Steven writes from Berlin, Maryland: "We are remodeling a stick built building it has 2x4 R-11 in walls 3/4 plywood sheathing we are furring the outside and using foil faced foam board between then house wrap. Does this sound correct, does the foil go in or out in this application?"

Answer: Owens Corning does not make FOAMULAR® insulation with a foil facing so I am guessing you have a competitive product. I recommend contacting the manufacturer of the product for answers to your questions.