Newmarket Roofers rebuilds chimney stacks for homeowners in Fordham, and we know that the work done after a rebuild is just as important as the rebuild itself.
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Once a chimney stack has been properly rebuilt - courses relaid, pot reseated, new flaunching formed, flashings dressed - many homeowners assume the job is done and give the chimney no further thought. That approach is understandable, but it is also how a chimney ends up needing another expensive rebuild sooner than it should. Simple, periodic checks carried out from the ground take minutes and can prevent the kind of deterioration that requires scaffold and a large bill to fix.
We cover Fordham and the surrounding area from our base in Newmarket. This page sets out what good chimney aftercare looks like, and what you can do yourself - safely, from the ground - to stay ahead of problems.
A chimney stack is permanently exposed. Rain hits it from every direction, frost expands any water that has entered the mortar joints, and the thermal cycling of a working flue adds movement. The flaunching - the mortar collar formed around the base of the pot - is particularly vulnerable because it is a relatively thin section of mortar with no reinforcement, exposed on its upper surface to everything the weather delivers. Even a well-formed flaunching will eventually develop fine cracks. If those cracks are caught early and filled, the underlying brickwork remains dry. If they are left, water gets in, the freeze-thaw cycle widens the cracks, and within a few winters the flaunching fails in sections.
Mortar joints in the brickwork follow the same pattern. The joint is the weakest point in the stack, and that is by design - the mortar is softer than the brick so that movement cracks the joint rather than the face of the brick. But an open joint is an entry point for water. Catching open joints early means a roofer can repoint the affected area from scaffold for a modest cost, rather than waiting until multiple courses have been saturated through repeated wet winters and need relaying.
You do not need to go anywhere near a ladder to keep an eye on your chimney. A regular look from the ground with binoculars - or simply a careful eye from an upstairs window - is enough to spot the early warning signs. Look for the following:
Doing this check twice a year - typically in autumn before winter weather sets in, and again in spring - gives you the best chance of catching problems while they are still minor.
If a ground-level check reveals something that concerns you - a cracked flaunching, a pot that has shifted, a section of missing mortar - the right response is to call a roofer and ask them to get on scaffold to have a proper look. Do not attempt to access the chimney stack yourself using a ladder. The top of a chimney stack is not a safe working position without proper scaffold, and a ladder is not an appropriate way to carry out mortar or flaunching work at that height.
A roofer who goes up to inspect a recently rebuilt or repointed chimney and finds only minor deterioration in the flaunching can typically address it in a short visit. That visit costs a fraction of what a full scaffold-and-rebuild job costs. The economics of early intervention are straightforward.
The flaunching is the most maintenance-sensitive part of a chimney stack because it is formed entirely in mortar, has no structural support beneath it beyond the top course of brickwork, and sits in a position where water pools if the slope is not steep enough. A well-formed flaunching slopes firmly away from the pot on all sides. If the slope is shallow or the mortar has been trowelled with hollow sections, it will fail faster.
When having any chimney work done, ask the contractor about the slope of the new flaunching before they come off scaffold. A flaunching that sheds water freely from the pot will last many years longer than one that allows water to sit in a shallow dish around the base of the pot.
The lead flashing where the stack meets the roof is a separate maintenance item from the stack itself. Lead is a durable material that lasts many decades when correctly installed, but the pointing that holds the lead into the mortar joints of the stack can open up over time. When it does, water can track behind the lead and into the roof structure, appearing as a damp patch on the chimney breast below - often mistaken for a problem with the stack itself.
A visual check on the flashings from the ground will show lead that is lifting at the edge or pulling away from the stack. If you see this, it needs a roofer's attention. The fix - resetting the lead and repointing the joints that hold it - is much less disruptive than dealing with water damage to a ceiling or chimney breast.
A chimney that is no longer in use still needs to be maintained, or properly capped. An open, unused flue draws rain, debris, and birds directly into the roof structure. The standard approach is to fit a half-round ventilated cap that keeps weather and wildlife out while allowing enough airflow to prevent condensation building up in the flue. If you have had a chimney rebuilt and the flue is no longer in use, ask the contractor about capping as part of the job.
We work across Fordham and the surrounding area. If a recent chimney rebuild needs a follow-up check, or if a ground-level inspection has shown something that concerns you, call Newmarket Roofers and ask for a scaffold inspection so you know exactly what needs attention before it becomes a larger problem.
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Call any time. Calls are answered day and night and passed straight to our roofers.
