R-Guard Installation Detail
Window Head Using rigid metal cap
metal studs with gypsum sheathing/OSB sheathing/plywood
Install the window “plumb, level and square” into the rough opening prepared with Joint & Seam Filler and/or FastFlash as shown in 4.1 and 4.3.
Use AirDam as the interior air sealant to ensure compatibility with the treated rough opening and create a long-lasting, weather-tight seal (see 8.1).
To transition from the air- and water-resistive barrier to the rigid metal cap flashing, apply a bead of FastFlash immediately above the top edge of the rigid metal cap flashing. Use a dry joint knife or trowel to spread the FastFlash a minimum of 1 inch onto the metal flashing. Ensure all fasteners are covered with FastFlash and create a seamless counterflashing membrane, which directs bulk water from the air- and water-resistive barrier to the rigid metal cap flashing.
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