How to prevent algae growth on a brick patio

Algae, moss and mould can flourish on brick patios in damp, shady locations. Lack of sunlight from overhanging trees and dense vegetation encourages algae growth on brick patios. Algae can ruin the appearance of your patio, causing landscapes and gardens to appear unkempt and neglected. Their slippery texture also makes patios dangerous to walk on. However, certain techniques can effectively rid algae from brick patios and prevent future growth.

Sweep the patio with a stiff broom to clear any debris and loosen existing algae.

Mix the chlorine bleach and water in a plastic bucket. Spray the bricks and nearby vegetation with water from a garden hose to protect them from bleach run-off.

Dip a nylon scrubbing brush in the diluted bleach solution. Scrub the bricks with the bleach solution to discourage algae growth on the patio.

Rinse the patio with water from the garden hose to wash away the bleach solution. Blot the bricks with towels until completely dry.

Trim back overhanging tree branches and vegetation using pruning shears. Expose the patio to plenty of direct sunlight to discourage algae growth.

Relocate any nearby sprinklers that disperse water onto the patio. Move the sprinklers further back to prevent moisture on the patio.

Regularly sweep the patio with a stiff broom to remove the organic debris that algae can feed on, such as branches and leaves.

Lay the strips of copper-coated sheet metal along the perimeter of the patio to further prevent algae growth. Stick the metal strips to the bricks with high-strength construction adhesive. Apply the adhesive according to the manufacturer's directions on the product's label. The copper, which is toxic to algae, will leach out of the strips in small amounts and prevent growth.


You can substitute a commercial algicide for the diluted bleach solution. Apply the algicide according to the manufacturer's instructions.


Test the bleach solution on a small area of the patio to ensure no discolouration or damage occurs to the bricks.

Things You'll Need

  • Stiff broom
  • 250 ml (1 cup) chlorine bleach
  • 4.5 litres (1 gallon( water
  • Plastic bucket
  • Garden hose
  • Nylon scrubbing brush
  • Towels
  • Pruning shears
  • 5 cm (2 inch) wide copper-coated metal strips
  • High-strength adhesive
Cite this Article A tool to create a citation to reference this article Cite this Article

About the Author

April Dowling first started writing in high school and has written many news articles for newspaper and yearbook publications. She is currently pursuing a career as an online writer and affiliate marketer. Dowling writes for several websites and keeps many blogs.