Step 3: Install the window

Tom Silva installing a window «»
Fold out the window unit's nailing fins so they are perpendicular to the sides of the window frame. Then set the window's sill into the bottom of the rough opening, and tip the frame into the opening until all the nailing fins are tight against the wall.

Have an assistant stand inside and tell you when the gaps between the sides of the window and the jack studs are equal on both sides. Tack the nailing fin to the sheathing at one upper corner with a 1 ½-inch roofing nail, but do not drive it all the way in.

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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