Choreboy wrote:

Perhaps it damages cedar more.

Yeah, they really want the wood to be able to dry out. I'm replacing
some old plastic siding someone put on my house's Mansard roof before
we bought it. Using cedar shakes. It's slow going, just the two of us,
but we're getting there. Here is a pic:

http://home.comcast.net/~newspost/P1010011.JPG