Attics and walls where high R-value and fire resistance are needed. (Expanded Polystyrene) SilveRboard R10 Rigid Board Insulation Go to product viewer dialog for this item. Budget-friendly option for under-slab or general sheathing. Key Features to Consider
: XPS is highly moisture-resistant, making it the standard for below-grade or foundation use. where can i buy foam insulation board
: Websites like Insulation4US and Pexuniverse offer a wider range of densities and specific-use boards (e.g., under-slab or joist-specific). Attics and walls where high R-value and fire
: If you are installing under a concrete slab, look for a high PSI rating (e.g., 25–40 PSI) like the SilveRboard HD to prevent crushing. while unfaced boards are more breathable.
: Foil-faced boards (common in Polyiso) act as a radiant barrier and vapor retarder, while unfaced boards are more breathable.