Installing High-Performance Windows - Preparation

Acoustical sealant would bed the sheathing that would bridge the interior (2x4) wall and the exterior (2x6) wall around the window opening.

Half-inch OSB Zip Wall sheathing was bedded into sealant around the perimeter of the window opening.

The window openings were cut after the sheathed building was blower-door tested for airtightness.

3-M All Weather tape, pressed in place and rolled, was used to seal the sill-to-jamb intersection.

A 5/4-by-6-inch dam was installed across the length of the sill to support the window.

Pieces of beveled siding extending from the dam to the edge of the opening formed a sloped drainage plane.

The folded flashing tape was lined up with a centerline previously marked on the dam.

Flashing tape was adhered to the dam about 2 inches from its edge.

The tape was folded down the face of the dam and over the bevel siding. The ends of the tape extended 4 inches up the jambs.

A 10-inch-wide strip of felt paper was stapled below the opening to help shed moisture.

The remaining 2 inches of flashing tape was lapped over and adhered to the building paper. Rolling the flashing surfaces improved adhesion.

The lower portion of the jamb flashing lapped over the upturned sill flashing. The inner edge of the tape was positioned to be inside of the window's exterior face.

The head flashing was lapped over the jamb flashing. A small piece of flashing sealed the intersection of the three planes.

The flashed opening awaits its window.

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