We remove moss, lichen and algae using a low-pressure carbon pole system — not a pressure washer. Followed by professional biocide treatment to inhibit regrowth. Safe for every tile type. Trusted by 41 homeowners and commercial clients across Berkshire, Buckinghamshire and Surrey.
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Most roof cleaning companies use high-powered pressure washers. We don't. Aggressive pressure washing can dislodge pointing, crack tiles, and force water beneath the tile bed — causing far more damage than the moss it was removing. Glanville uses a specialist approach that is thorough, safe, and built to last.
Our carbon fibre extension pole system fitted with specialist soft brushes allows our operatives to remove moss, lichen, and organic debris from your roof entirely by hand — without ladders resting against the tiles and without the destructive force of pressurised water.
Moss is lifted and cleared methodically, ridge to eave, working with the tile profile. Where a controlled rinse is required, water pressure is kept well below any threshold that causes tile or mortar damage.
Removing visible moss is only half the job. Without treatment, the microscopic spores and root systems left behind will regenerate — often faster than before. This is why most pressure-washed roofs look as bad within 18 months as they did before cleaning.
Following every roof clean, we apply a professional-grade DDAC-based biocide to the entire treated surface. This active chemistry kills algae, moss, lichen and organic growth at the root and inhibits regrowth over the months and years that follow.
High-pressure roof washing — still used by many exterior cleaning companies — can void your home insurance, accelerate tile wear, displace mortar from ridge and hip joints, and force water into roof spaces that were previously watertight. Our low-pressure carbon pole method delivers a cleaner, safer result that does not compromise the structural integrity of your roof. If a company quotes you for a roof clean and mentions a pressure washer, ask them what happens if tiles crack or pointing fails.
Find out more about our roof cleaning process →Every job we complete is documented with before and after photography. These are real properties — not stock images.
41 verified five-star reviews from homeowners and property managers across Berkshire, Buckinghamshire and Surrey.
"Glanville removed years of moss from our roof and treated it with a biocide solution. The process was explained clearly, the team was tidy, and the results were exactly as described. The drone inspection beforehand identified a ridge tile issue we weren't aware of. Highly recommended."
"We'd had quotes from three companies — two proposed pressure washing which I'd read could cause damage. Glanville were the only ones who properly explained the low-pressure method and biocide treatment. A year on, not a trace of growth has returned."
"Extremely professional from first contact to completion. Clear quote, arrived on time, left the property tidy, and sent through before and after photos the same day. Our roof looks better than it has in fifteen years. Would not hesitate to use again."
Glanville works with commercial property owners, hotel operators, managing agents and facilities managers across Berkshire and Surrey. Our commercial service operates to the same specialist standard as our residential work — with full documentation, COSHH data sheets, treatment records, and a capability statement for your compliance files.
We understand that commercial clients need a contractor who arrives on time, works safely around staff and occupants, provides proper paperwork, and does not need to be chased.
We work with:
Annual maintenance contracts available · All commercial projects quoted individually
We provide specialist roof cleaning and exterior cleaning services to homeowners and commercial property owners across Berkshire, Buckinghamshire and Surrey — including some of the most sought-after postcodes in the Home Counties.
Not sure if we cover your area? We work throughout Berkshire, Buckinghamshire and Surrey and regularly travel further for larger commercial projects. Call us on 07943 768996 or submit a survey request and we'll confirm availability.
Get a free, no-obligation roof survey from Berkshire's specialist roof cleaning company. We'll assess your roof, explain exactly what's needed, and provide a clear, fixed quote — no hidden charges, no pressure.