Matt Risinger stormed onto the scene at the International Builders Show this week. In his first video blog he interviews a product manager for OSI (the manufacturer of sealants and construction adhesives). Combining a computer game to teach the steps, with a 16-module in-depth training program, OSI has undertaken the task of training window installers. In exchange for taking the program, an installer gets certified, and the installation using OSI sealing materials gets a 15-year warranty, regardless of the window being used.
Matt Risinger walks us through the basic steps involved. Essentially this appears to be an ASTM A1 method, but OSI does things a little differently than we've seen recently (see "Rethinking Window Flashing," Nov/15, and "Installing Flanged Windows: Two Strategies Compared," Jan/16. ). Namely, the OSI system calls for cutting back the WRB at the sides - past the window flange, so the self-adhered flashing at the sides sticks to wall sheathing. For sill flashing, OSI includes both "bow-ties" and a flexible, butyl-based sill pan. And at the head, there is no skip taping; instead there is continuous tape applied after the WRB flap is folded back down. See video below.
We'll cover more about this one soon. Still to be determined is how well will the OSI method conform to the window manufacturer's installation instructions. That becomes a key issue in the 2105 IRC, which clarifies for the first time how to handle conflicting product requirement. According to the 2015 code, the window manufacturer's instructions (or ESR) take precedence over all other product instructions. Stay tuned for more.