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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 where can i buy foam insulation board
: 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. If you'd like to find the best price
: Polyiso typically offers the highest R-value per inch (approx. R-6.0), followed by XPS (R-5.0), and EPS (R-3.6 to R-4.2). Moisture Resistance Budget-friendly option for under-slab or general sheathing
: Suppliers like Woodland Building Supply or Arnold Lumber often stock specialized professional-grade materials. Popular Products by Type The "best" board depends on where you are installing it. Recommended Product Best Use Case XPS (Extruded Polystyrene) Owens Corning FOAMULAR NGX F-150 Go to product viewer dialog for this item. Basements, exterior sheathing, and moist environments. Polyiso (Polyisocyanurate) Johns Manville AP Foil Faced Polyiso Go to product viewer dialog for this item.
: XPS is highly moisture-resistant, making it the standard for below-grade or foundation use.
📍 : Many large retailers offer "Buy Online, Pick Up In-Store" options which can save you significant delivery fees on bulky 4' x 8' sheets.