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. 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 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 . Often a flame war it seem. 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 1- Per BSAF, 1#/cu.ft. R-value Units. R-values are additive. Sustainability. The R Value goes up as the temperature drops. SilveRboard® is a rigid insulation board made from Expanded Polystyrene (EPS) covered with a layer of polypropylene reflective lamination on both sides. As we said before, the R-value measures the thermal resistance of a material. From what’s I’ve understood XPS outgasses and it’s R-value drops to that of EPS over time. Why GPS is Best in Class Insulation Source: ASTM C1512 Intertek Testing Services NA Ltd. Also it is much more expensive. 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. 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. 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. 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. Expanded Polystyrene 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 … 2- The exact opposite is true for polyiso. Performance. Because it’s old reclaimed material I use an R-value of 5. 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. SilveRboard acoustic is a do-it-yourself (DIY) nonstructural, rigid insulation board made from closed cell … For instance if you have a material with an R-value of 12 attached to another material with an R-value of 3, then both materials combined have an R-value of 15. Polyiso can’t be used under grade. I’m aware the exact R-value are a big debate. If you're framing with 2x4s, you could go with a higher density insulation and get R-13 in the same space. 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. The floor is likely to cold to put polyiso on top of it. Versatility. 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. 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