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Walls

Render Soft Washing

Render goes green and black for the same reason a roof does: algae in the damp. A soft wash kills it at low pressure, so the render's surface and paint aren't blasted off. It's usually priced with the roof.

Why render goes green, how it's cleaned, and what to ask.

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Before and after

Real jobs in Co. Meath, shared by the Irish company that did them.

Before: the slate roof of a church in Co. Meath, before and after the moss was removed — Church slate roof, Co. Meath: moss lifted, soft washed and treated.

After: the slate roof of a church in Co. Meath, before and after the moss was removed — Church slate roof, Co. Meath: moss lifted, soft washed and treated.

Before: a tiled roof with solar panels in Co. Meath, before and after cleaning — Concrete tile roof with solar panels, Co. Meath: algae and moss off, panels kept clear.

After: a tiled roof with solar panels in Co. Meath, before and after cleaning — Concrete tile roof with solar panels, Co. Meath: algae and moss off, panels kept clear.

Before: a slate roof in Co. Meath, before and after the moss was removed by hand — Slate roof, Co. Meath: thick moss scraped off by hand, then washed and treated.

After: a slate roof in Co. Meath, before and after the moss was removed by hand — Slate roof, Co. Meath: thick moss scraped off by hand, then washed and treated.

Before: the rendered front of a house in Co. Meath, before and after a soft wash — Rendered front of a house, Co. Meath: green and black streaks soft washed off at low pressure.

After: the rendered front of a house in Co. Meath, before and after a soft wash — Rendered front of a house, Co. Meath: green and black streaks soft washed off at low pressure.

Before: a rendered outbuilding wall in Co. Meath with rust stains, before and after cleaning — Rendered outbuilding, Co. Meath: rust stains lifted without blasting the render.

After: a rendered outbuilding wall in Co. Meath with rust stains, before and after cleaning — Rendered outbuilding, Co. Meath: rust stains lifted without blasting the render.

Why walls go green

North-facing walls, walls under trees and the strip under a leaking or overflowing gutter stay damp, and algae grows on them. Rust-coloured runs come from iron in the render, old fixings or the run-off from a metal roof. A soft wash, a biocide at low pressure, kills the growth and lifts the staining; the wall keeps clearing in the rain after.

Low pressure only: high pressure scars render and lifts paint.
Windows, doors and plants covered first.
The gutter above checked: if it's overflowing, the wall goes green again.
Rust stains get their own treatment, not just the biocide.

Cleaning jobs we cover

The slate roof of a church in Co. Meath after a soft wash

Soft wash roof cleaningLow pressure and a biocide. €300 to €1,800 on a 3-bed semi.More on soft wash roof cleaning →

Moss being scraped off a roof with a long pole, Co. Meath

Roof moss removalThick moss off by hand, then washed and treated. €350 to €750 for a small job.More on roof moss removal →

Drawing of a gutter and downpipe at the eaves

Roof and gutter cleaningWhere the moss ends up. €80 to €200 on their own.More on roof and gutter cleaning →

A slate roof after the moss was removed, Co. Meath

Moss treatmentKeep it clean longer. €150 to €400 added to a clean.More on moss treatment →

A concrete tile roof with solar panels after cleaning, Co. Meath

Slate and solar roofsTiles, natural slate and roofs with panels: what's safe.More on slate and solar roofs →

Soft wash roof cleaning in every county

Questions people ask

Can render be pressure washed?

Not safely. High pressure scars the surface and lifts paint. A soft wash at low pressure is the way.

How long does clean render stay clean?

Years on a sunny wall; less on a north-facing one or under trees. A biocide after the wash buys time.

Can the roof and walls be done together?

Yes, and it usually costs less than two visits. Pick Roof and walls in the form.

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