Older roof tiles need a genuinely different approach to cleaning than modern ones do, and this is a particularly relevant question for homeowners in Westbury-on-Trym, where a good number of properties still carry their original clay or concrete tiles from many decades past, some of them fitted long before current building standards existed.
The biggest risk with older tiles is aggressive high-pressure jet washing. It might strip moss off quickly and look impressive in the moment, but the sheer force of the water can crack brittle tiles, dislodge them entirely from their fixings, or strip away the tile's outer protective surface, leaving it more porous and consequently more vulnerable to future moss growth rather than genuinely less.
That's precisely why we use a gentle soft-wash and biocide treatment rather than blasting a roof with high pressure from below. The moss, lichen and algae are treated and washed away using much lower pressure throughout, which is far more forgiving on tiles that have already had decades of weathering, frost and general wear and tear to contend with over their working life.
This slower, more careful method naturally takes longer than a quick pressure-wash would, but it's a trade-off that's genuinely worth making on the kind of established roofs common across Westbury-on-Trym. A tile that cracks under high pressure isn't a saving of any kind, it's a repair bill that could easily have been avoided altogether with the right approach from the outset.
Before any cleaning work starts, we assess the roof carefully to understand its condition and exactly what it can safely handle. Some older tiles are considerably more fragile than others depending on the original material used, how they were fitted at the time, and how they've weathered over the intervening years, and that initial assessment shapes exactly how the work is carried out from start to finish.
It's also worth having someone with genuine roofing knowledge doing the work rather than a general exterior cleaning service with no background in roofs at all. A roofer knows what a deteriorating tile or a failing mortar joint actually looks like and can spot it during the clean itself, whereas a cleaning-only operator is simply focused on getting the moss off as quickly as possible and moving on to the next job.
Cleaning older tiles properly isn't purely about appearance either, though that's usually what prompts the call in the first place. Removing built-up moss reduces the amount of moisture sitting against the tile surface day after day, which can genuinely help slow the kind of gradual deterioration that persistent damp tends to encourage over time on any roof.
If you've got an older tiled roof in Westbury-on-Trym and want it cleaned properly rather than risked with high pressure and guesswork, get in touch with Brunel Roofing Bristol and we'll talk you through the right approach for your specific property. It's also worth asking any contractor directly what method they plan to use before booking work, since the difference between a gentle soft-wash and an aggressive pressure clean can be the difference between a roof that lasts many more years and one that needs premature, and entirely avoidable, repair sooner than it should have done.
Get a Free Quote for Roof Cleaning in Westbury-on-Trym
Every roof is different — the fastest way to get an accurate answer is a quick chat with our team.