Can You Pressure Wash a Fence? Timber, Colorbond and Rendered Fences

Yes, you can pressure wash a fence, but the pressure has to suit the material. Timber fences need a gentle, controlled clean so the grain is not furred or gouged. Colorbond and other steel fences need low pressure so the coating is not scratched or stripped. Rendered and painted masonry fences are soft washed, with a cleaning solution doing most of the work. One high-pressure setting for every fence is how most fence damage happens.

This guide covers how each common Sydney fence type should be cleaned, what to watch for before you start, and when it is worth booking a professional.

Timber fences: paling, treated pine and hardwood

Timber is the fence most easily damaged by a pressure washer. Push too much pressure into the boards and the soft fibres between the growth rings get torn out, leaving a rough, fuzzy surface that will not go smooth again on its own. Hold the nozzle too close or in one spot and you get gouges and stripes that show clearly once the fence dries.

A proper timber fence clean uses low pressure, a wide spray, and a cleaning solution that lifts the grey weathering, mould and black spotting so the water does not have to blast it off. The aim is an even colour along the whole run, not a few bright patches.

• Check for rot first. Soft palings, rotted rails and loose posts get worse with water, so they should be flagged before any cleaning.
• Work along the grain and keep the spray moving, on both faces if you can reach the neighbour's side.
• Let the timber dry fully, usually a few dry days, before any oil, stain or paint goes on.
• Older palings with a lot of weathering can lighten a lot. That is normal, and it is the clean timber showing through.

The same principle applies to decks, which we cover in detail in can you pressure wash a timber deck.

Colorbond and steel fences

Colorbond fences look tough, but the colour is a factory-applied paint finish on steel. High pressure, a narrow nozzle or a harsh brush can scratch or wear that finish, and damage along the edges and fixings exposes the steel underneath. Dirt, cobwebs, mould on the shaded side and a chalky film all build up over time and dull the colour.

Colorbond is washed at low pressure with a suitable cleaning solution and rinsed thoroughly, top to bottom. Close to the coast, salt film builds up faster and is worth rinsing off more often, because salt held against metal is never good for it. If a Colorbond fence has been tagged, graffiti needs its own removal method rather than a harder blast, see our graffiti removal page.

Rendered, painted and brick fences

Rendered and painted masonry fences are cleaned the same way as house walls: a soft wash at low pressure, with a solution that kills mould and lifts the black streaking common on shaded, south-facing sides. High pressure on old or chalky paint can strip it in patches. Plain face brick and concrete block can take a firmer clean, but the mortar joints still need care.

What a fence clean will not fix

Cleaning removes dirt, mould and weathering. It will not repair rotten timber, rust that has already come through on steel, or paint that is already peeling. On peeling paint, washing can make the flaking more obvious. If a fence has those problems, cleaning is still a good first step, but it will not be the last one.

We clean only. We do not oil, stain, paint or seal fences, so if you want a timber fence recoated after cleaning, that is a job for you or a painter once the timber is dry.

DIY or hire a professional?

A short run of Colorbond with light dirt is a reasonable DIY job with a domestic pressure washer on a low setting, a wide fan nozzle and a gentle cleaner. Timber is where most DIY attempts go wrong, because the damage is permanent. It is worth calling a professional when:

• The fence is long, tall or runs along a steep or bush-edge block.
• The timber is old, heavily weathered or has a failing finish.
• There is heavy mould on the shaded side, or the neighbour's side needs doing too.
• You want the fence, house and paths done together in one visit.

What fence cleaning costs

Fence cleaning is priced on the length and height of the fence, the material, how much growth is on it and how easy it is to reach both sides. Small jobs start from around $150, and longer or taller fences cost more. Every job gets a free, fixed quote after a quick look or a few clear photos, so you know the price before any work starts.

Fence cleaning across our service area

AW Pressure Washing cleans timber, Colorbond and rendered fences across the North Shore, Northern Beaches and Eastern Suburbs. Shade and leaf litter drive mould on fences in leafy, bush-edge suburbs such as Killarney Heights and Elanora Heights, while salt air builds up film on metal fences closer to the coast. See the fence and deck cleaning page for what is included, then text 0410 612 666 or request a free quote.

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