1.5.zip May 2026

: A 1-inch thick layer of polyisocyanurate (polyiso) foam bonded to the back of the OSB.

, significantly lower than standard OSB and housewrap combinations ( 3. Advantages in Construction 1.5.zip

: It combines multiple steps (sheathing, WRB, and exterior insulation) into a single installation, which can be faster and cheaper than applying separate layers. : A 1-inch thick layer of polyisocyanurate (polyiso)

The 1.5-inch panel is a composite material consisting of three primary layers: The is a structural wood panel with integrated

: In Climate Zone 5, the R-6.6 provided by the 1.5-inch panel is sufficient to keep the sheathing boundary above the dew point, preventing internal condensation when using fiber insulation in the stud cavity. 4. Application and Code Compliance

: The overlay typically provides a permeance level of 12–16 perms , allowing the panels to "breathe" and dry out.

The is a structural wood panel with integrated water-resistive barrier (WRB), air barrier, and thermal insulation. The 1.5-inch variant is a specific configuration designed to provide a continuous thermal bridge break while maintaining structural integrity in residential and commercial framing. 2. Composition and Specifications