The water pressure will remove the granules that are important for protecting your roof.
Power washing roof is it bad.
Tempting as it might be to blast away unsightly moss and algae using a pressure washer to clean your roof is dangerous not to mention potentially damaging.
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Of course some chemicals can harm your roof as well and the runoff could cause problems with your landscape or parts of your home.
Of laundry strength liquid chlorine bleach and water.
Never pressure wash your roof if you have asphalt shingles.
But you can spot treat the moss.
This is the best way to clean a roof if you have asphalt shingles.
So why is power cleaning bad for your asphalt roof.
Power washing a composition roof will remove the protective granular from the outer layer of the shingles leaving the shingles less protected from the sun and other harsh weather conditions.
Use a pressure washer which can loosen shingles and seriously damage your roof.
So you could actually shorten the life of your roof by being overaggressive with a pressure washer.
Not to mention using a pressure washer from a high place is dangerous.
Use a sprayer attached to garden hose that s filled with equal parts chlorine bleach and water.
Should you pressure wash it.
By billie jo jannen it s generally not necessary to pressure wash a shingle roof for the purpose of removing ordinary dirt and leaves and pressure washing can potentially damage the shingles.
They go on to add.
It will also leave gouge marks in the lower layers leaving them more vulnerable to the elements.
I don t recommend you power wash the whole roof because you re going to blast off a lot of the minerals that are on top of that roof that protect it from the sun.
Once you squeeze the trigger the powerful recoil on the spray wand can throw you off balance and off of a ladder.
There is a chance that the pressurized water could damage your shingles.