Chimneys are a defining feature of St Pauls' Victorian and Edwardian rooflines, and they are also one of the most common sources of leaks on older properties in the area. Whenever we clean a roof here, checking the chimney and its surrounding flashing is a standard part of the process, not an optional extra.
The flashing around a chimney, the metal or lead strip that seals the junction between the stack and the roof tiles, is under constant stress from thermal movement, weather, and age. On many St Pauls properties this flashing is original or has been replaced only once or twice over the building's lifetime, and it is exactly the kind of detail that can deteriorate quietly for years without being noticed from ground level.
Moss and general debris tend to collect right at the base of chimneys, where the roof pitch meets the vertical stack, since this is a natural low point for material to gather. Left in place, this build-up sits directly against the flashing, trapping moisture and making it very difficult to see whether the flashing underneath is still fully sealed or has begun to lift, crack, or corrode.
Redundant or capped chimneys, common on St Pauls properties where an open fireplace has since been removed internally, still need the same level of attention to their flashing as an active chimney, since the roof junction itself does not change even if the chimney is no longer in use. It is easy to assume a capped chimney needs less care, but from a roofing perspective the flashing around it is just as important to keep watertight.
Clearing this area during a proper roof clean gives us a genuine opportunity to look closely at the chimney flashing, something that is simply not possible while it is covered in moss and trapped debris. On period properties like those common across St Pauls, this kind of close inspection is often overdue by the time a roof finally gets cleaned.
Chimney stacks themselves are also worth a visual check while we are up there, since mortar pointing between chimney bricks can weather and crack over time in much the same way as roof ridge mortar, and a chimney in poor repair can itself become a source of water ingress into the roof space below.
This is really part of the wider case for having a proper roofing contractor carry out roof cleaning rather than a general exterior cleaning service. Checking flashing and chimney condition alongside the clean itself means the visit delivers more than a cosmetic improvement, it gives a fuller picture of the roof's overall health.
Where a St Pauls property has more than one chimney, which is common on larger period terraces, each stack is checked individually rather than assuming they are all in the same condition, since one stack may have been repointed or repaired more recently than another, and their flashing can age quite differently as a result. We also look at how the chimney has weathered relative to the rest of the roof, since a stack standing taller and more exposed than the surrounding tiles tends to bear the brunt of wind-driven rain, and its flashing can wear noticeably faster as a result on many St Pauls terraces.
If your St Pauls property has a chimney that has not been checked in some time, having the roof professionally cleaned is a sensible way to get a proper look at it. Contact Brunel Roofing Bristol to arrange an assessment.
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