Roof Cleaning Belfast

Diamond Property Maintenance NI provides professional roof cleaning across Belfast and Northern Ireland, working on concrete tiles, clay tiles, slate, flat roofs and metal roofing. We clean with a soft wash method rather than high pressure, because blasting a roof strips the protective surface off tiles, drives water under them and can crack older slate. Soft washing applies a low-pressure clean paired with a biocide treatment that kills moss, algae and lichen at the root, so it clears properly instead of growing straight back.

The process starts by removing the bulk moss, then applying the biocide that keeps working after we leave, continuing to break down remaining growth over the following weeks. We clear the gutters of the moss and debris that come down during the work, so your drainage is not left choked. Throughout, we inspect the roof for slipped, cracked or missing tiles and flag anything that needs a repair.

How much does roof cleaning cost in Belfast? Roof cleaning runs from £300 to £800, set by the size and pitch of the roof, the tile type and how heavy the moss and algae growth has become. A heavily overgrown roof needs more treatment and time than one with light surface algae, and the quote reflects the actual state of your roof.

Why do Belfast roofs grow so much moss? Our damp, mild climate is close to ideal for moss, algae and lichen, and north-facing and shaded roofs stay wet long enough for it to thrive. Left to build up, moss holds water against the tiles, blocks gutters as it sheds, lifts the edges of tiles and shortens the life of the roof. Clearing it protects the roof and the water flowing off it.

Roof work is height work, so safety is not optional. We are PASMA and IPAF certified, use reach equipment to clean from access platforms and minimise walking on the roof itself, and every job is covered by our £10M public liability insurance. With 30+ years on Northern Ireland roofs and a 5.0 rating across 45 Google reviews, the results typically stay clear for three to five years.