Step 7: Install Window

installing a window
Photo: David Carmack
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If the manufacturer has supplied snap-in metal flashing to cover the top of the window frame, apply a bead of caulk to the top edge of the window casing, then press the flashing in place.

If no flashing has been supplied, cut and bend a piece of metal flashing so it overhangs the front and sides of the casing by 1/4 inch and extends 3 inches up the wall. Fasten the top edge of the flashing to the wall with 1 ½-inch roofing nails and cover it with a strip of waterproof membrane long enough to cover the top ends of the two side strips.
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    Tools List

    • hammer
      20-ounce hammer
    • two-foot level
      2-foot and 4-foot levels
    • tacker hammer
      Hammer-tacker,
      for stapling builder's felt
    • utility knife
      Utility knife
    • 16-foot tape measure
      Measuring tape
    • caulk gun
      Caulk gun
    • drill
      Optional: Drill-driver and 1 5/8-inch stainless screws,
      for attaching sill extender to bottom of narrow aluminum sill

    Shopping List

    1. WINDOW

    2. CAULK

    3. MINIMIALLY-EXPANDING FOAM INSULATION

    4. 15-POUND BUILDER'S FELT

    an alternative to membrane for flashing the rough opening



    5. WATERPROOF MEMBRANE

    6. METAL FLASHING

    7. FOAM INSULATION

    8. 1 1/2-INCH ROOFING NAILS

    for fastening nailing fins to the sheathing