Roof Cleaning

Have you noticed black streaks or dark discoloration on your roof? Many people believe the dark stains are an indication of the shingles going bad and expect to have the roof replaced. In fact, the dark stains and streaks are caused by a form of bacteria named "gloeocapsa magma", which feeds off the lime deposits in the shingles.

The dark areas are formed on top of the algae to protect it from UV rays from the sun. If you look closely at a roof that is affected by staining you will notice the stains are worse in the areas of the roof that receive less sunlight and are shaded. Roof algae thrives in shady and humid environment and will eventually damage the roof and can even spread to neighboring homes. The algae will continue to grow unless it is killed by a strong mildewcide solution.

Roofs stained by roof algae can be safely cleaned, however, no pressure should ever be used in the cleaning of asphalt shingles. Even low pressure can cause shingle grit to be loosened and removed, which will reduce the life of the roof. HydroClean, offers a No Pressure Roof Cleaning which uses a strong detergent solution to kill algae and has mold inhibitors to prevent the algae from growing back quickly. Roofs can be cleaned at a fraction of the cost of replacing the shingles.

How we clean roofs:

We clean using the guidelines of ARMA (Asphalt Roofing Manufacturers Association)

  • We apply a strong mildewcide solution to the roof which kills the algae at the roots
  • We carefully wet and rinse all areas of the home that may come in contact with the strong cleaning solution
  • We carefully wet and rinse all plants and vegetation to prevent damage from the cleaning solution
  • Heavy moss and lichen will turn white and die, moss must be allowed to fall off naturally with several rains to prevent damage to the shingles, typically it takes 30-40 days for moss to completely be removed.
  • For maximum cleaning results the solution is left on the roof, once it rains the solution will be reactivated and further cleaning will take place, some spots may take a few weeks to completely clean, if there are any spots left after 4 weeks we will come and respray those areas for no charge.