Originally Posted by thiggins
I'd be so tempted to put some spray foam in there...yup...
Ah, there is term "unintended consequences" and I'd be very careful about putting foam in this area. As it expands it exerts force on whatever's containing it. Not a lot, but some. There's a possibility that it would produce enough force to distort both the external trailer side and the bathroom wall.
Yes, that's good old reflectix. Gen 1 trailers have that as their insulation. I thought that Gen 2 used a foam rubber type. Maybe reflectix is used in this area because there's not vinyl surface area, it's in an enclosed space.