As we said before, the R-value measures the thermal resistance of a material. This highly effective combination of materials offers a higher R-value per inch compared to traditional flat-sheet insulation as well as provides built-in moisture and air barriers which … Continued This highly effective combination of materials offers high compressive strength and great thermal performance when used in below grade and under slab applications. Why GPS is Best in Class Insulation Source: ASTM C1512 Intertek Testing Services NA Ltd. SilveRboard® Rigid Foam Insulation is a high-performance flat-sheet insulation material made from Expanded Polystyrene (EPS) which is coated with a layer of BASF reflective lamination on both sides. Factoring in the effect of all that lower R-value wood in a standard 2x4 wall (16" on center), the whole-wall R-value is about R-11, so that's our starting point. R-Panel is manufactured with a closed-cell polyisocyanurate foam core bonded to fiberglass-reinforced facers and designed for use over metal, nailable and non-nailable roof decks with a variety of membrane systems. From what’s I’ve understood XPS outgasses and it’s R-value drops to that of EPS over time. 1- Per BSAF, 1#/cu.ft. Versatility. Often a flame war it seem. Although the nominal R-value of polyiso is the highest of the three major types of rigid foam, its cold weather performance is lower: As the temperature drops, so does the R-value. Shop SilveRboard R-5 1-in x 4-ft x 10-ft SilveRboard acoustic Faced Polystyrene Foam Board Insulation with Sound Barrier in the Foam Board Insulation department at Lowe's.com. 2- The exact opposite is true for polyiso. R-value Units. Polyiso can’t be used under grade. SilveRboard Rigid Foam Insulation is a high performance flat-sheet insulation material made from Expanded Polystyrene (EPS) which is coated with a layer reflective lamination on both sides. If you're framing with 2x4s, you could go with a higher density insulation and get R-13 in the same space. The R Value goes up as the temperature drops. The floor is likely to cold to put polyiso on top of it. R-values are additive. 0.625-in x 48-in x 96-in SBGXS type1 R3 SilveRboard graphite radiant sheathing; SilveRboard graphite radiant sheathing meets not only the demands of the job site toughness but new 2016-17 codes both for R value and low air permeance (for external air barriers) with or without OSB sheathing Insulation's R-value is a measure of its effectiveness, and a single 1-inch sheet of polyurethane foam gives you an R-value of 5.5 to 6.5, according to the U.S. Department of Energy. Also it is much more expensive. eps has an r value of 3.85 AT 75 degrees F. Important for people living in the north, such as Minnesota, is that the r value at 0 degrees F is 4.55. SilveRboard® is a rigid insulation board made from Expanded Polystyrene (EPS) covered with a layer of polypropylene reflective lamination on both sides. I’m aware the exact R-value are a big debate. Performance. Johns Manville R-Panel ® rigid roof insulation board offers R-Values of up to R-23.6, providing high thermal efficiency. Some builders working in cold climates give it an R-value of 4.5 or 5 … SilveRboard acoustic is a do-it-yourself (DIY) nonstructural, rigid insulation board made from closed cell … Sustainability. Expanded Polystyrene Because it’s old reclaimed material I use an R-value of 5. R-value loss for XPS insulation is directly related to the % of water absorption by volume XPS, Type X, 1.60 lb/ft3 GPS, Type I, 1.0 lb/ft3 Why GPS is Best in Class Insulation EPS, Type I, 1.0 lb/ft3 . 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