The Jayco website only says it's r24 bead-foam insulation in the roof. Sorry, I'm not of more help for your construction question. Perhaps members with that model of MH will come by with some more specifics for you.
If you're going to "regret it in the morning", sleep until noon.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley