That is thin in my opinion. I believe there is a requirement for cetificated aircraft, that the fuselage behind the firewall, (boot cowl) for 18", also be metal covered. I will be doing this. I found beautiful sheet stainless at a local HVAC shop. This metal is usually sold by the pound. It was a company that specialized in large buildings, so they custom fabbed a lot of ducting. They also had 12 FOOT long bending brakes, and said I was welcome to bring work in. Have you checked AC 43.13? I keep my copy out in the shop, not by the computer, or I would've looked it up for you. dale matthew wise wrote: > FlyBaby > > Will be wrapping the firewall soon with galvanized, > .018" most likely. Is there any other fire retardent > material required, or recommended, between the > galvanized and plywood or will just the metal suffice? > > Matt Wise