The following photos show an Indian Sandstone patio of about 100 m2 in size at a property in Rushden. It had been some years since it had been cleaned and as you might expect the patio was now covered in green algae and staining. Also, much of the grout had become cracked or loose from the effects of frost and had broken down and needed replacing.

The beginning of the year is a perfect time to get a patio ready, the autumn leaves have fallen so there’s less debris causing stains, and of course you will be ready for the spring sunshine.

Cleaning an Indian Sandstone Patio

I started the renovation by digging out all the loose grout between the pavers. There isn’t really a quick way of doing this, so it’s just a question of getting down on my hands and knees and scraping it out.

I cleared up the debris and decanted a few litres of Tile Doctor Patio and Brick Driveway cleaner into a pump-up sprayer. This product is a powerful outdoor cleaning solution formulated to power through blackspots, lichen, moss, and stains. It’s a very strong product, so if you’re doing this yourself do wear protection. It was then sprayed onto all areas of the patio and left to soak in.

This is used as a pre-treatment to pressure washing and is best left to dwell on the surface for fifteen to thirty minutes depending on the severity of the soiling. The longer you leave it the more time it has to work on breaking down embedded soiling, green algae and lichen etc. A five-litre bottle can cover up to 25m2 so for a patio of this size you need around four bottles.

My next course of action was to set up the pressure washer so I could clean and rinse down the patio. I use a van mounted Briggs & Stratton petrol pressure washer for this which can generate pressures of up to 300 bar. This is much more powerful than general domestic electric machines and the high pressure of the machine also removes any loose grout I missed earlier.

The client had asked me to replace the missing grout, which was approximately half of the area. I was prepared for this and had sourced a wet mix grout of a similar colour to the original. This was mixed with water and brushed into the grout lines, then re brushed to leave a level finish.

Sealing a Sandstone Patio Tiled Floor

Allowing for the patio and grout to dry overnight, I returned the following day to brush over excess grout that had dried on the tiles before applying Tile Doctor Colour Grow sealer to help protect the patio from further staining and make it easier to clean going forward.

This product works by soaking into the stone, occupying the pores, and thereby preventing dirt from residing there, this keeps it on the surface where it can easily be rinsed away. Colour Grow also contains a colour enhancer that brings out the colour in the stone, something it does rather well on Sandstone which has a lot of natural character.

My client was very pleased with the transformation and left the following comment on our website:

Before leaving, I discussed our Tile Doctor Maintenance Plan which would mean we would return every year to maintain the patio. This would be a good investment each spring to keep the area looking good and ensure they could enjoy the outdoor entertainment area for longer.

Professional Restoration of an Indian Sandstone Patio in Northamptonshire