Best Three Season Bottom Floor Insulation

spike99 wrote:


I still don't understand why some folks don't like Spray Foam (CC - contractor grade) under their RV/TT. I applied under my RV/TT and its amazing stuff. And, it isn't too much work to install.

After seeing benefits of before and after with my own eyes, IM RV/TTs should use Foam (spray or vacuum bonded) as minimum factory build.

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I think some are worried about moisture being held against the bottom of the subfloor and what would happen in the future if needing access to the underbelly. I believe these are both false issues. As you've outlined in your posts, a bit of prep is what's needed for future access or repair and the moisture issue is just not there. If anything, the foam should keep the floor decking drier than without. My rig has a continuous aluminum sheet under the flooring system and, when I pulled up the original plywood floor decking, the underside was like new. So much for moisture entrapment, not an issue.

Agreed, also, some type of foam should be factory standard. I've done this job on a couple of older trailers and the results are dramatic. Heating a trailer is tough enough with the heat loss from windows, doors, and the minimal wall cavities. Having a cold floor is the worst for keeping comfortable.