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?
.