2" 4x8 POLYISO FOIL SHEET R13

2" Polyiso R-13 Foil-Faced Rigid Foam Insulation (4' x 8' Sheet)

Maximize your thermal efficiency with our 2-inch Polyiso Rigid Foam Insulation. Engineered for high-performance building envelopes, these 4x8 sheets deliver an impressive R-13.1 insulation value, making them one of the most thermally efficient products available per inch of thickness.

Featuring a durable, reflective foil facer on both sides, this board acts as a potent radiant barrier in addition to traditional conduction resistance. It’s the professional choice for reducing energy costs in residential, commercial, and industrial applications.

Key Features

Superior R-Value: Delivers a high thermal resistance of R-13 in just a 2-inch profile.

Dual-Sided Foil Facer: Reflects radiant heat and provides an excellent moisture/vapor barrier when seams are taped.

Dimensional Stability: High compressive strength ensures the boards won't shrink, sag, or lose R-value over time.

Versatile Application: Ideal for interior walls, vaulted ceilings, crawl spaces, and exterior continuous insulation (CI) behind siding.

Easy Installation: Lightweight and easy to cut with a simple utility knife or saw.

Specifications

Why Choose Polyiso?

Unlike standard EPS or XPS (Styrofoam), Polyiso is manufactured using a unique blowing agent that creates a denser, higher-performing cell structure. It is CFC/HCFC-free, has zero ozone depletion potential, and is widely recognized as the gold standard for continuous insulation in energy-efficient "Passive House" or LEED-certified builds.

Pro Tip: For the ultimate air seal, use high-quality foil tape on all butt joints to create a continuous vapor barrier and eliminate air leakage.