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Window Installation - An Evolving Challenge

by Thomas K. Butt, FAIA
November 8, 2004

Techniques for window installation have been evolving rapidly. For many years, the accepted standard involved four strips of flexible flashing integrated with a nailing fin and the weather resistive barrier (WRB) at the window perimeter. This concept was easy to understand and implement because the window fins, the flashings and the WRB were typically all in the same plane. It is amazing, however, that so many designers and builders were still able to get it wrong.

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