I live in FL where algae growing on the roof is a big problem. When I
had a tile roof I had it sprayed every year with some kind of
mildewcide....a man comes around and does several houses in the
neighborhood. Last June I got a new GAF ultra Timberline shingle roof
that is supposed to be pre-treated with some kind of chemical to keep
algae from growing. So, when the man came around I said I wouldn't be
needing the treatment anymore. He said the stuff that was used to pre-
treat roofs didn't really help and I should go ahead and let him treat
mine. I didn't .. because I was afraid it might affect the warranty.
I called the contractor who said I didn't need anything else and I e-
mailed GAF while waiting to hear from contractor. Haven't heard back
Thing is, there are several houses around me who have newish roofs -
older than mine but not a lot older - and they are beginning to show
dark spots in places. Now I am wondering if I should call the guy
back and have him treat my roof before I get spots ... Anybody know
whether the GAF anti-fungal properties really work or not? Thanks.
On Mar 9, 2:35 pm, email@example.com wrote:
I talked to the technical representative from GAF today. She said
that spraying the roof would not affect the warranty. She also said
that it should not be necessary. The copper oxide granules in the
shingles should protect it for 10 years. I have decided to wait and
if I have a problem down the line, I will call the man and have it
sprayed then. Thanks again for all the help.
Why not actually answer some of the questions here? This is just a chicken
shit way of getting people to you web sit. Trying to sell something? We all
contribute tot he group, not just entice people away like some stranger in
Been there, done that -- South Florida's heat/humidity overpowers the zinc
strips. Instead of having solid mold/mildew you get mold/mildew with
I'd suggest that unless you have a HOA that's uptight about mildew on roofs,
you just accept it as a fact of life and let the GAF shingles do whatever
they're capable of. IMHO, over the course of years you'll have more shingle
damage from walking around on it spraying chemicals than if you just let it
age gracefully -- especially true for others with concrete or barrel tile
The strips (zinc) do little or nothing here in Oregon. I have the
Algae resistant shingles, and haven't seen a sign of algae in two
winters now. Pretty good for the Pacific NW and also having a couple
trees near the roof. Not sure how they'll do in the long run, but so
far so good.
As for the original poster, the contractor is full of BS, do nothing
until you see the first signs of moss, then get it treated. BTW it's
not a coating, the shingles are embedded with copper.
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