(what are the risks of using aluminium as vehicle roof design)?
Aluminum expands at a far greater (and faster) rate than steelJoining it and keeping it joined is possible, as is making it strongProblem is, the only places this is profitable is on airliners If you look at something at least SOME people have a hope to own, it's aluminum skinned trailersNot airstreams as they are a bit different, but the regular rectangular shaped onesOver time they develop leaks because keeping seams sealed when expansion is that rapid and extreme is difficultAdditionally, a roof is exposed to high UV loading, which exacerbates the problem with sealants and expansion/contractionIt is one reason the majority (if not all) of metal roofing material is steel, not aluminum.
