LIT 1027 (R-10 Comparison) 090414®
®
LIT 1027 Rev 09-04-2014
X-Grade®
Property and Test Method Dow
Styrofoam®
Owens Corning
Foamular®
Atlas
X-Grade®
Thermal Resistance ASTM C518
75 F mean temp. ft2.h.F/Btu, R value, min. R10 min. 2" R10 2" R10 2-3/8" R10
Compressive Strength, ASTM D1621 psi, min. 25 psi 25 psi 25 psi
Flexural Strength ASTM C203 psi, min. per ASTM C578 50 50 50
Water Absorption ASTM C272 % by volume, max. 0.3 0.1 1.25
Water Vapor Permeance, ASTM E96, at R10 thickness 0.7 0.5 1.5
Long-term Maximum Use Temp °F, max. 165F 165F 165F
Water Affinity Hydrophobic Hydrophobic Hydrophobic
Preserved Against Termite Degradation per Code
Requirements in SC, GA, FL, AL, MS, LA, TX & CA ڟ Not available Not available Standard
Gas Inside Insulating Cells (per MSDS)
Tetrafluoro-
ethane (HFC
134a)
Proprietary Blend/
HCFC 142b Air
Surface Burning Characteristics ASTM E84
Flame Spread <25* <25* <25*
Smoke Developed <450** <450** <450**
ASTM C578 TYPE IV IV II
Alternate 15 psi compressive ASTM C578 TYPE X Y II
Global Warming Potential (GWP)
relative measure of how much heat a greenhouse gas traps in the
atmosphere
1430 500 0
Ozone Depletion Potential 0 0 0
*Code requires flame spread rating of 75 maximum **Code requires smoke development rating of 450 maximum
ڟ IBC 2603.9, IRC R318.4 requires foam plastic below grade or under slab be protected from termite attack in very heavy infestation areas
STYOFOAM is a registered trademark of The Dow Chemical Company and FOAMULAR is a registered
trademark of Owens Corning Intellectual Capital, LLC.
ATLAS, the Globe Logo, Solutions. Delivered., the color Pale Creamy Orange, ThermalStar and X-Grade
are registered trademarks of Atlas Roofing Corporation
Atlas EPS, a Division of Atlas Roofing Corporation
8240 Byron Center Ave SW, Byron Center, MI 49315 (800) 917-9138 www.atlaseps.com
Specifier Summary: Specifier Summary: Specifier Summary:
More breathableMore breathableMore breathable
Termite resistantTermite resistantTermite resistant
Insulating cells contain air, with Insulating cells contain air, with Insulating cells contain air, with
0 global warming potential0 global warming potential0 global warming potential
Perimeter & Below Grade
Rigid Polystyrene Insulation R-10 Comparison