PHAM NEWS | JULY/AUGUST 2025 34 Stepby Step Guide to fi tting a Flue Snug


Robert Clarke, better known as Pointy Plumber on Instagram, has teamed up with ‘Grandad’ to explore the FlueSnug 5" fl ue seal from Talon Manufacturing. This game- changing tool simplifi es boiler fl ue replacements on fi nished brick exteriors, ensuring airtight, compliant seals without mess or lengthy processes. Here we provide a step by step picture tutorial on how the FS5 goes in.


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eplacing a boiler fl ue on a fi nished brick exterior has long been a job that heating engineers and installers approach with reluctance. From the painstaking work of lining up the


new fl ue with the old core drill hole, to the mess and delay of patching up with mortar or silicone, it’s often a job that takes more time than it should and is likely to


Assessing the existing fl ue hole The real


advantage of the FS5 lies in its dimensions. Designed to sit snugly in the existing 5" hole left by the original boiler fl ue, there’s no need for additional drilling or widening. The installer simply confi rms that the existing hole is intact and not misshapen – a quick check over is just minutes of prep work.


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Installing the FS5 With the hole prepared, the fl ue pipe is passed through the FlueSnug seal. The FS5 is then gently pushed into


the wall opening. The integrated fins on the FS5 help guide and grip the fi tting into place, ensuring a tight and stable fix. No adhesives, no screws, no mess. This is where the FS5 immediately saves time. In a traditional install, you’d now be reaching for mortar or silicone to seal around the fl ue – not with FlueSnug. The fit is engineered to be both airtight and watertight from the get-go.


make a real mess if not done with care. Built specifi cally to fi t standard 5-inch boiler fl ue


holes, the FS5 creates an airtight, Part L-compliant seal in seconds, without the need for additional sealant or cement. The result is a neat, secure fi nish that speeds up


installation and reduces thermal bridging — a key requirement under updated Building Regulations.


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Removing the fl ue for inspection or adjustment Should there be a need to inspect or reposition the fl ue, the FS5 is easily removed without damaging the surrounding brickwork. The installer simply pulls the FlueSnug out, leaving


the existing wall hole perfectly intact. This fl exibility is key in retrofi t situations or when boiler replacements don’t align perfectly with old fl ue angles. Unlike mortar or silicone,


which can degrade, crack or shrink over time, the FS5 offers a long-lasting seal that maintains its integrity. Traditional sealing methods are also highly dependent on workmanship; poor application can lead to gaps, air leakage and failed inspections under Part L. The FS5 eliminates


these risks. Manufactured to precise tolerances, it delivers a consistent result every time, regardless of the installer’s experience level. It’s also quicker — installation of the FS5 can shave 30 minutes or more off a typical fl ue job, not to mention drying time saved by skipping sealants.


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The fi nal result Once the fl ue and FS5 are reinstalled,


the result is both tidy and professional. No unsightly silicone beads, no cracked mortar repairs, just a fl ush seal that satisfi es both client and compliance offi cer alike. The integrated seal fi ts fl ush with the wall and around the fl ue, creating a consistent and high- quality look, particularly important when working in visible locations such as external brickwork.


And that’s it! By sealing the wall opening cleanly and eff ectively, it reduces heat loss through thermal bridging, which is a critical requirement of Part L of the Building Regulations. This alone can help installers ensure jobs are signed off faster and with fewer snags.


The FS5 is cost eff ective too. With no need for


additional consumables like silicone or mortar and fewer materials to clean up or dispose of, FlueSnug reduces labour and material costs on every job. ◼ phamnews.co.uk/725/66


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