Case Study: Replacing a Leaking Boiler Flue and Roof Lead – Willaston

This project came to Prof Heat Services from a homeowner in Willaston whose boiler flue had developed a leak at roof level. Over time, the old flue terminal and surrounding lead flashing had failed, allowing water to get in around the roof penetration. The job involved removing the old flue and lead completely and fitting a new flue terminal and lead flashing correctly to current regulations.

The Brief

The existing flue terminal and lead flashing around it had deteriorated, leaving the roof penetration vulnerable to water ingress. The brief was straightforward: remove the old flue and failed lead, fit a new flue terminal with the correct roof collar, and replace the lead flashing to create a fully weathertight seal – all completed to current Gas Safe regulations.

Before the Work Started

The old flue terminal showed clear signs of failure, with sealant breaking down around the joints and the surrounding lead flashing no longer providing a reliable seal. This had allowed water to track down around the flue and into the roof space below – exactly the kind of issue that needs addressing before it causes more serious damage.

Removing the Old Flue and Preparing New Components

With the old flue terminal removed, the roof opening was exposed and the new components laid out ready for fitting. New lead flashing was cut and shaped to match the roof profile, ensuring the new flue terminal would sit correctly and seal properly against the surrounding tiles.

The Finished Installation

The new flue terminal was fitted with a proper roof collar and sealed with new lead flashing dressed correctly around the base. This gives a clean, fully weathertight finish that will prevent any further water ingress and ensures the flue terminates safely and in compliance with current regulations.

The finished job leaves the flue terminal sitting cleanly on the roofline, with the new lead flashing tucked correctly under the surrounding tiles for a discreet, durable seal. The homeowner now has peace of mind that the roof penetration is fully weathertight and the flue is installed to current standards.

What This Project Involved

• Removal of an old, leaking boiler flue terminal
• Removal of failed lead flashing around the roof penetration
• Installation of a new flue terminal with correct roof collar
• New lead flashing dressed and fitted to current Gas Safe regulations
• Fully weathertight seal to prevent further water ingress

Noticed a Leak Around Your Boiler Flue in Willaston or Nantwich?

A leaking flue or failed roof flashing should be dealt with promptly to avoid further damage. Prof Heat Services provides flue repairs and replacements across Willaston, Nantwich, Crewe and the surrounding Cheshire area. If you have noticed staining, damp or a leak near your boiler flue, get in touch for an honest assessment and quote.

All gas work carried out by Prof Heat Services is completed by a Gas Safe registered engineer (licence number 649322) with twenty years of experience working across Cheshire.

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