How to get moss and algae off block paving

The most effective way to remove moss and algae from block paving is a professional water-only pressure wash that lifts the growth out of the joints as well as off the surface. Light growth can be tackled yourself, but heavy, established moss almost always needs proper equipment to shift it fully.

Why block paving goes green

Block paving traps moisture, dirt and organic matter down in the joints between the blocks. In shaded, damp or north-facing spots that's the perfect home for moss, weeds and green algae. Over a few seasons it spreads, dulls the colour and makes the surface slippery underfoot.

Doing it yourself

For a light film you can make progress with a stiff brush, a patio-safe cleaner and plenty of elbow grease, or a domestic pressure washer used carefully. Keep the pressure moderate and the nozzle moving - sitting too close or too hard in one spot can scar the blocks and blast out the jointing.

The professional approach

We clean with water alone at a pressure matched to the blocks, working the moss, weeds and algae out of the joints as well as off the tops. No harsh chemicals, so it's safe for your plants, pets and children. The result is an even, deep clean that brings the original colour and pattern back, rather than a patchy surface rinse.

Will it come back?

Nothing keeps moss away forever, but a thorough clean that clears the roots from the joints makes a big difference for a long time. Keeping the surface swept and clear of leaves, and improving drainage or light where you can, all slow the regrowth.