Chimney Repairs

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Our team of experts at Sontech Roofing of Doncaster offers a thorough chimney repair and maintenance service, and they have experience with every conceivable kind of chimney.

Here are a few of the chimney repair and upkeep services offered by Sontech Roofing of Doncaster:

Repointing is a regular chimney repair that we carry out. Brickwork that has open joints should be soundly scraped out and repointed. The spaces between the chimney brickwork are filled with sand/cement mortar using a pointing trowel to achieve the desired finish, such as weather struck.

Poorly maintained chimneys may have cracks that run vertically and give the impression from the ground that the chimney is sagging or splaying at the top. Chimney pots that are angled or ‘out of line’ would be early signs of chimney degradation. A damaged chimney flaunching, which is the sand/cement finish that holds the chimney pots or terminals to the chimney top, would allow water to enter the internal chimney brickwork and flue. Always pay attention to preventing water from entering chimney flues. A brick chimney or flue system’s structural integrity can suffer if water intrusion freezes during colder winter months.

A typical household brick chimney is 9″ (225mm) square. One fireplace aperture is served by one chimney flue. The interior brickwork slopes down from the fireplace’s breadth at the lintel to its size reduction at the base of the 9″ square flue above the fireplace opening, also known as the “Builders opening.” The “brick collect” refers to this portion of the fireplace. From this point, the flue climbs until it comes to an end at the chimney head, often connecting to other flues in the “Chimney breast” by running above through bedrooms or fireplace openings. One brick’s width, or 100mm, divides the flues within the chimney breast. This division’s masonry is referred to as the “midfeather.”

The flue terminal for a brick-built household flue is a chimney pot. A chimney pot typically has an internal diameter of 200 mm (8 inches) and rises 300 mm (12 inches) above the chimney masonry. In the London and Essex region, the majority of neighbourhood semi-detached houses feature a common brick chimney stack on the party wall that has eight chimney flues—four for each property—each with its own terminal, the chimney pot.

A chimney pot that is leaning or out of alignment or in the worst-case scenario, has vertical or visible cracks around the circumference, typically at the chimney pot base above the flaunching, would be considered to have chimney pot defects that need to be addressed. Movement in the chimney framework that puts strain on the pot or earlier chimney fires that heated the pot to as much as 1100 degrees Celsius are two causes of chimney pot breaking (or a possible chimney fire that might have happened before the current owner).

• Any undesirable birds won’t be able to become stuck behind a closed fireplace or fall into the flue and possibly enter the house if there is a chimney cap in place.
• A chimney cap helps minimise the degradation of the chimney lining by preventing rainwater from penetrating the chimney flue.

Chimney terminal, chimney rain cap, and chimney cowl (chimney cowl installation)

Typically, a chimney cowl is intended to stop rainfall from getting into an operational flue or chimney system. Other varieties of cowls or rain caps come with a mesh bird guard that keeps birds from landing in your chimney. Any non-condensing chimney system would benefit from a rain cover with bird protection mesh, and this is something that should be taken into consideration while doing routine or annual chimney servicing or inspection.

When a chimney has no draw and flue gases are moving downward and into the building, the situation is referred to as “chimney downdraft” , the opposite of a chimney that is operating properly. This carries significant risks.

• Air pressure or pressure zone differences are the root cause of downdrafts.
• Can result from the installation of air extraction fans in a building, like a kitchen extractor fan.
• Air flow and pressure zones around the chimney pot or terminal can alter as a result of loft additions or nearby higher buildings.
• Downdraft frequently affects chimneys that have had their height decreased.

To pinpoint the precise reason for a property’s downdraft, a chimney check on-site would be necessary. An anti-downdraft cowl is one potential solution.

Designs for downdraft/downdraught cowls vary widely. A “spinning cowl” is the most typical and is typically regarded as the best because it also boosts chimney draw. This louvred ball-shaped cowl, which spins in the wind, increases chimney draft by drawing air up through the chimney flue.

The size and form of the chimney, along with the kind of house it is constructed on, will all have an impact on how much the repair will ultimately cost.

The most frequent chimney repair tasks and their estimated costs are listed in the table below.

As the table shows, there are a variety of chimney repair tasks, and your chimney may require one or more of them to be fixed. The final cost of the project will depend on the type of work and the size of the chimney.

When planning your budget for chimney repairs, don’t forget to account for the cost of the scaffolding.

Doncaster Roofing Contractors

Many people put off fixing their faulty chimney until it is completely damaged, only to discover that a squirrel has gotten into it and found its way out, or that a bird has gotten into it and is struggling to find its way out (or a bunch of other problems).

If you need to repair your faulty chimney, our roofers are available 24 hours a day, seven days a week. So, give us a call today at 0115-647-0400, or fill out our contact form on this page, and one of our experts will promptly respond to your request.

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