Commercial | Residential | Multifamily | Wall
Thermal performance for lasting efficiency
Durable and moisture resistant, Styrofoam™ Brand Ultra SL Extruded Polystyrene Foam Insulation provides continuous insulation as part of a complete 4-in-1 wall system.
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Styrofoam™ Brand Ultra SL
Styrofoam™ Brand Ultra SL Extruded Polystyrene Foam Insulation is a moisture-resistant, durable and lightweight extruded polystyrene foam board with shiplap edges designed specifically to be used as a continuous insulation (ci) and installed over block, concrete or metal stud backup behind masonry or stone veneers. Manufactured with a patented carbon-black technology, Styrofoam™ Brand Ultra SL Insulation features an R-value of 5.6 per inch (RSI of 0.97 per 25 mm), the highest of all extruded polystyrene foam insulation products. With its closed-cell structure offering advanced long-term thermal performance and moisture control, Styrofoam™ Brand Ultra SL Insulation with shiplap edges maximizes the performance of the entire wall assembly.
Features & benefits
| Lockable edges speed installation |
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| Moisture Resistant |
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Physical Properties
| Method | Unit | Value | |
|---|---|---|---|
| Thermal Resistance per inch @ 75°F mean temp.1.75” 2.125” 2.5” 3.0”<sup>1</sup> | ASTM C518 (ASTM-54) | ft.²•h•°F/Btu. R-value, min. | 10 |
| -<sup></sup> | - (ASTM-2) | - | 16.8 |
| Compressive Strength (PPSH-57)<sup>2</sup> | ASTM D1621 (ASTM-65) | psi, min. | 25 |
| Water Absorption (PPSH-277)<sup></sup> | ASTM C272 | % by volume, max. | 0.3 |
| Water Vapor Permeance 1.75” 2.125” 2.5” 3.0”<sup>3</sup> | ASTM E96 | perm, max | 1.1 |
1This numerical flame spread rating is not intended to reflect hazards presented by this or any other material under actual fire conditions.
2Vertical compressive strength is measured at 10 percent deformation or yield, whichever occurs first. Since Styrofoam™ Brand Extruded Polystyrene Foam Insulations are visco-elastic materials, adequate design safety factors should be used to prevent long-term creep and fatigue deformation. For static loads, 3:1 is suggested. For dynamic loads, 5:1 is suggested. Contact DuPont for design recommendations.
3This numerical flame spread rating is not intended to reflect hazards presented by this or any other material under actual fire conditions.
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