Dusty writes from Lewistown, Pennsylvania: "If we use polyisocyanurate insulation in our attic do we have to cover it? We were hoping to be able to just paint over it. Because of the area that is why we wanted to use some type of foam board insulation."

Answer: Owens Corning no longer manufactures a polyisocyanurate insulation so I can't help with that question. You could use FOAMULAR® insulation but you will have to get an OK from your local building inspector to leave it exposed.