Well, after taking the vent piece off and having a look inside the ducting, think I see what the problem is. Just gotta say this right off the bat: this is another example that shows just how shoddy this motorhome was built, haha. I am NOT impressed with how it’s built, has me seriously thinking about trading it for a quality built unit like a Newmar.
Anyway, the roof consists of a thin layer of some kind of plywood, then about 1” of solid styrofoam insulation. There is some kind of paper material glued down to the styrofoam insulation, then the duct cavity. Right there at the duct opening, that paper has come unglued from the styrofoam quite a bit, allowing air to get in between the paper and styrofoam where it ain’t supposed to get. Air blowing up into that styrofoam is blasting little bits of the styrofoam out. The duct opening we saw the most coming out, is where the paper has come up the most, but it looks like its happening at the other duct openings, too.
Sooo, how to fix this is the question now. Thinking about using some foil tape at each duct opening, and tape that paper back down all around it, to keep air from blowing up into the insulation. That, or maybe trying to glue that paper material back down around the duct opening with some kind of glue.
Thoughts?
