The Vale of Aylesbury’s clay lowland sits in a moisture-rich environment that promotes moss and lichen colonisation on north and east-facing roof pitches across the town. Properties in Bedgrove and Bierton Road with mature oak and ash trees overhead experience accelerated moss growth from year-round shade and organic debris loading. Properties on the Chiltern fringe — those in Wendover, Princes Risborough and Haddenham — face additional humidity from the escarpment and have some of the heaviest moss growth we see in the area.
Moss and lichen are not merely cosmetic. Accumulated moss acts as a water-retaining mat that holds moisture against mortar joints through freeze-thaw cycles, degrades the leading edges of clay and concrete tiles, lifts verge mortar, and causes valley blockages that lead to roof leaks. A roof heavily colonised with moss is ageing faster than a clean one.
Our cleaning process uses low-pressure soft wash rather than high-pressure jetting. High-pressure washing forces water behind tiles, damages mortar, and erodes the surface coating of concrete tiles — it is not a method we use. Soft wash biocide application kills moss and lichen at the root without damaging tiles or mortar. The dead growth then weathers off naturally over 3–6 months. A post-treatment protective biocide inhibits re-growth for 3–5 years.
What’s Included in a Roof Clean
Pre-clean roof inspection. Manual removal of heavy moss growth where required. Low-pressure biocide application to all roof surfaces. Valley clearance. Post-treatment protective coat. Written report on any tile or mortar issues identified. Optional annual maintenance plan.
Costs in Aylesbury
Standard 3-bed semi (Bedgrove or Elm Farm): £300–£500. Larger detached with more surface area: £450–£800. Heavily colonised Chiltern properties (Wendover/Princes Risborough): £400–£700. Annual maintenance treatment: £150–£250.
