January 16, 2008

Scotch Guard Algae Resistant Roofing System

 Important Benefits of the Scotchgard™ Algae Resistant Roofing System

1. What causes black streaks on asphalt roof shingles?

 Unsightly black stains on shingles are often mistaken for fungus, mildew, dirt or oil, but are actually caused by a   hardy type of algae. This common problem has increased during the past 20 years, indiscriminately settling on  rooftops from coast to coast. Dark algae streaks are visible when algae cover roofing granules the ingredient in a shingle that gives vibrant colors of white, cobalt blue or hunter green, for example, to rooftops.

The organism Gloeocapsa produces a dark-pigmented sheath to protect itself from ultra-violet rays. By the time the black streaks are noticeable, the algae usually have been growing for months or years¿the result of generations of dead algae cells built up over time.

There are no proven damaging effects of algae accumulation on shingles. However, the dark algae streaks are the number one appearance-related problem reported to roofing contractors. Consumers commonly mistake the dark stains for faulty shingles, leading them to complain to the contractor or manufacturer about a shingles performance.

Yes, but many experts and homeowners agree that it's much less expensive to prevent algae growth from the outset. The price difference is minimal when one faces the accumulated cost of frequent roof cleanings. The extra cost associated with the Scotchgard™ System refers to the materials only, because the labor cost to install these shingles is the same as it is for regular shingles.

Look for the Scotchgard™ logo on quality shingle brands with the Scotchgard™ Algae Resistant Roofing System. Many shingles feature algae resistance. But your assurance of long-term algae and stain resistance can only be achieved when the precise level of granules in the Scotchgard™ AR System is uniformly distributed across the surface of the shingle in combination with standard colored granules.