Check around your gutters around windows and doors and along the base of your walls.
Remove green and black patches from gutters.
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.
Simple green any oxygen bleach whitewall tire cleaner alumklean by wsi or a mixture of 1 3 cup of a strong household detergent and 2 3 cup of tsp cleaner.
This algae growth usually begins as small spots and then eventually becomes visible streaks.
With the right tools and routine cleaning you can banish mildew from your.
Roofing tar and asphalt can leach down on the gutter while dirt mold and pollutants can become electrostatically bonded to the gutter s paint.
They prevent water from getting into your basements or crawlspace and protect windows and siding especially wood from extreme water penetration.
If you have problems with mildew around your gutters this will show up as black spots on your gutters.
In addition stay away from using harsh scrubbing brushes as these can ruin the finish on your gutters.
These cleaners can destroy the finish on your gutters.
3 steps to remove mildew from your home exterior don t let mildew spoil or worse damage your home s exterior.
The green color comes from chlorophyll which is the same substance that makes plants green.
It causes the black stains you may see on your roof.
Algae grow most often on wood and asphalt shingles or concrete tiles especially if they do not get a lot of sunlight.
It can present as green dark brown or black patches and streaks or fuzzy looking stains.
Gutters basically direct rainwater away from your home to the ground below.
These marks called tiger stripes are caused by a variety of reasons.
Rain carries them down the sides of the gutters where they stain the aluminum.
The most common type is known as gloeocapsa magma also known as blue green algae.
The most common class of roof algae is gloeocapsa magma a bacterium that eats water and expels oxygen.
Gutters can be made either from a steel and aluminum combination or from vinyl.
The algae can cause black or gray streaks that seem to run down your roof.
Roof algae generally have a black green hue.
If you have green stains on your deck or siding it s probably due to either cholophyta algae green algae or a cyanobacterium related to gloeocapsa magma.