Remove limescale build up on external brick is important to improve the appearance and longevity of your building. We got this picture and a request to remove the damage from one of our customers in Epsom. We thought we would share with you what we know.

Why does limescale build up on external bricks?

The Limescale builds up in this case is due to evaporated water containing limescale settling on the cooler brickwork (Source). Another common name for limescale is calcium deposit (Source).  More, the high humidity from the condensation provides fertile breeding ground for mould to grow and spread, shown in the picture.

How to Clean Limescale or Calcium Deposits

If you can catch it early enough, use 50/50 white vinegar and water. Scrub and spot treat the affected areas until removed. The vinegar is acidic which breaks down the mineral crystal in the calcium. Although, often it is more severe.

To remove severe case of limescale on external brickwork, you will need professional help. The limescale will need to be treated with a diluted brickwork acid, start with a low strength then increase the concentration depending on the resilience of calcium deposits. Agitate the treated brickwork with a soft brush. For the moss, a sodium hypo mix should be used to destroy the organic matter. Once treated and penetrated, carefully use a pressure washer to remove the limescale and moss. Use a low pressure and build up if needed, as the brick acid will soften the mortar and high-pressure water can remove the mortar especially when weakened. Remember to consult an expert when using chemicals, and for all experts to use their PPE.

There we have it, how to remove limescale on external brick. Once completely dry use a efflorescence and calcium deposit blocker, or water repellent. This will deter the limescale and moss to reappear. If your property shows signs of limescale and moss build message Surrey Jet Washing.