The presence of algae on the roof is an indicator that this roof area is in a shaded spot where you may want to be alert for development of moss or other roof problems but the level of damage from algae is probably low even less than that caused by lichens.
Moss on roof problems.
Moss only grows where there is a lot of water.
A simple mixture of bleach and water will kill the moss causing it to dry up release from your roof and blow off in the wind.
Honestly it doesn t hurt to try the simplest method first.
This can cause the shingles to curl up and get separated from the surface of the roof.
Moss thrives in damp moist areas including roofs that are north facing or shaded by trees.
Once moss starts growing the roots make their way beneath the shingles.
A garden hose some water and a good.
Perhaps your gutters aren t draining or your roof slope is too low.
Moss is not a huge problem unless you ignore it if you find moss on your roof don t panic.
This simple plant doesn t produce any flowers and it grows in a blanket.
Moss roots under shingles roots are what cause most if not all of the problems related to moss growing on your roof.
If you have moss on your roof you likely have an underlying water problem.
What can i do about moss on my roof.
This one is a bit trickier.
Moss can be bleached away but bleach will also damage and discolor your rooftop.
Avoid any aggressive cleaning methods that might damage the roof surface.
Moss has the ability to damage your roof s integrity greatly.