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Part of a good healthy roof is one covered with the
colored granules we see these are there for beauty but
also to protect the asphalt from the aging properties of
the sun. When these granules are removed, the asphalt
below will dry out and not be water proof any more. This
is why pressure washing a roof in Perry Hall is not
recommended by the Shingle manufactures and even American
Roofing Society. Some companies take care with low
pressure but workers can get careless and unless you --
yourself -- inspect your roof afterwards, you have no way
to know if your pretty clean roof is actually damaged --
Blue green algae doesn’t hurt the life of the roof in
Perry Hall...
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