I am about to have my roof replaced next month. I was talking about it with a co-worker and they asked if they were going to be putting strips down above the solid decking before the metal roof went down and I told him no. He mentioned something about this always being the mistake that people make when installing a metal roof by not putting the strips to allow an air gap.

As it stands, my roof will be stripped down to the 1 x's that are on top of my rafters. Solid decking plywood will be installed, then it will be water-proofed, then the metal roof goes down.

Any comments or suggestions?