Roof cleaning across Knowsley Village
Moss removal here is hand scraping and biocide, never pressure on the tiles, so the roof covering stays sound while the growth dies off.
The village is wrapped by the parkland of Knowsley Hall, with the estate wall, coppices and mature trees pressing right up against the houses on the western side and the open green at its heart. All that shelter and shade holds moisture in the damp Mersey-basin air, and leaf drop off the park trees feeds the gutters and joints, so moss and algae get going again quicker here than on open streets with no tree cover. North-facing roofs and render near the park edge stay wet longest and green up first.
