: 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
: A 1-inch thick layer of polyisocyanurate (polyiso) foam bonded to the back of the OSB. 1.5.zip
: A layer of high-quality OSB that provides shear strength. : In Climate Zone 5, the R-6
: The overlay typically provides a permeance level of 12–16 perms , allowing the panels to "breathe" and dry out. : A layer of high-quality OSB that provides shear strength
, significantly lower than standard OSB and housewrap combinations ( 3. Advantages in Construction
Technical Analysis of 1.5-Inch ZIP System R-Sheathing in Modern Building Envelopes 1. Introduction
: It combines multiple steps (sheathing, WRB, and exterior insulation) into a single installation, which can be faster and cheaper than applying separate layers.