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.
How do you clean moss off roof tiles.
Hose off and brush all moss loose from your roof shingles.
Before you start this step disconnect any water tanks from the gutters so no chemicals get in to your water storage.
This should be enough to clean the dirt and moss on roof tiles in most cases although it may be a lot messier when the dirt and water gets blown about.
Step 1 clean up any organic matter on the roof such as twigs leaves or other debris.
It can also damage certain types of roof so is only a suitable option in some cases.
How to clean algae or mold off your roof shingles living in a humid area of the country like florida you ve probably seen your asphalt shingle roofs with unsightly dark streaks on them.
A blue green algae known as gloeocapsa magma could be the reason you have the algae which is spread by airborne spores.
Carefully place a ladder near the area of moss growth and don slip resistant shoes old clothes rubber gloves and eye protection.
That way you always walk onto a dry tile.
Using a power washer on a roof is a personal choice however you can read my guide called should i use a power washer on my roof to learn about any potential problems caused by.
In addition to rotting and possibly damaging your roof organic material is one of the chief growing places of both moss and lichen.
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 can remove moss and lichens from your roof by using vinegar as a environmentally friendly weedkiller.
After cleaning you ll also need to put some defensive measures into play to prevent roof moss from growing back.
When you are spraying on a roof always start on one side and walk backwards away from where you have sprayed.
Now apply the anti moss spray across all the tiles on your roof.
Before you clean moss off a roof you ll need to consider how you want to kill the plants and remove the dead layers of moss.