Flaunching is one of those terms most homeowners in Henbury have never heard until a roofer mentions it — it's the mortar fillet moulded at the top of a chimney stack, sloped to shed water away from the pot and the brickwork beneath it. Despite being a fairly small and unglamorous feature, it plays an outsized role in keeping the whole stack weatherproof, and its condition is one of the first things worth checking during any chimney inspection carried out on a Henbury property.
Because flaunching sits at the very top of the chimney, fully exposed to sun, frost, and driving rain, it tends to weather faster than the rest of the stack. Cracks develop as the mortar ages and contracts, and once water gets into those cracks and freezes, the damage accelerates quickly. A failed flaunching often shows up first as a wobbly or leaning pot, since the flaunching is what actually holds the pot secure at the top of the stack — a loose pot is very often a sign of flaunching failure rather than a fault with the pot itself, something worth bearing in mind before assuming a pot simply needs swapping for a new one.
Beyond affecting the pot, cracked flaunching lets water track down inside the top of the stack, sometimes finding its way into the flue or down between the pot and the surrounding brickwork, which can contribute to damp problems that seem to originate from the chimney breast lower down in the house, well away from the actual defect causing the trouble in the first place. A flaunching repair carried out in isolation, without checking the pot and surrounding brickwork, can sometimes miss a related problem that's contributing to the same symptoms noticed by the homeowner below.
Repairing flaunching involves removing the old, cracked mortar fillet entirely, resetting the pot if it's still in good condition, and applying a new flaunching shaped correctly to shed water outward rather than allowing it to pool. Getting the slope and finish right matters — a poorly formed flaunching can fail again within a few years, while a properly finished one should last for a good many years even in Henbury's exposed weather conditions throughout the seasons.
This is typically a job carried out alongside other chimney maintenance, since a roofer accessing the top of the stack to deal with flaunching is well placed to check pots, pointing, and flashing at the same time, rather than requiring separate access visits for each individual repair identified during the inspection. It's generally recommended to have flaunching checked at the same time as any other chimney work, given how quickly a small crack here can progress into a genuinely loose pot within a single wet winter.
If you've noticed a loose or leaning pot, or suspect the flaunching on your Henbury chimney has cracked, Brunel Roofing Bristol offers free inspections and can put it right as part of a wider chimney check if needed.
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