In "Bob F"
wrote:

Bert Hyman wrote:

Other than trying to avoid turbines, does the style matter, so long
as they're big enough and there's enough of them?

I little oil or grease would probably extend their lives indefinately.

Maybe so, but

A) I don't do roofs.
B) I'm interested in hearing about the pros & cons of other styles

--
Bert Hyman St. Paul, MN