The Process of Vinyl Window Replacement

Measuring

• Accurate measurements of the window are essential when buying replacement windows. If this part of the process is rushed, you are likely to end up with a window that is too large or too small, making the installation more difficult or impossible without major renovations. Measure across the window from one jamb to the other at the top, middle and bottom of each window, using the smallest measurement you get.

  Measure the height of the window from the top edge of the sill to the bottom edge of the head jamb, again using three measurements to find the smallest one. Measure diagonally from the corners. You should get the same measurement for both diagonal measurements if the window is square. For measurement differences of more than one-fourth inch, consult with the vendor to determine if special accommodations are necessary.

Old Window Removal

• To remove the old window, you must first remove the stops, which are the wood trim pieces nailed to the frame. The should allow you to remove the lower sash, which is the framed part of the window that moves up and down. The upper sash is next to be removed, followed by the jamb liners and sash weights, if they are present. Once the old window is removed, you are able to add spray insulation made for windows so it doesn't expand too far and ruin the frame.

New Window Installation

• A bead of elastomeric caulk is run along the inner surface of the exterior casing and along the windowsill as a way to seal the window. The vinyl replacement windows are lifted into the opening from inside the house, with the bottom going in first and the top tipped into place. Attach the window with one screw on the side of the frame so you are able to shim it to make the window level and square. You are then able to continue screwing the window in place.

Finishing

• When the replacement window is secured, you are able to finish off the window. Gaps on the exterior of the window of more than one-fourth inch require foam-rubber backer rod as a filler. Elastomeric caulk is then used to fill the gap. If the gap is less than one-fourth inch, simply use the caulk. Low-pressure expanding spray foam works well to fill in gaps on the inside of the window. If you're reusing the old window stops, attach them to the interior of the window. You also have the option of using new stops. Painting or staining the wood components of the frame finishes off the project.