To keep the algae from coming back insert 6 inch wide strips of zinc or copper under the row of shingling closest to the roof peak leaving an inch or two of the lower edge exposed to the weather.
How to get moss off roof.
Take hold of the soft bristle brush and scrub away any remaining moss.
Point the hose towards the top of the roof and rinse off the moss killing solution along with the dead moss.
In the seams use the sharp edge of the scraper like a dental pick to force out the moss.
To clean either algae or moss the association recommends putting on protective gear and protecting plants spraying with a 50 50 mix of household bleach and water allowing that to sit for at.
It also kills the spores which enables the moss to spread.
Moss can be removed physically with water and a stiff brush on a pole or a scrub brush chemically or a bit of both.
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.
Experts recommend that you save roof moss removal for a cloudy day.
It doesnt harm plants or grass so it doesnt matter if there is run off from the roof.
Then use a long handled soft bristle scrub brush to remove the moss from the roof scrubbing from the top down to avoid lifting.
Rinse the roof again with the hose to remove any remaining loose moss sitting on the roof.
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.
Use sodium percarbonate its a granule which produces oxygen when mixed with water.
That way whenever it rains some of the metal molecules will wash down the roof and kill any algae trying to regain a foothold on your shingles.
Climb up to the roof and begin scraping off dead moss from the shingles using a putty knife or painter s 5 in 1 tool and working from the bottom up.
This is oof cleaning products which should be left to absorb into the moss for at least 20 minutes will not evaporate as quickly as they would on sunny days.
Hose off the area with plain water spraying at a downward angle.