My roof is 1/2 particle board, but my rafters are on 16" centers, and I walk carefully the little time I'm up there. If I would have sheeted it myself I would use 1/2 inch plywood with a 1 x 4 down the center for a crown, then plywood strips out further for support.
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2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio
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