Union County Roofers: Article About Removing Black Stains From Roofs
When asphalt roofs remain wet due to accumulation of wet leaf debris or because it is in the shade, they often tend to develop black stains. While the black streaks can potentially be mold, it is most likely algae growth. While algae growth will not cause much damage in the short term, it is in the homeowner's best interest to remove it as soon as possible.
Part of the problem is that algae needs moisture to survive. When it grows on the roof, the algae traps moisture against the shingles, potentially leading to premature aging and granule loss. It is highly recommended that those who are having trouble with algae stains contact their Union County roofers to help fix the problem so that further damage to the roof can be avoided.
One way to prevent algae from growing on the shingles is to install shingles that are resistant to algae growth. These shingles have copper granules embedded in the top layer. While this is a great option for those who live in areas that often have high humidity levels, it may not be in the homeowner's best interests to reroof the home at this time; however, it could be a possible solution in the future.
For those do not have algae resistant shingles, a chemical cleaning will take care of the stains.
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There are several commercial products on the market that are designed to get rid of the stains. Oxygen bleach and chlorine bleach can also be used; however, homeowners should be aware that this method is only a temporary solution and that regularly cleaning the roof with these types of materials can be damaging in the long run. Additionally, going up onto the roof can also cause damage to the shingles; if the roof needs to be cleaned, it is highly recommended that the cleaning be done by expert roofers who have been properly trained.
Homeowners should never use a power wash to rid the roof of stains. The high pressure of the water can cause the mineral granules to be lost, or it can even result in the formation of cracks in the shingles. Homeowners should also keep in mind that a simple cleaning is only a temporary solution. One of the best ways to keep the algae from regrowing is to have an expert roofer install a strip of zinc or copper along the roof ridge or the ridge vent. While these strips may have to be replaced in the future, they provide adequate protection against algae growth.