Concrete tile roofs are the most common in SEQ and the most susceptible to biological growth. Soft washing kills mould, algae and lichen at the root — safely and without damaging your tiles.
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Concrete roof tiles are the most widely installed roofing material in South East Queensland. They're durable, cost-effective and perform well in Queensland's climate — but their porous surface makes them particularly susceptible to biological growth. Algae, moss and lichen establish readily on concrete tiles because the porous surface provides excellent grip and the calcium carbonate filler in the tile provides a food source for organisms like Gloeocapsa magma. Over time, biological growth can cause concrete tiles to lose their surface integrity, become more porous, and in severe cases develop micro-fractures that allow water ingress. Regular professional cleaning prevents this deterioration and maintains the performance and appearance of your concrete tile roof.
The porous surface of concrete tiles provides both grip and food for biological growth. Algae roots into the tile surface, lichen bonds to it with its root-like rhizines, and moss establishes across shaded sections. Queensland's humidity and frequent rainfall mean the tile surface stays moist enough to support rapid growth, particularly on shaded north or south-facing roof sections.
High-pressure washing on concrete tiles strips the surface layer of the tile, removing the top coating and making the tile surface more porous — actually accelerating future biological growth. The granules that make up the tile surface are physically blasted away, and in the process ridge capping mortar can also be damaged. Soft washing achieves superior results without any of this surface damage.
Soft wash results on concrete tiles typically last 12 to 24 months. The biocidal solution continues to inhibit regrowth for some time after the clean. Properties in heavily shaded positions or close to trees or water may need annual attention; open, sun-exposed roofs can typically go 18 to 24 months.
Heavily soiled concrete tiles can look dramatically different after a professional clean — original tile colour is often restored to a significantly brighter result than homeowners expect. The transformation is one of the most striking results in exterior cleaning.
Every 12 to 24 months is typical for most SEQ positions. Properties in shaded, coastal or heavily tree-lined positions may benefit from annual cleaning.
Yes — significantly. Soft washing kills biological growth at the root and doesn't damage the tile surface. Pressure washing strips the tile surface, makes it more porous, and results in faster biological regrowth.
Yes, in most cases. Much of what appears to be fading on concrete tiles is actually biological growth and surface grime. A thorough soft wash often restores the original tile colour dramatically.
Starts from $799 for a standard single-storey home, including free gutter clean and free solar panel clean (up to 20 panels). Free quote before any work starts.
Serving Redlands and all of South East Queensland. We reply within 2 hours, Mon–Sat.
0412 291 614