Sort of, it's common to mount metal roofs on wood. Leaves, pine cones, pine needles, and even just tree dandruf/pollen/cottonwood strands tend to collect in co

Sort of, it's common to mount metal roofs on wood. Leaves, pine cones, pine needles, and even just tree dandruf/pollen/cottonwood strands tend to collect in corners, in gutters, and any other ledges. Even an ounce can be enough to start a fire and embers from major fires can easily go a mile. So even a metal roof isn't good protection unless you remove anything that can ignite from anywhere near wood. Embers don't typically light asphalt shingles ... unless the fire gets under it on a gutter or similar.