Columbus's odd floor/roof R-values
We all know that RV insulation values are like wisps of smoke; the only thing helpful about that is that it makes relative comparisons easy, if all MFGs play the same game with the calculated R-value of radiant technology insulation, for example.
In the course of shopping, prior to my Columbus order, it was generally just a matter of a little digging to find out how the model came up with its advertised numbers; e.g., the Columbus big brother, Sanibel (which, I must admit, seems to be worth the extra money above a Columbus)---R-14 batten + R-38 radiant in the roof, to get to it's advertised R-52 roof value. Even Palomino Sabre Platinum, with radiant package option, tells you how the total R-value is calculated.
I've placed my Columbus order, so I'm past the fail-safe point, but I never did get an answer, nor could I figure out 2 things....1)Why Columbus seems to be alone (I shopped Keystone, FR, KZ, Jayco, Heartland) in having a (nominal, at least) higher floor than roof R-value, when it's commonly accepted than roof 'seepage' is 50%, floors 25%, and 2) What combination of batten, foam, or radiant make up the advertised R-30 roof/R-32 floor.
Did anyone ever find out?