Thread: Moss on roof
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Old 10-24-2018, 03:50 AM   #26
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Question Will It Be Zinc or Pine-Needle "Chemistry"?

We have a shingle roof, and for 50+ years, no roof issues.

Out of concern for an "unsightly" layer of pine needles, a family member asked about sweeping them off.

"Knock yourself out", I said.

So for about ten years, the pine needles were regularly swept off.

Then I was asked, "Should I sweep the moss off the roof?

"Knock yourself out", I said.

Well, now the moss has grown over the edge of the roof, and caused what appears to be likely damage to the facia ["facing" boards]. (At 25 feet off the ground, something I'm not going to repair myself).

Can I make a case that this relatively new moss growth was inhibited by a thin—but constantly-changing—layer of pine needles?

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