Thanks for the info. I'll do more research and check out the foil radiant barrier before proceeding with project.

The trusses are 2X2 and I'm not sure what kind as you asked . The room is 16 X 22. I could take a picture and send you so you can better determine what I should do. Would like to replace the sheetrock with something more lasting and maintenance free.
Thanks

Need to replace cathedral ceiling due to a mold problem after losing part of roof in hurricane. Replaced the metal roof right away, but did not replace insulation. Home is a 1996 Southern Energy dw with the cathedral ceiling in living room. Also that room is the hottest in the house with hot air bei...