On Mar 8, 1:23 pm, nprlisner wrote:
jp wrote :

On Mar 7, 4:45 pm, Dottie wrote:

Get in touch with a good roofer and ask him to install a copper strip
across the peak of the roof on both sides of the roof and when it
rains the copper will react and stop mildew, it works, good luck henry
penta, i seen this on the, this old house progran.

The copper suggestion is the way to go.






The new roof is medium brown - not too dark - but not as light as the
neighbors who both have gray. They don't have algae yet and their
roofs are two and three years old. I have some sort of metal strips
along the outside edges of the roof. The very top has the Cobra ridge
vent .
The man who sprays does not have to walk on the roof. We used to have
a tile roof (old one) and he couldn't walk on it or pressure wash
it ... just spray from the sides....which worked out o.k. The east
side of the old roof used to get mold/mildew on it because it was not
in the sun as much as the west side. We don't have large oak trees in
our yard.

I do want to talk to someone at GAF before doing anything - probably
will call Monday. Thank you all though.