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WHY ARE THERE DARK STREAKS ON MY ROOF?

Written suggestions provided by Skylight Roofing Tri-County / The Villages - July 2023

We suggest you only allow a licensed roofer to access the roof prior to allowing a pressure washer, soft-wash, unknown individual, or handyman on the roof to provide professional advise.

We always provide a free “zero-hassle” review @SkylightRoofingVillages: 352-552-4766

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Algae Growth on Asphalt Shingles here in The Villages

Algae growth may cause discoloration on roofs resulting in brown or black streaks on a rooftop. Side note: The discoloration could also be “aggregate-loss” (granular’s, sand, pebble) that has loosened over many year as now only exposing a the “asphalt-fiberglass mat (thus color loss); based on roofs age here in The Villages, StoneCrest, Spruce Creek, Etc.

Algae may be mistaken for soot, dirt, or tree droppings, most of which typically produce only localized discoloration.

Dark streaks, or roof discoloration caused by algae, happens in varying degrees across the U.S., especially in areas exposed to warm, humid conditions. It is most widespread in the eastern United States and is commonly found on Florida roof homes.

The primary species of algae that tends to collect and grow on roofs is called “Cyanobacteria Gloeocapsa Magma Algae” which is contained in and transported through the air from many tree varieties including male oak trees and magnolias.

Green algae (typically green in appearance) or moss sometimes found on roofs with northern exposure, overhangs or high moisture areas, is not the same species.

Can You Remove Dark Streaks, or Algae Discoloration, from an Asphalt Roof?

Algae discoloration can be difficult to remove, but may be lightened by having Skylight Roofing Villages spray a diluted solution (Similar to Wet-and-Forget that works over time release trisodium phosphate) without up-charging, bleaching out your roof, never adding high-pressure as some do, Etc. This will add beauty to the roof area and brighten.

Disclaimer: When deciding to clean your roof we recommend you consult a licensed/certified roofing professional. If you decide to clean your roof yourself, please keep in mind that the roof will be slippery when wet and caution should be taken when performing this task. Wear appropriate fall protection when on the roof and proper PPE, such as slip-resistant shoes/boots and eye protection while cleaning the roof.

How to Lighten Dark Streaks, or Algae Discoloration, on an Asphalt Roof

1. Prior to applying the solution, all ground vegetation directly around the roof should be cut back.
2. Solution should be applied from bottom to top and then make your way down on ridge as not to disturb application.
3. This solution should be sprayed on the roof and left untouched for approximately 10 – 12 hours.
4. Do not scrub or use high-pressure power washing equipment. This will loosen and remove aggregate granules, thereby shortening the life of the roof covering.

How Does Algae Affect the Performance of Asphalt Shingles?

For over 20 years, Skylight Roofing has not seen evidence that algae deposits affect the performance of asphalt shingles. Algae, or streaking, is more of an aesthetic problem and may impact the look or curb appeal of your home.

What Are NEW Algae Resistant (AR) Shingles?

Asphalt shingles with algae-resistant mineral granules remain the most effective solution available for reducing cyanobacteria Gloeocapsa magma algae growth described above. These products incorporate metals, such as copper-lined mineral granules, to reduce algae growth.

Experts realized that metals, such as copper, have algae-inhibiting properties after noticing that algae staining was reduced or did not exist beneath metal vents or flashing on a roof.
Skylight Roofing offers a complete line of algae-resistant asphalt shingles* that feature StreakGuard® Protection, an algae-inhibiting technology to help reduce algae growth.

Free “Zero Pressure or Sales” Estimates and Honest Roofing Inspections:

Sumter, Marion, Orlando, and Tampa Offices

352-552-4766 or 888-520-0363

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