XPS vs. Mineral Wool: Better performance, with a thinner profile
Mineral wool and XPS foam – what’s the difference?
Mineral wool is fibrous, compressible, starts off with a lower R-value than XPS and absorbs water readily, making it a poor choice for commercial and residential below-grade applications. Styrofoam™ Brand XPS Insulation delivers a layer of continuous insulation around foundations and slabs, protecting buildings and homes from energy loss and moisture intrusion1 .
Moisture
XPS structure absorbs significantly less water than mineral wool products in a testing environment and in the field
R-Value
XPS has a higher R-value per inch than mineral wool and remains high at lower temperatures
Compressive Strength
Mineral wool is easily compressed, losing R-value; XPS rigid foam is reliable and dimensionally stable under load
A unique closed-cell structure gives Styrofoam™ Brand XPS its exceptional moisture resistance and enables it to retain a high, long-term R-value of R-5 per inch – even after exposure to standing water, wet soil and other damp conditions
Additional performance attributes of Styrofoam™ Brand XPS include:
- Meets ASTM C578 Types and CAN/ULC-S701.1 (refer to specific product information for details)
- Compliant with IRC, IBC and IECC as listed in ICC Evaluated Service Reports; compliant with NBCC
- Provides a weather-resistant barrier to enhance the building’s resistance to air and moisture penetration
- Meets building code requirements of ASTM E84 Flame Spread Index of 25 or less and a Smoke Developed Rating of 450 or less
- Will not corrode, rot or support mold growth
- Available in wide range of compressive strengths from 15 to 100 psi, and minimum flexural strength of 40 psi
- Is easy to fabricate into various sizes, thicknesses and edge treatments to meet specific design needs, while ensuring energy efficiency and minimizing on-site cutting and waste
Less Styrofoam™ Brand XPS is required
to achieve the same 30 R-value.
DuPont™ Styrofoam™ Brand XPS products are backed by the expertise of building science leaders dedicated to your success and warranties from a name you trust, including limited thermal warranties from 15 to 50 years including the Wall² system warranties and other system warranties.
Any questions?
The Styrofoam™ Brand was the original XPS, creating the product segment. Rooted in 80+ years of technical innovation, we’re excited to deliver a low-GWP solution. Let’s start a conversation about your next project.
Resources
Styrofoam™ Brand XPS Compliance Letter
Low GWP Grey Styrofoam™ Brand XPS EPD
(as sold in Canada and non-HFC regulated states)
Physical Property Equivalency Letter
Customer Processing and Transport Safe Handling
Safe Processing & Handling Graphic
Styrofoam™ Brand Product Brochure
Solar Exposure Technical Bulletin
Press Releases
September 9, 2024
English press release →
November 30, 2023
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June 8, 2023
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June 6, 2023
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July 26, 2021
English press release →
February 23, 2021
English press release →
August 13, 2020
English press release →
French PDF ↓
July 16, 2020
English press release →
French PDF ↓
Styrofoam™️ Brand Low GWP XPS LEED Optimization Document - Embodied Carbon Assessment
1 J. M. Knorowski and R. A. Cyphers, “Comparative Analysis of Thermal Insulation Performance When Subjected to Various Levels of Moisture,” in Performance, Properties, and Resiliency of Thermal Insulations, ed. D. Fisler and M. Pazera (West Conshohocken, PA: ASTM International, 2021), 60–75. http://doi.org/10.1520/STP1629202000362" /
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