Bingo on the Mennonite or Amish work crew, that's common here too. If we do
it ourselves, we borrow or rent one of those large forklift/tractors with
the extendable boom. If you nail the steel on yourself, nail it on the rib
and not in the valleys, remember that the steel will expand and shrink. If
the nail is in the valley it will pop or shear the head off the nail or pull
it slightly out of the wood and then you've got a lot of leaks. Also use
neopream washered stainless or galvanized ring shank nails. Snap a line on
the outside of the steel to identify where your backing is to prevent
unwanted extra nail holes. A slide hammer welded to a set of visegrips or
horse hoof trimmers make a great set of nail pullers that won't leave tool
marks in the steel.

Jim