I have read that an asphalt shingle roof should not be pressure washed,
but I have also read that it is ok at low pressure.
Using low pressure, a guy pressure washed my asphalt shingle roof. Now
there are some irregular areas that are lighter than the rest. The
chairman of the board (my wife) does not like this. I think the guy
said the lighter areas are the color the shingles are supposed to be
(the color they originally were) and the darker areas still have stuff
on them that the light pressure washing did not remove.
Is there a coat that can be sprayed on to get my roof to be a uniform
I know of nothing to do what you want, but the reality is that soon the
dark area will probably return and it will be a moot point. I did
pretty much what you describe to my light green colored roof to remove
the fungus from the shingles. Bleach and another chemicals did improve
the situation somewhat, but since there needs to be no other nearby
homes with the fungus in order to give your home a chance of it not
returning, your fix is probably very temporary.
Although it is possible that too much pressure was used, if the guy had
any knowledge of how to improve the roof, that is probably not why there
is uneven color on your roof. I truly hope I am wrong and your roof
stays nice, but I do not believe those doing such jobs make such a
promise. Good luck.
He probably washed away five or ten years of life too. You could try a
cleaner and hose, but that is a crap shoot. It also depends on why the roof
is darkened to begin with. Since you'll probably be getting a new roof in
a year or two, get a dark color.
It's difficult to answer your question correctly if you haven't
identified what the dark spots are?
If they are bald shingles, caused by pressure washing, then it's
time to re-shingle. If it's black algae, fungus, or moss........
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