What are the black stains?
The black stains are caused by a cyanobacteria frequently referred to as algae (gloeocapsa magma) that feeds on organic material (typically crushed lime stone) now used in composition roof shingles. Algae growth on roofs occurs to varying degrees in all regions of the country, especially those subjected to warm humid conditions. The NEPA area has a particular problem with dirty roofs due to the consistent marine layer that often covers the coast and certain inland areas. Nearly all types of roofing are susceptible to staining and discoloration. It is, of course, most visible on lighter colored roofs and less visible on darker shades of roofing.
Will pressure washing do damage to my roof?
Yes. pressure washing will dislodge the granules from the surface of the shingles and can scar the shingles causing more problems then you started with. Shingle manufacturers make it very clear that no pressure should be used to clean roofs. Although leaving the roof apparently clean looking, pressure washing alone does not kill the algae and the problem quickly returns. Tile roofs are also susceptible to damage from pressure, particularly the glaze finish and color pigment.
Do I need to do anything before you come?
It would be appreciated if you could do a few things the night before we come out to do the roof cleaning service: Put all lawn equipment, furniture and/or toys inside. Keep all animals inside or out away from the home.
Put any special plants out away from house (if possible.) Park vehicles on street or in garage. Pretty much just clear everything out away from around the house. We will be rinsing areas around the building during the treatment.
Do you have references?
Yes. We have many happy customers who would love to share their roof cleaning experience with you, please feel free to request a list by e-mail.