DuPont™ Styrofoam™ Brand Square Edge XPS Insulation

Water-Resistant Insulation for Attics, Foundations, Conventional Roofs and Crawl Spaces U.S. HFC Regulation

DuPont™ Styrofoam™ Brand Square Edge XPS Insulation

Water-Resistant Insulation for Attics, Foundations, Conventional Roofs and Crawl Spaces U.S. HFC Regulation

DuPont™ Styrofoam™ Brand Square Edge Extruded Polystyrene (XPS) Insulation is a grey, extruded polystyrene foam (XPS) insulation board that provides continuous insulation over steel stud or wood framing, in masonry unit cavity walls, conventional roofs and meets the needs of the commercial foundation and building floor slab needs. It can also be used for attics, foundations/slabs and crawl spaces in residential applications. With more than 60 years of proven performance in wet environments, the closed-cell structure of Styrofoam™ Brand Square Edge XPS Insulation resists water pickup, enabling it to retain a high R-value over time – a necessary property in wet, below-grade commercial foundation and commercial roofing applications. Styrofoam™ Brand Square Edge XPS Insulation is classified as a Type IV product when tested in accordance with ASTM C578 and provides a long term insulating performance of R-5 per inch.

Resources

Product Information Sheets Installation Guides Brochure

Features & Benefits

Ease of Installation

Easy to handle, cut using a utility knife or serrated blade, and install.
Comes in a wide selection of sizes and thicknesses.
Designed to help ensure energy efficiency and minimize on-site cutting and waste.
Provides a secondary barrier against groundwater leakage.
Helps protect foundation damp proofing and waterproofing, especially during backfilling.
Minimizes the freeze-thaw cycling of the foundation, reducing the potential for cracking.
Warms the foundation, reducing the potential for condensation.
Will not corrode, rot or support mold growth.

High Performance Durability

Provides a weather resistant barrier to enhance the building’s resistance to air and moisture penetration.
Resistant to degradation from soil components and will retain insulating performance characteristics after prolonged exposure to moisture.
Has a minimum compressive strength of 25 psi and a flexural strength of 50 psi.
Can be used in a number of applications like sheathing, foundation walls, masonry cavity walls, and more.

Specifications

Standard Sizes

Thickness	Width	Length	R-Value	Edge Treatment
1.0 in.	4 ft.	8 ft.	5	Square Edge
1 1/2 in.	4 ft.	8 ft.	7.5	Square Edge
2 in.	4 ft.	8 ft.	10	Square Edge
2.5 in.	4 ft.	8 ft.	12.5	Square Edge
3 in.	4 ft.	8 ft.	15	Square Edge
4.0 in.	4 ft.	8 ft.	20	Square Edge

Testing

Styrofoam™ Brand Square Edge XPS Insulation exhibits the properties and characteristics 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 per inch @ 75°F mean temp¹	5.0 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	50 psi, min.
WATER
ASTM C272	Standard Test Method for Water Absorption of Core Materials for Sandwich Construction	Water Absorption	0.1% 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.