3" 4x8 POLYISO FOIL SHEET R19.5
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Enhance your building's thermal performance with our 3-inch R-19.5 Polyisocyanurate (Polyiso) Rigid Foam Insulation. This high-efficiency board features a closed-cell foam core sandwiched between two radiant-barrier foil facers, providing a superior thermal break for residential and commercial projects.
Key Specifications
| Feature | Details |
|---|---|
| Dimensions | 3" x 4' x 8' (96" x 48") |
| R-Value | R-19.5 (High thermal resistance per inch) |
| Material | Closed-cell Polyisocyanurate |
| Facing | Dual-sided reflective aluminum foil |
| Edge Profile | Square Edge |
Why Choose 3" Polyiso?
Maximum Efficiency: At R-19.5, this board provides one of the highest R-values available for its thickness, allowing you to meet strict energy codes without adding excessive bulk to your walls or roof.
Radiant Barrier: The reflective foil facers block up to 97% of radiant heat transfer when installed with an air gap, keeping interiors cooler in the summer and warmer in the winter.
Moisture Resistance: The closed-cell structure is naturally water-resistant and acts as a vapor retarder when seams are sealed with high-quality foil tape.
Versatile Application: Ideal for masonry cavity walls, framed walls, vaulted ceilings, crawl spaces, and commercial roofing systems.
Installation Benefits
Lightweight: Easy to handle, cut with a utility knife, and install by a single person.
Dimensional Stability: Unlike some foam products, Polyiso maintains its shape and performance over time.
Fire Performance: Polyiso is a thermoset material that performs better under fire exposure tests than many other foam plastics.
Pro Tip: To achieve the full R-19.5 rating and ensure a continuous air barrier, use 3" foil insulation tape on all joints and seams.