Lakeside properties get a particular problem: high humidity off the water combined with heavy tree cover means mould and lichen establish faster here than almost anywhere else in the region. South facing walls in Warners Bay and Eleebana can regrow within a year if the treatment only removed the surface layer.
Roofs around the lake are the most common call. Concrete tile roofs under gum cover collect leaf litter, which holds moisture and feeds lichen, and that combination is what eventually lifts and cracks tiles.