Generally this takes care of moss for 1 3 years.
Products to remove algae from roof.
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.
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.
Softwashing to remove roof algae moss we use a softwashing technique at sherwood roof cleaning power washing to clean roofs here in fairfield county.
Sodium hydroxide lye products on the other hand work better than bleach and are less harmful to vegetation.
Pressure washing can even tear shingles off your roof.
But we can prevent the lichen mold mildew and sometimes moss the algae colony produces from becoming visible as a roof stain.
Algae grow most often on wood and asphalt shingles or concrete tiles especially if they do not get a lot of sunlight.
This is the only safe way to effectively remove algae and moss from roof shingles.
The zinc needs to be applied annually though to keep the algae from regrowing similar to how chlorine gets added regularly to maintain the cool blue color of your pool.
Moss is a thick organic growth.
Roof moss removal usually requires a broom or heavy stream of water.
The most effective method of cleaning algae and moss from a roof is with a 50 50 mix of laundry strength liquid chlorine bleach and water.
But that would only make sense if the shingles were worn out.
Some homeowners also try to get rid of algae by using bleach.
However the force of the water can cause your shingles to lose their protective granules.
The most common class of roof algae is gloeocapsa magma a bacterium that eats water and expels oxygen.
Bleach may kill the top layer of algae and lighten the stains but it doesn t kill the underlying algae.
Apply with a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes and then rinse thoroughly with low pressure water.
Algae is just a thin film of organic growth that can be removed by washing the roof with certified organic oxygen bleach.
Copper strips prevent the growth of moss and algae.
Roof algae generally have a black green hue.
So the algae colony gets right back to work.
Spread it along the ridge of the roof then let the rain do it s job of dissolving it.
You may think you have roof algae when really you have moss mildew or mold.
A mixture of trisodium phosphate tsp bleach and water will also remove stains.
This wipes out the algae colony before it gets large enough to be seen from the ground.