Flooring insulation upgrade

[EdBob]

Hello fellow Jayco owners. I have a 2015 310w siesmic toy hauler. After discovering a leaking black water tank issue that has now been repaired, i am contemplating adding some R19 kraft paper batted insulation across the entire underbelly. I would think the kraft paper should be placed face down, then add the foil polymer wrap under that, then finally the black plastic protective barrier. Any thoughts or concerns on these ideas? Thanks....Ed

[motorbreath]

I have been thinking about insulating my TT for a while, I think it is definitely a good investment. Hopefully there someone out there with professional expertise who could speak-up, but I am planning to go with insulation that would be somewhat tolerant of moisture.

I think fiberglass insulation does not have much structure, so when it gets wet it can compress and reduce effectiveness. Lots of people here in Ontario get their undercarriage spray-foamed, but I am concerned about future repairs.

I think either foam board insulation or Roxul-type insulation (so-called stone wool). Roxul is made near where I live, so the prices is quite good, but it can be a bit expensive in the US.

Originally Posted by EdBob

Hello fellow Jayco owners. I have a 2015 310w siesmic toy hauler. After discovering a leaking black water tank issue that has now been repaired, i am contemplating adding some R19 kraft paper batted insulation across the entire underbelly. I would think the kraft paper should be placed face down, then add the foil polymer wrap under that, then finally the black plastic protective barrier. Any thoughts or concerns on these ideas? Thanks....Ed

[Irks73]

Someone mentioned having the underside spray foamed. I believe that's probably the best route.