Thanks to all of you that helped me with my roof cleaning project.
I was going to hire someone - or rent a pressure washer. Instead - I
made a solution of 10% bleach and 90% water - kept it mild in case it
dripped on our plants. I sprayed it on the roof with a small pump
sprayer - let it sit a while - brushed it with a long handle brush I use
to wash my camper - then hosed it off with a regular garden hose - low
All of the stains disappeared - I checked the gutters to make sure I was
not washing off the shingle "grit" - I was not. One day later - the roof
looks like new. I plan to go up today and do it again on the spots that
Thanks to those that gave me the bleach advice.
I've used 10-inch wide pure sheet zinc near the roof ridge. Works quite
well, and I understand this is a common approach.
Doubt that wire would work, but sheet copper might, as the brick walks under
my copper gutters' drip line have bare spots where no mold grows.
Wait a few months. The black stains will return. They may be
unsightly, but you are doing more damage using the brush. When you
replace your roof, get mildew/mold resistant shingles.
On Sat, 05 Mar 2005 12:31:55 -0500, Harry Everhart
Thanks for all your help and tips.
The roof looks great now. It was not washed in 10 years - so if the
grime takes that long to accumulate again - I will be happy. I plan to
replace the shingle in 5 years. I used a very soft bristle brush - like
a car brush. Just enough to agitate the sodium hypochlorite solution. I
also used a garden hose to rinse - not my pressure washer. I have lots
of big live oak trees and long needle pines shadowing my home - their
drippings seems to cause the problems. I am sure they will come back.
I presentaly have this problem...lucky for me the problem areas face
the rear of the property....not visable from the road but sitting by
the pool or down by the garages it looks like hell....
Guess I will live with it a "little" longer but when I reroof I will
install dark shingles...IF I live that long...lol
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