Chimney & Leadwork in Derby

The chimney stack is the tallest, most exposed part of the roof, so it takes the hardest weathering from driving rain and winter freeze-thaw, and it is surrounded by lead flashings, soakers, valleys and mortar pointing that all age and fail. On Derby's inner terraces the stacks are also tall party-wall structures with lead-lined valleys running between the rows, giving many more junctions where water can find a way in. That is why a stain on a chimney breast almost always traces to the stack rather than the slates or tiles around it.

As a general UK guide rather than a fixed figure, chimney repointing commonly falls in the low hundreds to around a thousand pounds depending on the size and height of the stack, the access needed and how much of the pointing has failed. A tall or awkward terrace stack needing full scaffold costs more than a low, accessible one. We give you a fixed written quote after the free survey, once we have seen the stack and the extent of the failed mortar, rather than a guessed figure over the phone.

Repointing rakes out and renews the failed mortar joints on a stack whose brickwork is still sound, and it is the right, cheaper answer where only the pointing and flaunching have gone. Rebuilding is needed where the brick itself has spalled, eroded or begun to lean, at which point new mortar alone will not hold, and the stack is taken down to a sound course and rebuilt in matching brick. We recommend a rebuild only where the brickwork genuinely requires it, so you are not paying for the bigger job unnecessarily.

Lead fails through age, through fatigue as it expands and contracts with heat and cold, and through poor original detailing such as over-long bays that cannot move without splitting. We replace it in the correct code of milled lead to BS EN 12588, with step flashings cut into the brickwork joints, soakers interleaved where the roof meets the stack, and the apron and back-gutter formed to carry water away. Forming it properly, in the right code and bay lengths, is what makes the junction last decades rather than years.

A mortar fillet or a smear of mastic across the roof-to-stack joint is a very short-lived fix on Derby's freeze-thaw exposure, because that junction moves with temperature and a rigid patch cracks and lets water straight back in. It might look sealed for a few weeks but it fails again by the next cold spell, which is why we re-dress or renew the flashing in lead rather than patching over it. Proper lead costs more than sealant but stops the leak recurring, which is the point of doing it at all.

A party-wall stack straddling the boundary of two terraces serves and weathers as a single structure, so responsibility for its repair is usually shared between the two households, and the practical answer is to survey and repair the whole stack rather than only one side. Repairing just the half above the house that called leaves the other side tired, so the next leak follows soon after over the neighbour. We are happy to set out the scope clearly so both parties can see what the stack needs.

A lead valley is the lead-lined channel where two roof slopes meet and carry water away, and soakers are small lead pieces interleaved course by course where a pitched roof abuts a wall or stack. On Derby's inner terraces the lead-lined valleys and box gutters running between the rows are among the most common leak points, because the lead splits and fatigues with age. We re-form them in fresh lead to BS EN 12588 in correctly-sized bays so the metal can expand and contract without cracking again.

A lead flashing renewal on a single stack is often a half-day to a day's work, chimney repointing typically one to two days depending on size and access, and a full stack rebuild usually two to four days plus scaffold, which is booked separately. Weather affects the programme, since lead dressing and mortar work both suffer in heavy rain. We give you a realistic timescale in the written quote once we have seen the stack and worked out the access it needs.

Most chimney and leadwork needs proper scaffold access rather than ladders, because the work is at the highest point of the roof and needs a safe platform to do it correctly, and on a tall terrace stack that usually means a scaffold to the ridge. The scaffold is normally booked and priced as a separate item, and we set it out clearly in the quote so you can see what the access costs. Working off a safe platform is also what lets the leadwork be dressed properly rather than rushed from a ladder.

Yes — where a stack is redundant and no longer serving a working fire or flue, it can be removed down to roof level or lower and the roof made good and weathertight over the gap, which also removes a future source of leaks and repointing. Some owners prefer to keep a stack for the look of the street, particularly in a terrace or conservation setting, and that is a fair reason to repoint and re-lead it instead. We set out both options at survey so you can decide.