Sequence 3//Flanged window installation // water managed // building paper

A water-managed window installation properly weatherlaps and integrates the window unit and the rough opening flashings and weather-resistive barrier (WRB). It is appropriate for moderate to high weather exposure. In this 14-step installation series, the window unit goes in before the WRB (building paperTypically referring to Grade D building paper, this product is an asphalt-impregnated kraft paper that looks a lot like a lightweight asphalt felt. The Grade D designation has come to mean that the building paper passes ASTM D779 (minimum 10-minute rating with the “boat test”) and different products are called out as “30-minute” or even “60-minute” based on D779 results. At times confused with roofing felt, roofing felts and building paper differ in two ways: felts are made of recycled-content paper, building papers of virgin paper; felts are made of a heavier stock paper; building papers a lighter stock. See also roofing felt.) goes up.

Details that show the complete and final configuration of window installations are fine, but window installation step-by-step series are where the rubber meets the road.

DRAWING DETAIL

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