While an occasional cleaning might not harm your roof repeated use of harsh chemicals or the erosive effects of pressure washing can damage or shorten the life of asphalt shingles.
Moving algae from tile roofs.
Clean the roof tiles with a high pressure water spray.
In geographical areas that are often damp or have high humidity another enemy to a roof is the growth of algae and roof moss once it takes root on the surface it seeks dark and moist areas in which to spread and grow.
Give the anti moss spray time to do its job and then use the high pressure cleaner to wash the tiles down.
This will remove all the moss and lichen as well as any built up dirt.
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Roof algae generally have a black green hue.
Algae stains can be removed by cleaning though they usually return.
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You may think you have roof algae when really you have moss mildew or mold.
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.
A blue green algae known as gloeocapsa magma could be the reason you have the algae which is spread by airborne spores sometimes it can also be caused by an accumulation of mildew mold dirt or defective shingles.
So it pays to clean your shingles as soon as you spot algae growth.
A home s roof is absolutely vital as it protects your house from harsh weather and other environmental elements.
But that would only make sense if the shingles were worn out.
Can have moss and algae accumulate on their roofs.
As you did in the previous step walk backwards when you are spraying away from the wet tiles and onto the dry.
Those places that receive more rainfall and have sustained high levels of humidity have more moss and algae growth as the moss and algae need water to grow and multiply.
The most common class of roof algae is gloeocapsa magma a bacterium that eats water and expels oxygen.
Roof tiles average 425 to clean.
These materials can last much longer than asphalt but take extra care to clean without damage.
But once the algicide wears off your roof hosts an all you can eat buffet for the neighborhood algae spores.
Do it yourself and save big bucks.
Using shingles that have been treated with algicide keeps the growth at bay for about 10 years thus the 10 year algae warranty.
Algae grow most often on wood and asphalt shingles or concrete tiles especially if they do not get a lot of sunlight.
Hire an experienced pro to help make sure that your project doesn t turn into a repair job.
Roof tile cleaning cost.
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.