Spray foam insulation
Has anyone used spray foam insulation on the underbelly of their fifth wheel or have any opinion on using this for insulation? Last year, somehow the insulation in the underbelly of my fifth wheel bec...
Forum Discussion
StirCrazy wrote:pianotuna wrote:
be sure to use closed cell foam.
I would cut foam boards to below size and spray foam the edges.
I'm not sure I would use closed cell. it does have a higher insulation rating, but it is not flexible at all and if you have a leak it wont let water thru.
open cell is still r3.4/in it is flexible so wont crack in a application prone to movement, and will allow water to slowly drain if you have a leak.
Steve
If you use open cell the insulation may become saturated with water. Then when it freezes and thaws may have a right mess, including such desirable items as black mold.
