Green mould on exterior walls is algae that's rooted into your cladding. Wiping or pressure washing it off leaves the roots behind — it grows back within months. Soft washing kills it permanently.
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Green mould on the exterior walls of your home is one of the most common property issues in South East Queensland's humid, subtropical climate. What looks like surface-level green or dark staining is actually living algae that has rooted itself into your cladding — whether that's render, brick, weatherboard, colorbond or fibre cement. Left untreated, algae traps moisture against your cladding, accelerates paint deterioration and can penetrate porous surfaces like render and brick, causing structural damage over time. Burnett 2 Bay Soft Wash removes green mould from house exteriors across Redlands, the Gold Coast, Ipswich, Logan, Toowoomba, the Sunshine Coast and all of SEQ — safely and without damaging your cladding.
Queensland's climate is near-perfect for algae growth — high humidity, warm temperatures and frequent rainfall create ideal conditions. Shaded walls, south-facing aspects and properties near trees or water build up organic growth faster than sun-exposed surfaces. Salt air in coastal areas like Redlands and the Gold Coast also accelerates growth by trapping moisture against exterior surfaces.
Green mould isn't just cosmetic. Algae roots into porous surfaces like render, brick and painted weatherboard, creating micro-fractures that allow water ingress. Moisture trapped beneath the growth accelerates paint failure and can compromise the waterproofing integrity of your cladding over time. Regular cleaning protects your cladding and extends the life of your paint system.
Our soft wash method is specifically safe for render, brick, weatherboard, colorbond, fibre cement and timber — the full range of exterior cladding found on QLD homes. We adjust the chemical concentration and pressure to match your specific surface, never a one-size-fits-all approach.
Soft wash results typically last 12 to 24 months depending on your property's aspect, tree coverage and proximity to water or the coast. Properties in heavily shaded or coastal positions may benefit from cleaning every 12 months; open, sun-exposed positions typically go 18 to 24 months before significant regrowth appears.
The mould and algae that grows on exterior walls is primarily a structural risk rather than a direct health hazard — it damages cladding, accelerates paint failure and allows moisture penetration over time. However, some mould types that establish indoors can have health implications. Keeping exterior surfaces clean prevents the growth from establishing indoors.
With soft washing, regrowth is typically 12 to 24 months. With pressure washing alone it returns within 3 to 6 months because the root system isn't killed. Soft washing kills the growth at root level, which is why results last significantly longer.
Yes. Soft washing is specifically the correct method for rendered houses. High-pressure washing on new or older render can lift the surface coat and cause cracking. Our low-pressure method cleans the render without any surface damage risk.
House washing starts from $499 for a standard property, including a free gutter clean. Final price depends on the size of your home and the extent of growth. Free quote provided before any work starts.
Serving Redlands and all of South East Queensland. We reply within 2 hours, Mon–Sat.
0412 291 614