1.5.zip ❲2026 Release❳

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

: It combines multiple steps (sheathing, WRB, and exterior insulation) into a single installation, which can be faster and cheaper than applying separate layers. 1.5.zip

: A 1-inch thick layer of polyisocyanurate (polyiso) foam bonded to the back of the OSB. : The overlay typically provides a permeance level

: A factory-applied water-resistive and air barrier on the exterior face. Key Performance Metrics: R-Value : Provides a thermal resistance of R-6.6 . : A factory-applied water-resistive and air barrier on

: When properly taped, ZIP walls can achieve air change rates of

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

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