I think that means all the framing above the floor is aluminum. On our coach, the basement framing is steel, then there is a wood floor (2x framing with fiberglass batt insulation similar to a house) then the framing above the floor is all aluminum including the roof.
Stewart
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Stewart, Brenda and kids
2008 Newmar Canyon Star 3410, now at a new home
2006 Roadtrek Versatile 210
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