Ledbury roofs, specifically
Why Ledbury roofs green up faster, tucked under the Malverns.
Ledbury sits low on the River Leadon — the river it most likely takes its name from — in a sheltered pocket beneath the western scarp of the Malvern Hills. It's a lovely place to live and a hard place to keep a roof clean. The Malverns block the eastern weather and shelter the town, which sounds like a good thing until you realise what shelter does to damp air: it sits still. Slow-moving, humid air over a low valley floor is exactly what moss, lichen and gloeocapsa algae feed on, and the eastern edge of the parish actually falls inside the Malvern Hills AONB, where the wooded, north-facing slopes barely dry out from October through to spring.
You see it most starkly in the old town. Church Lane — the cobbled, much-photographed climb up to the parish church, lined with leaning black-and-white timber-framed houses — and the High Street below it are packed with tall heritage properties standing close together. They shade each other for most of the day, the lanes are narrow enough that very little direct sun reaches the lower pitches, and the original clay, stone and hand-made tile holds damp far longer than modern materials. By the time someone calls us, a roof above the High Street is usually a thick mat of moss sitting in the laps, with rust weeping off old lead and valley metal.
Out on the new estates it's a different roof but the same problem. The recent HR8 developments — Hopfields off Leadon Way, Bloor Homes' The Arches up towards the viaduct, and the homes around Mabel's Furlong and the viaduct site — are mostly modern concrete interlocking tile. Those tiles are textured, which gives spores something to grip, so even in this sheltered air a roof only a few years old can already carry a green wash on its north-facing pitch. Whether it's a fifteenth-century cottage on Church Lane or a brand-new house at The Arches, the cause is the same Leadon-valley damp, and so is the fix.
One thing that's specific to Ledbury is the surrounding land. This is orchard and hop country — the town's history is bound up with cider, perry and hops, and there are vineyards and woods on every side. All that vegetation is a steady source of airborne spores, drifting onto roofs across the parish and the villages around it. It's also why we don't believe in pressure-blasting tile that's already weathered: the surface coating thins with age, and hammering it with high pressure takes years off the tile to buy you one clean season. Lifting the moss off by hand and then treating with biocide is gentler on the tile and lasts far longer — which matters whether the roof is centuries old or barely run-in.