Adding insulation WITHOUT tearing up the rig??

wowens79 wrote:
This may seem minor, but put some 3" foam in any skylight, or vent fan openings. It really made a difference in our camper in the bathroom.

I was just looking into that- the bathroom skylight is the larger "bump up" type and I wanted to cover that, but wasn't sure what to use that would not get mildewy from showers.

And the skylight in the bunkroom needs covering. I know they sell inserts for just that. But what type of foam do you use and where do you get yours? Thanks!