Roof Cleaning in West Harrow

Why West Harrow Roofs Collect So Much Moss

West Harrow is a quiet, leafy residential pocket straddling the HA1 and HA2 postcodes, bordered by Rayners Lane to the west and Harrow town centre to the east. The area is dominated by 1930s semi-detached and terraced housing, built during the rapid expansion of the Metropolitan Railway, and most of these properties still wear their original concrete tile roofs.

What makes West Harrow particularly prone to moss is the combination of mature street trees, relatively narrow plots that shade one side of the roof, and the typical NW London climate where rainfall is spread throughout the year. Moss does not need much to establish itself: a damp, shaded tile surface and a few airborne spores are enough. Once established, it spreads rapidly and can cover an entire roof slope within two or three years.

We clean roofs throughout West Harrow using methods suited to the tile type. For the concrete tiles that predominate here, we combine controlled pressure cleaning with a post-clean biocide application that prevents regrowth. The result is a roof that looks almost new and is protected against further moss damage.