My house in PA had cedar shakes on it for 30 years. I put each one on
myself when I was a kid. When we took them off in 2003 - except for the
weathered color - they were just as good as when I put them on. Also the
galvanized nails I used to mount them were still solid. There was lots
of evidence of insect life under the shingles - old nests - piles of
debris.

Harry