Regardless of what you use for the headliner, this may be a good option to consider.
Rmax Plus-1 in. x 4 ft. x 8 ft. Polyisocyanurate Rigid Foam Insulation Board
I put this with the foil facing out and put the FRP over it. This is pretty easy to cut, and fit into all the rectangles of the ceiling supports.
You will probably need to shave off some of the original spray foam, but as you will find out that was by no means a perfect covering job when
originally applied. Its a bit more work but its worth it. I would not remove all the original foam up there, but just enough to slide the insulation
panels up there. Then go over all the seams with Aluminum Duct tape. Thats normally found in the instillation section pretty close. 7 bucks or so a
roll. This helps to seal up drafts and as a bonus what ever ceiling panel you go with will not have open cavities behind it.
I have found it keeps the coach a bit cooler when in the sun, and probably helps with some noise.
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77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
