Understanding Window Selection

Window related water infiltration is a leading construction defect and a major cause of construction claims. Defects are often related to window selection, detailing, or workmanship.

When selecting windows, it is important for a designer to understand the performance grades identified in the North American Fenestration Standard (NAFS) and AAMA/WDMA/CSA 101/I.S.2/A440. The construction industry has multiple methods of flashing and installing windows, some of which are identified in ASTM E2112 – 07 (2016) Standard Practice for Installation of Exterior Windows, Doors, and Skylights. When Owners allow pricing to drive window selection, the allowance for errors in manufacturing and the installation process are significantly greater, thereby increasing the potential risk of failures. This presentation will review product selection, product installation, and window mockup and field testing.

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