I've had plenty of times with the Espar where I'd pull the window coverings off and have lots of condensation (or when especially cold outside, ice) on the windows. I have the van well insulated with board and canned foam, all covered up with Reflectix and the seams covered with silver foil tape.
When I initially insulated the Sprinter I did not insulate the roof slope above my head, and then I noticed the headliner was getting water stained a little bit and sometimes I'd have water dripping down from the dome light. I figured, "well that can't be good."
I pulled the headliner and 3M Spray Glued some Reflectix over every inch of the metal, sealed all the seams and edges with foil tape, and haven't had any condensation problems up there since.
When I initially insulated the Sprinter I did not insulate the roof slope above my head, and then I noticed the headliner was getting water stained a little bit and sometimes I'd have water dripping down from the dome light. I figured, "well that can't be good."
I pulled the headliner and 3M Spray Glued some Reflectix over every inch of the metal, sealed all the seams and edges with foil tape, and haven't had any condensation problems up there since.