[kach22i]

I'd be more tempted to use the clad sign material than simple aluminum because I don't want to hear every little stone kicked up to the underbelly.

NOTE: If anyone finds a house roof material that is metal on the outside and dampened on the underside (plastic/bituminous) let me know. I want a metal roof but have a large Black Walnut tree out front that drops these rock like projectiles (walnuts) for a month every fall.