Sandstone Patio Cleaning and Repointing in Princes Risborough
Indian sandstone patio cleaning in Princes Risborough: black spot and algae treated, back steps relaid and repointed, protected with Chiltern EverGuard™.
EXPERT CARE. LASTING RESULTS.
Before · The main patio
Before · The seating area
Sandstone Patio Cleaning and Repointing
Cholesbury, Buckinghamshire
Black spot and lichen treated within the stone, all of the old jointing taken out, and the whole patio repointed.
Chiltern Surface Cochilternsurface.co.uk
EXPERT CARE. LASTING RESULTS.
The Problem
Black Spot, Lichen and Failed Joints
Location
Cholesbury, Buckinghamshire
Surface
Sandstone patio
Visits
Two: the clean, then the repoint
The sandstone had gone a flat grey, and much of the jointing had failed.
Black spot lichen, green algae and soiling had taken the colour out of the stone across the whole patio. Underneath it, joints were cracked, loose or missing, with weeds growing through them. Open joints let water into the bedding below and give growth a foothold, so the patio needed more than a clean.
Our Process
Cleaned, Then Repointed
01
The Clean
First visit · 12 October
Every area of sandstone was deep cleaned, with sandstone-safe treatments for the black spot, lichen and rust staining, given the time they need to work rather than more pressure. Loose and failed jointing was extracted as the stone was cleaned, and the visit finished with Chiltern EverGuard™.
02
The Repoint
Second visit · 29 October
With the stone clean, the state of the joints was plain to see. All of the old jointing came out and the joints were cleaned out to depth. Two coats of an invisible pre-grout sealer protected the face of the stone, then the whole patio was repointed with a resin-based jointing compound that sets to a durable, semi-flexible joint.
Chiltern EverGuard™ A system with a biocide at its heart. It penetrates the pores of the stone, kills the growth living inside it and inhibits regrowth, typically for two to three years, depending on the surface and its environment.
Chiltern Surface Co02
After · The main patio
The Results
The Colour Back in the Stone
Under the grey was a warm, multi-coloured sandstone. Cleaned, treated and fully repointed, the patio reads as one finished surface again, from the house to the garden, with a clean, even joint around every slab.
Chiltern Surface Co03
After · The side terrace
Chiltern Surface Co · Buckinghamshire
Sandstone Patio Cleaning in
Cholesbury, Buckinghamshire
Chiltern Surface Co carried out this sandstone patio cleaning and repointing in Cholesbury, Buckinghamshire, close to our patio cleaning in Chesham and Great Missenden. We also offer patio cleaning, driveway cleaning, roof cleaning and roof moss removal across Oxfordshire and Berkshire, including Thame, Henley-on-Thames, Maidenhead and Windsor.
Black spot lives in the pores of sandstone, and a patio is only as sound as its joints. That is why a lasting result is a staged process — controlled cleaning, targeted treatment, protection with Chiltern EverGuard™ and, where the joints have failed, a full repoint — rather than a single pass with a pressure washer.
Chiltern Surface Co · Cholesbury, BuckinghamshireExpert Care. Lasting Results.
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Advice
Patio cleaning advice
Patios
How to Clean a Sandstone Patio
Clean sandstone safely with a surface-specific method that removes dirt, algae, moss, and black spot without scarring the stone or damaging the joints.
Patios & Natural Stone
Black Spot on Sandstone
Black spot looks like dirt, which is precisely why it is so often treated like dirt. The trouble is that established lichen on porous sandstone is a biological problem, not simply a dirty surface.
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Why Is My Patio Slippery in Winter?
A green or slippery patio is a common winter problem. Learn why it happens, which paving materials need care and how to reduce slip risk without damaging the surface.
Chiltern Surface Co
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Surface-specific recommendations
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