The honest answer isn't a single number — it depends on your roof type, your location, shade levels and whether you've had soft washing or pressure washing done before. Here's the full guide.
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The most common recommendation in the cleaning industry is to clean your roof every 1 to 3 years, but this range is too broad to be genuinely useful. The right frequency for your property depends on specific factors — and getting it right means you're not cleaning too often (wasting money) or too infrequently (allowing growth to establish deeply and become harder to remove). For most Queensland properties, a soft-washed roof should be cleaned every 12 to 24 months. Properties with favourable conditions can go toward the longer end; properties with multiple risk factors should clean more frequently.
Your roof needs more frequent attention if: it has significant shade coverage from trees or adjacent buildings (shaded sections stay moist longer and accumulate growth faster); your property is in a coastal position within a few kilometres of the water (salt air and humidity accelerate growth); your roof has a lower pitch or flat sections that hold moisture; you're in a high-rainfall area (Toowoomba, South Burnett, Sunshine Coast hinterland); or your roof was previously pressure washed (surfaces are more porous after pressure washing and accumulate growth faster).
Your roof can typically go longer between cleans if: it's mostly north-facing and receives strong sunlight throughout the day (UV inhibits growth); your property is in an open position with good airflow; there's minimal tree coverage; your roof is colorbond or newer terracotta (less porous than concrete tiles); and it was previously soft washed rather than pressure washed (less porous surface).
Rather than booking on a rigid schedule, the most practical approach is to inspect your roof twice a year — from ground level is fine in most cases — and book a clean when you see the first signs of biological growth returning. Early-stage growth is significantly easier to remove than established colonies, typically requires less chemical treatment and the results last longer after the clean.
Annual cleaning makes sense for: properties in coastal positions close to the water; heavily shaded roofs; properties in high-rainfall areas with significant tree coverage; and investment or rental properties where appearance needs to be maintained consistently.
For most SEQ properties, every 12 to 24 months is appropriate with soft washing. Coastal, shaded and high-rainfall properties tend toward annual cleaning; open, sun-exposed properties can go 18 to 24 months.
If you've been pressure washing, your roof surface is more porous (pressure washing strips the tile surface) and biological growth re-establishes faster. Switching to soft washing will give you longer results. You may find that after the first soft wash the interval between cleans extends.
Roofs can be cleaned year-round in SEQ. Many homeowners book before summer (October-November) to address growth that accumulated through the cooler months, and before the peak storm season. Pre-sale cleans are typically booked 2 to 4 weeks before photography.
We don't recommend cleaning a soft-washed roof within 12 months of the previous clean — the biocidal solution remains active for some time and early regrowth will typically resolve on its own. If you're seeing growth before 12 months, there may be a specific environmental factor worth investigating.
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