Repointing a chimney stack sounds like a simple job, and in principle it is, but getting it right on the older brick common in Lawrence Hill takes more judgement than it might first appear. Done properly, it can add decades to the life of a stack; done poorly, it can actually accelerate the very decay it's meant to stop, which is a frustrating outcome for what looked like a routine job booked without much thought.
The process starts with raking out the failed or eroded mortar to an adequate depth, typically two to three times the width of the joint, so the new mortar has a proper key rather than sitting as a thin surface layer over material that's still failing underneath. This step is often rushed on lower-quality jobs, and it's usually the reason repointing fails again within a few years rather than lasting properly, which can be hard to spot until the exact same problem resurfaces a season or two later.
Mortar choice is just as important. Many of the terraced properties across Lawrence Hill were built with softer, more porous brick suited to a breathable lime mortar, rather than the hard cement mixes commonly used in modern construction. Repointing older brick with the wrong mortar can trap moisture inside the wall, and over time that trapped moisture causes the brick face itself to spall, turning what should have been a straightforward mortar job into a brickwork repair a few years down the line, at considerably greater expense than getting it right the first time round.
Getting the colour and joint profile right also matters, particularly on a stack that's clearly visible from the street or from neighbouring properties, which describes most of the terraced housing in the area. Repointing that doesn't match the surrounding brickwork in tone or finish can look conspicuously out of place even when it's structurally sound, undermining an otherwise good piece of work purely on appearance and drawing unwanted attention to a repair that really should have blended in seamlessly.
Because chimney repointing usually requires scaffolding to do properly and safely, it's sensible to have the rest of the stack, including the flashing, flaunching and pots, checked at the same time, since any other issues found are far more cost-effective to address while access is already in place rather than in a separate visit later, once the scaffold has already come down and gone.
If the mortar on your chimney looks eroded, crumbly or lighter than the surrounding brick, it's worth having it assessed before it gets any further along and starts affecting the bricks themselves rather than just the joints between them. A short inspection now can save a much bigger job later, and it costs nothing to find out where your stack currently stands. Brunel Roofing Bristol repoints chimneys across Lawrence Hill using mortar matched carefully to the property, with a free inspection to start.
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