Algae is a plant-like, photosynthetic organism that flourishes in any environment with moisture. Preferring damp conditions, algae is usually indicative of a larger problem going on. Although it usually manifests as patches of green, algae can also be red, brown and even blue.
While it may seem harmless on the surface, if left, it can actually go on to cause a lot of damage, especially to natural stone. The density of algae can suddenly increase with changes to the levels of sunlight or mineral availability.
Large patches of algae on pavements not only act as a slip hazard, but also decreases the traction of the material it’s growing on, further increasing the risks of slips. This is particularly risky in high footfall areas, especially on public footpaths.
While algae is unsightly, it can be far more damaging than you could imagine. Like lichen, algae releases acidic secretions which can go on to cause damage to natural stone, in particular, soft stone such as limestone. It’s also known to collect water and dirt, allowing for the potential to affect the stone’s transpiration rate (water movement), which could lead to issues with damp.
With the use of industry-leading technology, we’re able to effectively and efficiently remove algae from all types of brick, stone or surface without risk of damage to the substrate. Accredited by Stonehealth, we have vast knowledge and experience in returning stone and brickwork to “as new” conditions.