Roof cleaning across Childwall
We lift the moss softly rather than blasting the tile, then treat the whole roof so the growth under this tree cover dies off rather than seeding straight back.
Childwall stands on a sandstone rise on the south-east side of Liverpool, with Childwall Woods and Fields pressing a band of mature woodland right up against the houses. The avenues were planted with trees when they were laid out between the wars, and those trees now keep roofs, drives and gable walls in shade for a good part of the day. Add the damp air that hangs over the Mersey basin and you have moss, green algae and black spot that return season after season unless the surface is properly treated as well as cleaned.
