Black Streaks on Roof

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Chemical Cleaning to Remove Black Streaking from Roofing

Gloeocapsa Magma is the scientific name for those black streaks on your roofing. Gloeocapsa is a form of algae that lives in wet humid climates. These streaks of black are not as evident in the Seattle-Tacoma region due to the majority of roofing material being of dark coloring. If your roofing substrate is light colored, it’s very probable that these stains will be found on your home.

Although, Gloeocapsa Magma is not harmful to roofing, the appearance of a home suffers tremendously. When selling a home the algae stains should be an issue that is dealt with before the home is placed up on the market. These stains are a red flag to potential home owners who may not know exactly what that black stuff is and whether or not it’s harmful to the roofing.

Soft wash roof cleaning with chemicals is a superior method of removing Gloeocapsa. This method of roof cleaning gets rid of these unsightly black streaks while keeping the integrity of the roofing intact. Power washing is not as effective at eliminating Gloeocapsa. It is also very damaging to roofing shingles. Read more here………….

In the picture to the left, a chemical solution is sprayed on the roof. Each chemical in the mix does a certain job. Within 25 minutes, the picture to the right shows the roof stains are almost completely gone. The mix continues to work on the stains and streaks until the next day of rain. After the roofs first shower, the roof is looking its best.

Going from being a white roof covered in black to being a white roof again has strong selling value for a home. Soft Washing is a great way to safely and effectively remove black streaks from your roof in Seattle. Whether your home is up on the market or you just don’t like coming home to a dirty roof, consider chemical cleaning when hiring a roof cleaning contractor.


 

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Cost to Clean a Cedar Roof in Seattle

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Cedar Roof Cleaning Cost in Seattle

The cost for a cedar roof cleaning in Seattle for a :  3000 square foot , 2 story, medium roof pitch home, averages between 800-1300 dollars. There are many expenses to cleaning a cedar roof:

  •  Labor
  • Gas for Power washer: 75-85 dollars worth for a 3000 square foot home.
  • Insurance costs
  • Chemicals [oxygen bleach and a revitalizer]

The cost for a cedar roof cleaning quickly adds up for the company performing the task. Cedar roof cleanings require meticulous attention to detail. Every square inch is cleaned for the product to turn out right. The job is very labor intensive and requires a set of skilled eyes and hands.

Cedar roofs are like ice when there is moisture and moss growing on them. A good tool to have is a pair of Korkers©. These shoes with spikes are essential to a cedar roof cleaner in Seattle. The spikes allow the wearer to grab a footing while cleaning the shakes. They do not replace other safety measures such as:

  • Lanyard
  •  Chicken ladders
  • Harness
  •  Rope

There is a lot to pressure washing a cedar roof and the right equipment and experience are necessary when deciding to tackle on the task. Many roof cleaners in Seattle won’t even touch a cedar roof as the liability for something going wrong is too high. Slips-Falls and improper use of a power washer can have serious consequences for the roof cleaner and the roofing substrate.

If you are considering hiring someone to clean your cedar roof always make sure the company’s licensed, bonded and insured. Make sure to ask for references. Cedar roof cleaning is a task that requires many years to master and some of the best roof cleaners won’t try their hands at it.

We provide cedar roof cleaning and oiling to the following cities:

Alderwood- Ames Lake- Arlington -Auburn- Ballard- Bellevue-Belltown-Bothell-Bridle Trails-Brier-Burien-Covington Crossroads -Des Moines-Edgewood-Edmonds-Everett-Evergreen-Fall City-Federal Way-Ferndale-Granite Falls-Hunts Point-Issaquah-Issaquah Highlands-Juanita-Kenmore-Kent-Kingsgate-Kirkland-La Conner-Lake City-Lake Forest Park-Lake Goodwin-Lake Stevens-Lynnwood Madison Park-Magnolia-Maltby-Maple Valley-Marysville-Medina-Mercer Island-Mill Creek-Monroe-Mountlake Terrace-Mukilteo Newcastle-North Bend-Overlake-Parkland-Puyallup-Rainier Valley-Redmond-Renton-Rose Hill-Sammamish-Sand Point-SeaTac Seattle-Sedro-Woolley-Shoreline-Smokey Point-Snohomish-Snoqualmie-Spanaway-Stanwood-Tacoma-Totem Lake-Tukwila -University Place-White Center-Woodinville-Yarrow Point

Pressure Washing removes Asphalt Shingle Granules

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Granules, the sand like element that is keeping the rain from destroying your home by way of the roof shingle. Granules are also the reason you should never pressure wash your roof. These delicate granules are held to your roof shingle, layer upon layer by a form of glue. A simple walk on your roof removes some granules, just imagine the damage a pressure washer does to it.

A.R.M.A [American Roofing Manufacturers Association] represents a majority of roofing manufacturers in North America. Their primary concern has been to find common ground on asphalt shingle manufacturing  and the process of maintenance.

Their bulletin on the proper method of roof cleaning 1 is commonly, cited by roof cleaning companies. The three main points of the bulletin were:

  1. Never power-wash asphalt shingles.
  2. Only chemical cleaning can temporary remove and combat algae stains
  3. The only long-lasting way to combat algae is to have AR [algae resistant shingles] installed.

Unfortunately, although Algae resistant shingles are reaching their teen years in service, not very homes being built to this day have them installed due to the higher cost of the shingle compared to a regular asphalt shingle. RCI-online, stated that up to 50% of all roof replacements are done for cosmetic reasons instead of from leakage or wear. 2

Sources cited:

1.http://www.asphaltroofing.org/pdf/tb_217.pdf

2.http://www.rci-online.org/interface/2007-01-ammerman.pdf