In this episode, Daniel dispels the myth about the existence of a moss-free shingle.

Podcast Transcription- RoofLifeB015-127:

Shayla: Thank you for joining us today for the Roof Life of Oregon Podcast. I’m talking today with Daniel who is a roof consultant at Roof Life. And, Daniel, in Portland I’m sure you get this question a lot. Is there a moss free shingle?

Daniel: That’s a great question. There is no such thing as a moss free shingle, especially in the Pacific Northwest. If you stood still long enough, you would grow moss. It grows on everything. I mean, it’s amazing how it grows. There are homeowners that think that they buy a shingle with moss protection. Again, that animal does not exist.
They have what’s called an AR shingle. AR stands for algae resistant, not moss resistant. Some roofers, either or they don’t know or they’re lying when they tell the homeowner this. They’ll get in the house, and they’ll say, “Hey, we’ll get this better shingle, it’s an AR shingle, it’s not going to grow moss.” Again, either they’re lying or they don’t know. It stops algae.

The interesting thing about that algae resistant shingle is it doesn’t stop all of the algae. There are two or three version of that algae that it does not stop. Guess where that grows. Right here in the Pacific Northwest. It won’t stop the green slime growing out of the gutters. Nothing stops that. But as far as AR versus moss control, AR stops algae, keeps that nasty black streaking that ¬†you may see coming off the roof, does not stop the moss.

When the moss starts, and it’s going to start, it may take a few years, just because the manufacturing process of building a shingle, there are residues, there are tars and things and like that that are on the top that will keep anything from growing. All that washes away and now you’ve got a nice clean roof for the moss to start growing on. The dirt starts to sit on top, the moss grows on the dirt and it grows everywhere.

So if you want to keep moss off your roof, unfortunately, in the Pacific Northwest, you have to go with maintenance. There is no such thing as a moss-free roof. Zinc strips don’t work. Call Roof Life. We’ll come out there, see what the moss situation is, prescribe the right method to take care of that and then treat the roof every three years to keep off the moss.

Shayla: So make sure you listen carefully. Algae resistant doesn’t mean moss free or even algae free. Give Roof Life of Oregon a call to make sure they can keep that moss off your roof.


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