What causes dark spots on roof shingles?
What causes dark spots on roof shingles?
Answer. Those black streaks on your roof shingles are most likely an algae called gloeocapsa magma, or as it is more commonly referred to, a blue-green or black algae. Algae is a solid deposit of spores and dirt, another form of mold.
How do you remove black stains from shingles?
A mixture of trisodium phosphate (TSP), bleach, and water will also remove stains. Oxygen bleach lightens stains as well and is less harmful to the environment, but it doesn’t produce as immediate or dramatic an effect as chlorine bleach.
What are dark spots on my roof?
Although these dark spots and ugly black streaks on your roof may look like dirt, mildew, soot or mold, what they really are is algae. The most common type is known as gloeocapsa magma—also known as blue green algae. Although algae can be found on all types of roofing, it tends to be most common on asphalt shingles.
Can you power wash roof shingles?
NEVER aim your pressure washer up the roof, as it can push water under the shingles. Spraying water under your shingles can both tear off the shingles and force water under them and into your home. Cover a few shingles at a time, and move the wand slightly closer to the surface as more power is needed.
How much does it cost to clean roof?
Cleaning a roof costs $294 and $593, or $433 on average. Expect to pay between $0.20 and $0.60 per square foot. Regular roof cleaning makes it last longer and improves your curb appeal. This is a dangerous project that can damage your home, so it’s best to hire a pro.
What causes black and brown stains on roof shingles?
Dark black or brown roof shingle stains are often caused by black algae, bleed-through or extractive bleeding of asphalt, dirt, soot, or organic debris. But there are other roof stain colors and causes.
Why do I have green stains on my roof?
At DEBRIS STAINS on ROOFS – Black Debris Stains on Asphalt Shingle Roofs we describe carefully sweeping off this trash to extend the roof life. Green roof stains on roof shingles, clay tiles, cement tiles, and asbestos cement roof shingles or newer fiber cement roof shingles are often caused by algae.
What causes discoloration on the roof of a house?
Common Causes of Roof Discoloration 1 The Usual Suspect: Green or Black Algae Stains. Across the entire eastern half of the country, roof shingles tend to grow a species of algae called Gloeocapsa Magma. 2 Other Causes of Roof Discoloration. Quite a few other issues can cause stains on a roof. 3 Roof Stain Removal & Repair in Baltimore. …
What is the black stuff on my roof?
These black roof algal stains are sometimes misnamed or misidentified as a black fungus or even a “mildew”) .
How do you remove black stains from roof?
Thankfully, removing and preventing mold streaks on your roof is a fairly simple process. Existing black streaks on your roof can be easily removed with a homemade solution. All you need is bleach, warm water, a spray bottle, and a garden hose with a spray nozzle.
Which is better light or dark shingles?
It is a well known fact that dark coloured shingles absorb the most heat while light coloured shingles reflect more heat. Light shingles will lower the attic temperature and may help you save on cooling costs. Dark shingles may help heating the home in cold climates and also will assist with snow melt.
What are black spots on roof?
The black spots discoloring your asphalt roof are more than likely the pervasive and prevalent algae known as Gloecapsa Magma. These roof-invaders require a moisture-rich environment, usually supplied by dew and shade. The first stains usually appear on the north-facing sides of a roof, which receives less light,…
What is the best brand of asphalt shingles?
A better quality of shingle will last longer, resist algae growth longer, and be more resistant to wind and hail damage. The three “top” brands are Certainteed, Owens-Corning, and GAF. These companies make high quality shingles and are about the same price. The next lower tier includes Tamco and IKO.