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Copper / Zinc Strip Failure – Moss In The Portland Area

Aerial View

We’re on a 7-year-old asphalt shingle roof. This is actually the best I have ever seen a copper or zinc strip work. This is actually copper so it matches the color of the house, so you can see that it kept the moss off for about 5 rows, and then it started growing on there and you can see how heavy it (the moss) gets as the farther away from the zinc or copper strip.

This copper strip seems to be working a lot better than the zinc strips that I’ve seen. Of course, underneath the trees, it gets pretty bad, and this moss will actually destroy this roof. It will eat it and lift it and cause it to leak half the time if it was maintained or was in an area where there weren’t moss problems.

Also, you can’t let this happen in an area of debris. This will rot out the shingles and this intersection here would be compromised if this was not maintained. Of course, we are looking at the north side and you can see all the way across the roof that for the first two or three feet that copper is working really well. Then as the copper oxide runs out of energy the moss starts growing.

Roof Life of Oregon does roof maintenance on all types of roofing. This is an example of a 40-year architectural laminated shingle 5-7 years old growing quite a bit of moss, so we will help this client.

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