Prior to reroofing we took down all the old insulation in our attic that was wet. Now we need to reinsulate. Can foam insulation or radiant barrier insulation be used in place of fiberglass? There is no finished ceiling just the wood beams cross boards and back of the roof tiles. We'll be doing this ourselves and prefer not to work with fiberglass. Looking for a product with a high RValue so the heating doesn't go out the roof.