Algae, black streaking and weather staining can make a sound render look decades older than it is. We bring it back to its original colour.
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Modern renders such as monocouche and silicone are designed to stay clean, but on shaded, damp or north-facing walls they still pick up algae, lichen and dark run-off stains. Traditional sand and cement render picks it up even faster.
Pressure-washing render the wrong way can strip the surface texture, blow out the colour and leave patchy marks. We use low-pressure, high-temperature cleaning and suitable biocide treatments matched to the render type, so the finish is cleaned rather than damaged.
The result is a facade that looks freshly rendered for a fraction of the cost and disruption of re-rendering or painting.
Tell us about the job and we'll come back to you fast. No obligation.
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Real footage from our jobs. Superheated steam at low pressure lifts decades of black staining and organic growth, while the stone and its carved detail stay intact.
The Park Hotel, Morecambe · Thermatech steam
Black staining lifted from sandstone, no chemicals
Watch our restoration work at the Park Hotel, Morecambe
Most buildings need more than one technique. We'll recommend the right combination.
Our main service. Black carbon, soot and pollution staining lifted with Thermatech superheated steam, with no chemicals. Safe for heritage and listed buildings.
Learn more →Remove paint, rust, graffiti and grime from brick, stone, concrete and metal, back to a clean, sound surface.
Learn more →High-pressure cleaning for driveways, patios, car parks and hard surfaces. Fast, thorough and long-lasting.
Learn more →Strip unwanted paint and coatings from brick and stone without damaging the substrate. Reveal the original stonework.
Learn more →A careful, conservation-led approach for listed and heritage buildings, protecting the character of your property.
Learn more →Homeowners, property managers and owners of listed buildings.
“Absolutely transformed our sandstone farmhouse. The render was black and we'd given up hope. Spartan brought it back to life in one day. Couldn't be happier.”
“Used them to clean the render and repoint our listed building. Professional from start to finish. The conservation officer was happy too, which says it all.”
“The driveway looks brand new. They were on time, tidy, and the price was fair. Will definitely use again for the back of the house.”
Yes. Tell us about the job and we'll arrange a free site survey and give you a detailed written quote, with no obligation to go ahead.
It depends on the material. Harder surfaces and metalwork suit sandblasting well, but softer and historic stone often doesn't. We test first and, where it's the better option, recommend a gentler method such as Thermatech steam cleaning.
Yes. We follow conservation guidelines and use the gentlest method that gets the result. Listed buildings often need listed building consent before exterior cleaning, so we'll explain our proposed method so you can discuss it with your conservation officer first.
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