Black streaks on the north and west facing and shaded.
Roof with stains.
Black stains on asphalt roofing products such as asphalt shingles or roll roofing caused by extractive bleeding.
Catalog of types of stains on building roofs surfaces walls algae caused black or green stains on roof or other building surfaces some photos of black algae stains are at black.
While doing little harm to your shingles the black streaks caused by the algae are unsightly.
Make your shingles last longer.
Preserve the appearance of your roof by removing black stains promptly.
Clean the stain with bleach.
When that happens it is generally caused by mildew algae mold or dirt stains.
Pine sap decaying leaves and even road dirt that s drifted into the air can settle on your metal roof and stain it.
Now that you ve.
The most common type is known as gloeocapsa magma also known as blue green algae.
Your stains are probably caused by the airborne spores of a blue green algae known as gloeocapsa magma which is often mistaken for mold or mildew.
While the recipe for cleaning a roof with bleach can vary the basic formula is.
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.
Roof stains are not only unappealing to look at they also compromise the waterproofing ability of your shingles.
It is not uncommon for roof shingles to turn black over time.
Algae can be killed and the stains removed using chemical cleaners though they usually return over time.
Removing dirt sap and other stains there are a lot of different substances that can build up on your roof.
These substances can infiltrate the limestone mixture that attaches the shingle to the roof and end up harming its ability to repel water.
Here s how to clean the.
Your first priority when dealing with a water stain should be to find the.
Roof shingles are exposed to a lot of wear and tear as extreme heat sun wind and precipitation come into contact with them.
Do shingles on your north west or other shaded roofs have streaky moldy stains.
Or canada there s a chance you ll see at least one roof stained with black or dark brown streaks.
Many homeowners mistake these stains for mold mildew moss or even tree sap.
1 quart bleach 6 sodium hypochlorite 1 gallon water 1 4 cup tsp trisodium phosphate or other heavy duty cleaner don t use a cleaner that contains ammonia or is not.
Most of these substances can be removed by a mixture of cup tri sodium phosphate and 1 gallon of water.
Conceal an unsightly water stain on the ceiling and put a stopper on the leak that caused it with these stain fighting tips.
Identify and repair the root cause.
In virtually any residential neighborhood in the u s.
