Q Cabin  claims: 'Q Cabin Kits are the standard in sustainable, disaster-resistant housing.'
'The Q Cabin Kits have been approved in California’s most strict Wildfire areas. We use 2×6 steel studs and track, 2×12 steel floor joists and 18 gauge Quonset material with a 50-year warranty.
(Q Cabin Kits, Chico, California) >

http://theqcabin.com/