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Copper / Zinc Strip Failure – Moss in the Portland Area

Posted June 15, 2011 by Patrick Morin

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 starts 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 in half the time if it was maintained or was in an area where there wasn’t moss problems.

Also, in an area of debris, you can’t let this happen. 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 a moss so we are going to help this client.

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