A: Square and Level Framing B: Rough Window Opening C: Rough framed opening sufficiently larger in width and height than the actual frame dimensions of the window. To assure adequate clearance consult the window manufacturer's literature for the recommended rough opening dimensions. A: Wall sheathing (where occurs), verify sheathing edges, and flush with frame opening B: Extend sill flashing horizontally to protect beyond vertical jamb, flashing applied later C: Apply sill flashing horizontally below the sill. Fasten the top edge of the sill flashing to the framing; but do not fasten the lower edge, so the weather resistant building paper applied later may be slipped up and underneath the flashing in weatherboard fashion. A: Jamb flashing at both sides of opening. Extend beyond sill flashing and above where head flashing will intersect. Lap jamb flashing over top of sill flashing. Leave bottom edge attached. A: To seal the window frame to opening, apply continuous seal to the backside of the mounting flange near the outer edge or, apply continuous seal to perimeter of opening at a point to assure contact with backside of mounting flange. B: Shim and adjust window to achieve square, plumb and level condition. Use corrosion resistant fasteners. Fasten with 10" and no closer than 3" in each direction from every corner. Secure window around frame opening with equivalent of 6d fasteners at 16" O.C. maximum. C: After installation, seal all corners of mechanically joined frames to seal frame seam juncture. A: Apply continuous seal along top (head) mounting flange. Embed bottom of head flashing against sealant (flashing goes over sealant). Extend head flashing beyond each jamb flashing. Fasten in place.
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