Whether you’re looking for EPS, XPS or polyiso (polyisocyanurate), insulation r value per inch is an important criteria. At Universal Foam Products, we have our product datasheets online and we are just a phone call away with the rest of your insulation questions. With our EPS (expanded polystyrene) products – used to insulate walls, roofs, floors and under slab work, the R-value is consistent over time without degradation or movement of the insulating material. Call Universal Foam Products now at 410-498-0000 to make the decision on your insulation.