Insulation

DuPont™ Styrofoam™ Brand Ultra SL XPS Insulation

High R-Value, Moisture-Resistant Insulation with Shiplap Edges

U.S. HFC Compliant Formulation

DuPont™ Styrofoam™ Brand Ultra SL Extruded Polystyrene (XPS) 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 XPS 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 with shiplap edges maximizes the performance of the entire wall assembly.

Styrofoam™ Brand Ultra SL XPS Insulation — when tested with LiquidArmor™ Flashing & Sealant over joints, penetrations and transitions — complies with ASTM E2357 Assembly Air Barrier tests. It is also an approved air barrier assembly by the Air Barrier Association of America (ABAA) and passes ASTM E331 Water Penetration and ASTM E2178 Air Permeance testing.

Specifications

Standard Sizes

Thickness	Width	Length	R-Value	Edge Treatment
2.18 in.	4 ft.	8 ft.	12.2	8 ft. Shiplap
2.5 in.	4 ft.	8 ft.	14	8 ft. Shiplap
3 in.	4 ft.	8 ft.	16.8	8 ft. Shiplap

Note: Styrofoam^™ Brand Ultra SL is commonly used in masonry applications over steel stud or CMU back up, where it does not have to be cut to 16" widths to allow for masonry ties.Note: Please be advised that additional sizes may be available. Availability of all sizes varies by region and is subject to change. For further information, please contact your local DuPont Sales Representative or call us at 1-866-338-7668.

Testing

Styrofoam^™ Brand Ultra SL XPS Insulation exhibits physical properties as indicated in the table below when tested as represented. Review all instructions and (Material) Safety Data Sheet ((M)SDS) before use. Please contact DuPont at 1-833-338-7668 when additional guidance is required for writing specifications that include this product.

TEST METHOD	TEST TITLE	PROPERTY	RESULTS
FIRE
UL 723	Test Method for Surface Burning Characteristics of Building Materials	Surface Burning Characteristics	Flame Spread ≤ 25 Smoke Developed ≤ 450
THERMAL
ASTM C518	Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus	Thermal Resistance R-value per in., min¹	5.6 ft² •h•°F/Btu, R-value, min.
ASTM D696	Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics Between −30°C and + 30°C with a Vitreous Silica Dilatometer	Coefficient of Linear Thermal Expansion	3.5 x 10-5 in/in•°F
ASTM D2126	Standard Test Method for Response of Rigid Cellular Plastics to Thermal and Humid Aging	Change in Dimensions	2.0% change, max.
STRENGTH
ASTM D1621	Standard Test Method for Compressive Properties of Rigid Cellular Plastics	Compressive Strength²	25 psi, min.
ASTM C203	Standard Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation	Flexural Strength (psi)	50 psi, min.
WATER
ASTM C272	Standard Test Method for Water Absorption of Core Materials for Sandwich Construction	Water Absorption	0.3% by volume, max.
ASTM E96	Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials	Water Vapor Permeance³	1.5 perm, max.

¹Values are consistent with the criteria of ASTM C578 and the requirements of the FTC R-value rule (16 CFR Part 460). R means resistance to heat flow. The higher the R-value, the greater the insulating power.

²Vertical compressive strength is measured at 10 percent deformation or at 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.

³Based on 1” thickness.