What’s the difference between ProPink® and FOAMULAR® rigid insulations?
Tom writes from Ashland, Massachusetts: “First, what’s the difference between ProPink and FoamulaR rigid insulations? Second, I have searched and found contradicting replies from this blog on installing rigid foam insulation on the exterior of a home that has interior fiberglass batts with a vapor barrier. Since the perm rating of your rigid insul is 1.1 it is practically a vapor barrier. Now if the rigid insul is installed on a home with an interior vapor barrier then does that not sandwich the walls between the 2 barriers? Could this 2 barrier system lead to problems with trapped moisture? I always thought Your Fan Fold insul was perforated with holes to solve the above mentioned problem. Through the tiny holes punched in the rigid insul water vapor would escape and yet most heat would be trapped.” Answer: PROPINK® insulating sheathing has a film facing. It is a FOAMULAR® brand insulating product that is made with extruded polystyrene. The facing is the key difference in the PROPINK