Indian sandstone is one of the most popular patio materials in Redditch, but after a few Worcestershire winters it can start to look tired, with green algae in shaded corners and a dull, uneven finish. The good news is that most sandstone patios can be brought back to life without replacing a single slab, as long as you clean and reseal them properly.
Dealing With Algae and Staining
Green and black algae thrive in the damp, shaded spots that many Redditch gardens have, especially where fencing or hedges block the sun and airflow. A pressure washer will lift the surface growth, but going in too aggressively on sandstone can strip the surface and open up the pores, making it dirty again faster next time. It's better to use a lower pressure fan setting, work in the direction of the joints, and follow up with a proper sandstone-safe cleaning solution rather than relying on the washer alone.
Once the patio is clean, let it dry fully, which can take a couple of days in cooler, damper weather. Check the pointing between slabs at the same time, since cracked or crumbling joints let water track underneath the stone and are often the real reason algae keeps coming back year after year, even after a thorough clean.
Sealing to Keep It Looking Good
A breathable sandstone sealer, applied once the stone is completely dry, makes a real difference to how long a clean lasts. It reduces how much water and dirt soak into the surface, which slows algae growth and makes future cleaning much easier. Sealer needs reapplying every few years depending on footfall and exposure, so it's worth checking the condition annually rather than waiting until the patio looks bad again before doing anything about it.
If the patio is more than a few years old, it's also worth checking for lifted or rocking slabs while you're cleaning it. Freeze-thaw cycles over a Worcestershire winter can work water into small gaps in the jointing, and repeated expansion and contraction gradually loosens slabs that were otherwise fine. Catching this early and re-bedding a slab or two is a much smaller job than dealing with a wider area that's shifted after another winter of the same movement.
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