline, they face the full force of Atlantic gales and Scotland's frequent rainfall, and the mortar that holds them together is subject to relentless freeze-thaw cycles every winter. IC Roofing carries out chimney repairs across Ayrshire — from routine re-pointing and flaunching repairs to more significant structural work on stacks that have been neglected or storm-damaged.
Chimney work requires working at height with appropriate access and a proper understanding of masonry repair techniques. We do not rush chimney repairs — incorrect mortar choice or poorly executed re-pointing can cause more damage than it prevents. We assess each chimney carefully and use the right materials and methods for the type of masonry involved.
Common Chimney Problems
Deteriorated Pointing
The mortar joints between bricks or stones erode over time, particularly on the exposed upper sections of the stack. Once joints become open, water enters the masonry during rain and can freeze and expand during cold weather, accelerating the breakdown of both the mortar and the masonry units themselves. Re-pointing with an appropriate mortar mix restores the weatherproof integrity of the stack.
Cracked or Damaged Flaunching
The flaunching is the sloped mortar bed at the top of the chimney stack that holds the chimney pots in place and directs water away from the stack top. Flaunching cracks and shrinks over time, allowing water to pool around the pots and penetrate the top of the stack. We cut out and re-bed deteriorated flaunching and re-seat chimney pots where necessary.
Failed Lead Flashings
The lead flashing at the junction between the chimney and the roof is the most common source of chimney-related water ingress. Step flashings and back gutters that have been bodged with sealant or have lifted and cracked will allow water to run directly down the back of the chimney and into the roof space. We cut out failed flashings and install properly dressed lead — not silicone.
Cracked or Leaning Stacks
In more serious cases — particularly following storm damage or on chimneys that have been neglected for many years — the stack itself may have developed structural cracks or begun to lean. This requires careful assessment and, in some cases, partial rebuilding from the roofline up. We will always give you an honest assessment of whether repair or rebuilding is the appropriate course of action.
Re-Pointing Explained
Re-pointing is a precision job. Cutting out old mortar without damaging the surrounding masonry requires care, and using the correct mortar specification is essential — particularly on older stone-built properties where a modern hard cement mortar would be too rigid and would cause damage to the stone.
For traditional stone chimneys, we typically use a lime-based mortar that is softer than the stone, allows some movement, and is breathable. For brick chimneys built in the post-war period onwards, a modern sand and cement mix of appropriate strength is usually specified.
The joints are raked out to a depth of at least 15–20mm to give the new mortar a good key, dust and loose material is cleared, and the joints are dampened before the new mortar is applied. The mortar is then finished to a weather-struck profile that sheds water away from the joint.
Safety Note
Chimney work at roof level should always be carried out from a properly erected scaffold or with appropriate access equipment — not from a ladder propped against the chimney itself. We do not work in a way that compromises safety. If a chimney is in a deteriorated condition, it should not be accessed from a ladder. We will always ensure that access to your chimney is safe before work begins.
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Learn more →Frequently Asked Questions
Re-pointing is the process of raking out deteriorated mortar joints between the brickwork or stonework of a chimney stack and replacing them with fresh mortar. The mortar in chimney joints is exposed to the most severe weathering of any part of the building — freeze-thaw cycles, driving rain, and wind — and can deteriorate significantly faster than mortar lower on the walls. When the joints are open, water gets into the masonry, causing accelerated decay and, in winter, frost damage. You should consider re-pointing when the mortar is visibly eroded, crumbly, or missing from the joints — typically every 20–30 years on an average chimney, but sooner on properties in more exposed positions.
For a chimney attached to a working flue, cracked or deteriorated mortar joints and flaunching can create several risks. Water penetration can damage the flue liner and, in severe cases, allow combustion gases to escape into the roof space or property. There is also a structural risk if mortar failure is advanced — loose sections of masonry can fall. We would strongly advise having a chimney inspected by a sweep and a structural assessment carried out before using a flue on any chimney that shows visible external deterioration.
Yes. A redundant chimney still needs to be structurally sound and weatherproof. It may not have the risks associated with an active flue, but failing mortar, cracked flaunching, or a broken capping stone will still allow water into the stack, which can travel down into the roof structure and ceilings below. A disused chimney should be properly capped or cowled to prevent water entry and bird nesting, and inspected periodically to ensure the masonry remains sound.
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