Lexar X Plus is engineered for extra strength and top-tier thermal performance in demanding applications. Its dual durable film facers enhance surface toughness and enable use as an air and water-resistive barrier (WRB). Made with 100% virgin EPS, it’s ideal for wall assemblies requiring high compressive strength. Lexar X Plus is engineered for extra strength and top-tier thermal performance in demanding environments. Lexar X Plus features a laminated film facer and functions as an air and water-resistive barrier (WRB). Lexar X Plus meets ASTM C578 and is manufactured under an industry-leading quality control program monitored by UL and ICC-ES. It offers a stable lifetime R-value, a range of available high strengths, and outstanding moisture resistance. Manufactured with a low Global Warming Potential (GWP) and Zero Ozone Depletions Potential (ODP), Lexar X Plus has earned GreenGuard certification.
Primary uses include wall and below-grade applications where thermal performance and moisture resistance are critical. Available with TalonGuard resistance
Product Highlights
- Foam Core 100% Recyclable
- Multiple Thicknesses
- Long-term stable R-value
- Compressive strength: 15, 25, 40, and 60 psi
- Limited lifetime warranty for physical and thermal performance
- Flat 4’x8′ sheets, standard sizes up to 4″ thick, custom sizes up to 24″ thick
Code Compliance
Lexar X Plus is recognized for compliance with the following standards and code:
- ASTM C578
- ASTM E84/UL723
- NFPA 285 Assemblies
- IBC – International Building Code
- IRC – International Residential Code
- IECC – International Energy Code
See UL Listings, UL ER16529-01, and ICC-ES ESR-1962
Warranty

Lexar X Plus is backed by a limited lifetime warranty for physical and thermal performance, in addition to termite resistance when applicable. See separate Lexar warranty for terms and conditions.

