Roof Soft Washing

Yes. Soft washing uses low pressure and biodegradable cleaning agents that kill moss, mould and lichen at the root without damaging tiles, coatings, pointing or the ecosystem around your home.

Soft washing uses low pressure plus a cleaning solution to kill growth at the root. Pressure cleaning uses high-pressure water to blast growth off — which can crack tiles, strip coatings and lift pointing. Soft washing lasts longer and does no damage.

No. Low-pressure application and gentle rinsing do not lift, crack or dislodge tiles or pointing, unlike high-pressure cleaning.

No. Soft washing is safe on Colorbond — it uses low pressure and mild biodegradable products that don't strip the factory finish or void manufacturer warranties.

Yes — when done properly. Coast Flow uses eco-safe products and isolates downpipes to rainwater tanks during cleaning where required.

Biodegradable, roof-safe cleaning agents formulated to kill moss, mould, algae and lichen. We do not use raw chlorine bleach at strengths that damage roofs or tanks.

Yes. The products used are biodegradable and break down safely without contaminating gardens or waterways.

Most South Coast roofs stay clean for 2–5 years after a soft wash. Homes under heavy tree cover or on shady southern aspects may benefit from a top-up sooner.

Moss, mould, algae, lichen, atmospheric grime, sap staining and dark streaks from tile and metal roofs.

The biocide continues working for months, so regrowth is slow. Regrowth timing depends on tree cover, roof pitch and aspect.

No. That's a common risk with pressure cleaning — soft washing is specifically chosen to avoid it.

No. The low pressure and mild solutions do not strip factory Colorbond finishes or quality after-market roof coatings.

Yes. Products are diluted, biodegradable and applied so runoff is minimal. Garden beds are covered where necessary and pets are kept indoors during the wash.

No, provided we have safe access to the roof and a water tap. You'll receive the photo report by email.

A typical single-storey home takes half a day to a full day. Larger, two-storey or heavily soiled roofs take longer, quoted upfront.

Yes. Sensitive plants, ponds and pool areas are covered or protected before cleaning.

Yes, where required, we isolate downpipes feeding rainwater tanks so cleaning runoff does not enter the tank.

Yes. Moss and lichen hold moisture against tiles and coatings, accelerating wear. Regular soft washing extends the practical life of both tile and metal roofs.

No. Soft washing is the manufacturer-preferred method for cleaning both tile and Colorbond roofs — high-pressure cleaning is what typically voids warranties.

Spring and early autumn are ideal. Avoid extreme heat and heavy rain days for best product contact and results.

Yes. Both roof types are safely soft-washed using the same low-pressure method with product mixes tuned to the surface.

Yes — external walls, render, brick, timber decks and paths can be soft washed with product mixes tuned to each surface.

Yes. Coast Flow carries full public liability insurance for all rooftop work.

The biocide kills growth at the root. Dead growth then dries out and is washed off by subsequent rain over the following weeks — the roof continues to improve after we leave.

Any dislodged debris that ends up in the gutter is cleared. A full gutter clean can be booked at the same time — it's usually the most efficient combination.

There is a mild cleaning-product smell during application that dissipates quickly. Products are formulated to be low-odour.