Jennifer writes again from Saginaw, Michigan: "It has a flat metal roof and no attic access. We found something called Iso-board. Do you have anything like that?"

Answer: Owens Corning manufactures FOAMULAR™ extruded polystyrene insulation. This is a PINK rigid foam board product that provides an R-value of five per inch. Among the major benefits of the product are compressive strength and resistance to moisture. The term you heard is probably shorthand for polyisocyanurate, another type of insulation that Owens Corning does not make. I recommend contacting a contractor to find out if FOAMULAR insulation is suitable for your particular application. If you want to learn more about FOAMULAR insulation online, you can find it on the Owens Corning website.