Continue spraying until you see runoff then let the chemicals sit for 15 20 minutes to soak in and begin attacking the mold.
How to get rid of green mold on roof shingles.
However if you re in a humid area and have a different type of roof you really can t stop it.
Well you can get zinc strips if you re concerned about stopping the algae from growing on your shingle roof.
Fill a bucket with warm water and mix in the oxygen bleach powder according to the package directions.
Hose off and brush all moss loose from your roof shingles.
Carefully place a ladder near the area of moss growth and don slip resistant shoes old clothes rubber gloves and eye.
Start on lowest row of shingles and work your way backwards to the upper part of the roof.
Next rinse the shingles thoroughly with a garden hose at low pressure.
This will prevent the solution from draining in your direction.
Stretch copper wires across the roof every 10 feet down the roof slope tacking them to the roof or nailing or tacking the wire to fascia or a solid surface on the side of the structure.
Allow the solution to soak into the shingles for at least 15 minutes.
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.
Test a small area.
Installing zinc strips under a row of shingles near the ridge of the roof will prevent mildew from forming.
They re likely to damage the shingles just be sure to wet your foundation plantings first and rinse everything in clean water when you re done.
If they are severely molded you may want to give it a little longer.
The mild chemical reaction caused by rainwater coming in contact with the zinc inhibits the growth of mold and mildew.
Spray the entire roof thoroughly.
Mold stains can form on roof shingles that are in permanent shade.
Dip the scrub brush into the solution and test it to see if it is effective at removing the staining.
These stains will discolor your roof and damage the shingles over a period of time if left alone.
Start from the top shingle and rinse downward to prevent water seepage.