Bob&Patty
Founders of SoCal Chapter
I used 2" foam insulation and the 1" foil on one side type. The 2" and 1" are the exact size of the aluminum beams. You can glue and screw them in place. JUST DONT USE TOOOO LONG OF SCREWS. I used construction adhesive. You can also drop the coroplast and do the same thing on any exposed wood under all the flooring. I doubled up in that area with the 2" foam. I personally am not a fan of the batting type of insulation in a 5er. If it gets wet....it is now useless. JMHO
