I have a 24x30 pole barn,I have put foam board insulation on the walls and plywood over it.I was going to close of the ceiling and put insulation above it,but I really like the storage it offers me.Is there a way I can insulate just below the metal roof with foam board or another type of insulation? Also the roof has a ridge and soffit vents would these need to be closed off? I will be using a radiant tube heater...thanks..ED