A crumbling or leaning chimney stack is a safety risk and a source of leaks. We rebuild chimney stacks in Cambridge from the ground up or from the roofline, using matching brickwork, fresh mortar and new lead flashings to make the stack weather-tight again.
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A chimney stack takes more punishment than almost any other part of a roof. It sits proud of the roofline, fully exposed to rain, frost and wind on every side. Over time, mortar erodes, bricks crack and spall, and the stack can begin to lean or separate from the main structure. When that happens, a repair is no longer enough and a rebuild is the right answer.
Chimney rebuilds are needed on all sorts of Cambridge properties. We work on many different types of property, as well as on the older village properties in the surrounding area.
The scope of a rebuild depends on where the deterioration starts. Some stacks only need to be taken down and rebuilt from the flaunching at roof level, with the brickwork below the roofline still sound. Others need to come down further, to a course of bricks that is genuinely solid. In either case, the work follows the same general sequence.
The leadwork is as important as the brickwork. A poorly fitted flashing is the single most common reason water gets into a property at chimney level. We form flashings from code 4 or code 5 lead sheet, cut into the mortar joints of the stack and secured with lead wedges before being pointed up. This is not a job where self-adhesive flashing tape is a like-for-like substitute.
Repointing and patching can extend the life of a chimney that is structurally sound, but once bricks have cracked through, the stack has moved or the core is compromised, repeated small repairs become false economy. Water gets into the mortar joints each winter, freezes, expands and opens the joint wider. A stack that is repointed today but is fundamentally unstable will need the same work again in a few years.
There is also a safety consideration. A leaning or bulging chimney stack that has not been properly assessed is a falling hazard. Chimney falls cause serious damage to roofs and guttering below, and present an obvious risk to anyone nearby. Getting a roofer to look at the stack before it reaches that stage is always the better option.
If you have a fireplace that is still in use, a rebuild also gives the opportunity to inspect the flue liner and have any swept debris cleared before the new stack goes up. We do not carry out flue lining ourselves, but we can flag any obvious concerns before work begins.
Frost damage to brickwork and mortar is a particular problem on chimney stacks because they dry slowly, stay damp for longer and have no insulation behind them. Exposure to weather varies from property to property, and a stack in a sheltered spot can still show the same wear over time.
Older housing often has soft, handmade brick, which can be more vulnerable to moisture than modern engineering brick. Once the mortar starts to go, soft brick deteriorates quickly. Matching brick is not always straightforward, but it is worth taking time to find a reasonable match rather than using a contrasting brick that spoils the look of the property.
When you get in touch, we will arrange to come and look at the stack. Most chimney assessments require access to the roof, so we will bring a ladder or set up scaffold if needed to get a proper look rather than relying on a view from the ground. We can tell you at that point whether a partial or full rebuild is needed and what materials will be involved.
A straightforward chimney rebuild on a standard domestic property, taken down to roof level and rebuilt with new lead flashings, typically costs in the region of £1,500 to £3,500 depending on the height and size of the stack, the number of flues, access requirements and whether scaffold is needed. Larger stacks, or those needing scaffold for multiple elevations, will cost more. We will give you a specific figure once we have seen the job.
A chimney stack rebuilt in sound brick with proper lead flashings and fresh flaunching should remain weathertight for many years without needing significant attention, provided the pointing is checked periodically and any cracking caught early.
If you can see cracks in the stack, white staining (efflorescence) on the brickwork, damp patches on a chimney breast inside, or the stack looks like it has moved, do not leave it. Call us to arrange a roof-level inspection and we will give you an honest assessment of what is needed.
A chimney rebuild in Cambridge typically costs between £1,500 and £3,500 for a standard domestic stack, depending on size, height and access requirements.
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Call any time. Calls are answered day and night and passed straight to our roofers.
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