The bottom line preventing algae and moss from growing on your roof is easier than trying to remove it.
Remove green mold from roof shingles.
The most common culprit is actually a blue green algae known as gloeocapsa magma that is spread by airborne spores.
Run your gloved hand over the shingles to check for any slimy mold remaining after you re finished rinsing.
Start on lowest row of shingles and work your way backwards to the upper part of the roof.
Continue spraying until you see runoff then let the chemicals sit for 15 20 minutes to soak in and begin attacking the mold.
The roofing contractors mix this bleaching agent with water and spray the roof down paying close attention to areas that are stained.
But outdoor heavy duty cleaning usually calls for more heavy duty mixtures such as tsp and chlorine bleach see the tsp.
If they are severely molded you may want to give it a little longer.
If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs.
Removal can take several months before the moss can be blown away revealing clean shingles underneath.
If you ve had experience with mold and mildew in the home you know the best mildew remover is chlorine bleach.
Removing moss and algae from asphalt shingles.
Spray the entire roof thoroughly.
The mild chemical reaction caused by rainwater coming in contact with the zinc inhibits the growth of mold and mildew.
This will prevent the solution from draining in your direction.
Always keep your roof clear of overhanging branches and clean your gutters regularly.
Start from the top shingle and rinse downward to prevent water seepage.
The choice of roofers for removing mold among roofing supplies is a special bleaching agent formulated for roofs.
They will let the mixture stay on the roof for a bit to ensure it penetrates the stain.
Carefully place a ladder near the area of moss growth and don slip resistant shoes old clothes rubber gloves and eye.
Allow the solution to soak into the shingles for at least 15 minutes.
Apply liquid cleaners with a hand pump sprayer or with a pressure washer on the lowest setting so as not to cause any damage to the shingles.
Hose off and brush all moss loose from your roof shingles.
Start from the top shingle and rinse downward to prevent water seepage.
If some remains apply the cleanser again wait 10 more minutes and repeat the rinse process.
Installing zinc strips under a row of shingles near the ridge of the roof will prevent mildew from forming.
A homemade cleaner of one part liquid chlorine bleach to one part of water can also be effective in removing and killing moss that clings to the roof tiles.