What We Do Not Know: Perspectives on Wall-Window Combinations and Performance Assurance We Have Yet to Address

Collaborative efforts over several years resulted in the development of ASTM E2112, “Standard Practice for the Installation of Exterior Windows, Doors and Skylights”. Individuals from the window, sealant, and air barrier industries were involved in the development of the standard. Development of the standard was driven by a desire to reduce water leakage attributed to window installation practices, particularly in residential and light commercial construction. A consensus document addressing the installation of fenestration units in residential and light commercial construction was believed to be needed. While many believe that the development of ASTM E2112 has helped to reduce the prevalence of leaking installations, the Standard, even in its most updated form (ASTM E2112-07), still has significant limitations. This paper addresses some of the limitations of the Standard and is intended to provoke the further development and documentation of installation techniques for a wide array of wall-window combinations that are not yet addressed in ASTM E2112.