How to Replace Energy-Efficient Windows
- 1). Take measurements for the replacement windows. Measure the height and width of the windows inside the window jambs. Take measurements on each end and in the middle; use the smallest measurement in each direction to determine the size of the new windows.
- 2). Remove the wooden stops inside the jambs. Pry them off with a hammer and pry bar, or unscrew them if they are screwed on. Carefully remove the stops so you can re-use them on the new windows.
- 3). Press the jamb liners in, then lean the top of the window sash toward you and tip it to one side. Lift the sash out of the window frame.
- 4). Pry the jamb liners off the window frame.
- 5). Scrape chipped paint off the window frame. Patch any nicks and holes in the window frame with exterior-grade wood putty, then sand the frame smooth.
- 6). Scrub the window frame with a cleanser, using a bleach-based solution if there is mold on the windows.
- 7). Pull insulation out from around the window frame. Wear a mask, gloves and safety goggles when removing the insulation, and avoid coming into direct contact with the insulation.
- 8). Drill holes into the sill and the head jamb with a 3/8-inch drill bit, placing one hole near each end and one in the middle of the sill.
- 9). Spray expanding foam insulation into the holes, adding insulation until the holes are filled. Spray foam into the side jamb and allow the foam to set for the time specified on the packaging. Break off any excess foam from the frame after the foam hardens.
- 10
Add two thick beads of caulk around the window frame. - 11
Set the bottom of the new window onto the sill with the top leaning toward you. Place the head expander across the top of the window if one was supplied. Push the window back into the frame and lift the top of the window into position. Check the window for plumb (vertically straight) with a carpenter's level. - 12
Temporarily drive 2-inch screws through the jambs and into the frame near the top of the window. Lock the sash to prevent the window from opening while you finish the installation. - 13
Measure the window diagonally across in both directions. Center the window in the frame by adding shims inside the frame around the edges of the window. - 14
Attach the window to the frame by driving screws through the pre-drilled holes in the sides of the window. Remove the temporary screws, then trim any shims you installed with a utility knife. - 15
Fill the gaps around the perimeter of the window on the exterior of your home. Use elastomeric caulk for gaps that are smaller than 1/4 inch; for larger gaps, use foam-rubber backer rod. - 16
Fill gaps around the perimeter of the window on the inside of the house with expanding foam insulation. - 17
Nail the window stops into position with 4d finish nails. - 18
Apply caulk to the gaps around the window on the perimeter of the house. - 19
Paint or stain the interior frame.