Best Three Season Bottom Floor Insulation

On our previous TT, we had a leak under the bathroom sink which caused water to leak down under the TT, soaking the fiberglass insulation that the manufacturer used to insulate the underbelly. There was so much water that leaked under there that it also caused the black underbelly material to buldge. I had to make a slit in it to drain the water. After the water was drained, I hoped that the insulation would dry but after a week in 100 degree weather and two commercial fans blowing on it, it was still wet. I removed the black underbelly material and gutted all of the fiberglass out and installed OC Foamular Ridgid Foam Insulation It was alot of work cutting out the pieces (used my table saw to cut the Foamular) to exact size to fit between the floor joists but well worth it. Once I had the entire floor fitted and installed with the Foamular, I used CorPlast
and these fasteners to secure the CorPlast to the floor joists. Due to the lightweight of both the Foamular and CorPlast, I believe it actually lightened up our TT a bit.