Some really good thinking here! I just had another thought. What about glueing a layer of the Reflectix, the thin foil-backed insulation with foam in the middle, to the roof, then putting the fiberglass batt LOOSLY below that? Only problem is, I only have the center section open where the TV cabinet was, so can't glue it over the equipment cabinets on each side. Maybe the batt insulation would hold the Reflectix up close to the roof. What do ya'll think?
Joe & Annette
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD