Mark, I checked out your link out on the standing seam. that is a new design that I am not familiar with. the one that I see here is a type that has two single edges that are bent over with a special pair of vise grips. The new design may be better and is much easier to install. I do not fool with any of it as you have to paint it sooner or later. How did you vent out your crawlspace or is it heated and cooled?
