Newmarket Roofers carries out chimney rebuilds for homeowners in Soham, tackling stacks that are leaning, crumbling, or letting water into the property.
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When a chimney starts to show obvious problems - spalling bricks, open mortar joints, a cracked flaunching, or a pot that is sitting at an angle - the first question is always whether a repair will be enough, or whether the whole stack needs to come down and be rebuilt. The honest answer depends on what is actually wrong, and that can only be confirmed from scaffold level.
We cover Soham and the surrounding area from our base in Newmarket. Here is how to think through the repair-or-rebuild question yourself.
Not every chimney problem needs a full rebuild. Repointing - cutting out deteriorated mortar joints and replacing them with fresh mortar - is a legitimate, long-lasting repair when the underlying bricks are still sound. If the joints are the issue but the brickwork itself is intact and the stack is plumb, repointing from scaffold will sort the problem for many years.
Flaunching replacement is another repair that makes good sense on its own. The flaunching is the sloped mortar collar formed around the base of the chimney pot where it sits on the stack. It takes constant exposure to rain, frost, and thermal movement, and cracking is common. If the flaunching has failed but the rest of the stack is solid, stripping the old flaunching and forming new is a targeted repair that stops water getting in around the pot without the cost of a full rebuild.
Flashing repairs fall into the same category. Where the stack meets the roof slope, lead flashing is dressed into the mortar joints and over the tiles or slates to form a watertight seal. Failed or lifted flashing is one of the most common causes of water appearing on a chimney breast inside the property. Reseating or replacing the lead flashing is a repair job that does not require the stack itself to be touched.
There are situations where a repair is the wrong choice, not because of cost, but because it will not hold. A stack that has begun to lean is a structural problem, not a surface one. Repointing a leaning stack does not address why it is leaning. The movement that has caused the lean will continue to open up any new mortar joints over time, and eventually the stack becomes a falling hazard. At that point, a rebuild is the only answer.
Widespread spalling - where the face of the brick is breaking away - tells you the bricks themselves have taken in water over many freeze-thaw cycles and the material is degrading. Repointing the joints of a stack where the bricks are spalling throughout is largely wasted effort. The bricks will continue to deteriorate, and the pointing will fail again in a short time because the substrate is not stable.
If the core of the stack has become hollow or fractured - something that can only be confirmed from scaffold - then a surface repair on the outside gives the appearance of a fix without addressing the structural loss inside. A rebuild is required.
One of the most important things to understand about chimney assessment is that what you can see from the garden is not the whole picture. A stack can look reasonably intact from ground level and still have serious problems in the mortar joints on the faces you cannot see, in the flaunching where it meets the pot, or in the structural core of the stack. This is why any honest assessment should be done from scaffold, not from the pavement with binoculars.
Chimney rebuilds in Soham and the wider area around Newmarket typically cost in the range of £1,500 to £4,000 or more for a full rebuild, depending on height and access. A targeted repair such as repointing or flaunching replacement will cost considerably less. Getting the right answer to the repair-or-rebuild question before committing to a price is how you avoid paying for too much - or too little.
Where a rebuild is needed, the process starts with erecting scaffold to the full height of the stack. The pot and flaunching are removed. Courses of brickwork are taken down until the contractor reaches masonry that is genuinely sound - not just visually acceptable, but structurally solid. New courses are then laid in fresh mortar, selected to match the porosity of the existing brickwork rather than being harder than the surrounding material. The pot is reseated on new flaunching, flashings are checked and re-dressed or replaced, and the scaffold is removed once the work is complete.
The materials used matter. Matching the brick as closely as possible to the existing stack avoids the problem of a harder modern brick trapping moisture in the softer surrounding courses. The mortar mix should be weaker than the brick so that any future movement cracks the joint rather than the brick face - exactly as it is supposed to.
Before the scaffold comes down, you should be able to see the completed stack clearly. Check that the pot is seated correctly and the flaunching slopes away from the pot on all sides. Look at the flashings where the stack meets the roof - the lead should be neatly dressed and tucked into the mortar joints. If any of this is not visible or not clearly finished, ask the contractor to show you before they remove the scaffold, because once it is down, access to the stack is gone.
If you are unsure whether your chimney needs a repair or a full rebuild, call Newmarket Roofers and ask for a scaffold inspection so you can get an honest answer before committing to any cost.
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Call any time. Calls are answered day and night and passed straight to our roofers.
