At best slimy black mold.
How do you remove mildew from roof shingles.
You can find more information on these special roofing shingles here.
To remove the algae from asphalt shingles you have a few options.
First you need to ensure that roof shingles and tiles are not broken chipped or damaged as water applied at a high pressure is likely to amplify the damage and seep through any cracks.
These stains will discolor your roof and damage the shingles over a period of time if left alone.
They call it the algaeblock system.
One way to determine if it s mildew is to put a few drops of chlorine bleach on to the black mark.
A few years ago commercial roof cleaning products containing hydrogen peroxide lye were commonly recommended to remove mildew.
How to remove algae from asphalt shingles.
However at the time of this writing they do list a number of companies that.
The less expensive solution is to spray wash the roof with a 50 percent mix of water and bleach to get rid of the algae.
If it s dirt the dark stain will remain but if it s mildew the stain will go away.
Extensive mold growth can also expose the interior of your attic or crawlspace to mold spores carrying the problem over to the inside not to worry though because you can clean the mold off with basic household bleach and save.
A blue green algae known as gloeocapsa magma could be the reason you have the algae which is spread by airborne spores sometimes it can also be caused by an accumulation of mildew mold dirt or defective shingles.
When that happens it is generally caused by mildew algae mold or dirt stains.
These black streaks are unsightly and can diminish the appearance of the entire exterior of the home.
3m is not a manufacturer of asphalt shingles just the granules.
It is not uncommon for roof shingles to turn black over time.
How to clean mold off a roof.
You could replace all the roofing with new shingles dark enough to disguise the staining or with shingles laced with copper granules which are lethal to algae.
They re likely to damage the shingles.
It s easy to let a mold problem sneak up on you on in out of the way places like the roof of your home.
But that would only make sense if the shingles were worn out.
Remove black stains from roof shingles to preserve the appearance of your home s roof.
No pressure washers please.
This unique advance in shingle technology gives long term fungus protection for the entire roof.
Mold stains can form on roof shingles that are in permanent shade.
You could use regular household bleach to remove the algae from your roof.
Also when using a power washer you will need to stand on the roof above the mold so you can point the power washer in a downward direction.
