1.5.zip -

: 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

: The overlay typically provides a permeance level of 12–16 perms , allowing the panels to "breathe" and dry out. : A 1-inch thick layer of polyisocyanurate (polyiso)

Technical Analysis of 1.5-Inch ZIP System R-Sheathing in Modern Building Envelopes 1. Introduction Technical Analysis of 1

: 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 primary benefit of the 1.5-inch ZIP-R system is the elimination of . In traditional framing, wood studs act as thermal bridges, conducting heat out of the building. The 1.5-inch ZIP-R provides continuous insulation that can cut wall heat loss by 20–30% compared to cavity-only insulation. Other advantages include:

: A layer of high-quality OSB that provides shear strength.