There are many acceptable ways to mount and detail windows for support and weather resistance. Four typical methods for window framing are covered here. The installation approaches shown all include windows with integral mounting flanges, and all use taped foam sheathing as the water resistive barrier.
Covers the most common method of flanged window installation over foam sheathing where the flanges are mounted directly over up to 2" of foam sheathing.
Picture Frame Method:
Covers a “picture frame” concept with window flanges mounted to the picture frame. Commonly used with foam thicknesses of 3/4 inch to 1-1/2 inches to match common lumber dimensions.
Window Buck Method:
Covers a “window buck” concept with window flanges mounted directly over foam sheathing. Most common for walls with more than 1-1/2 to 2-inches of foam sheathing
Covers a “rainscreen” concept with window flanges and furring mounted directly over any thickness of FPIS.