How to Replace a Vinyl Casement Window

Lead Image for How to Replace a Vinyl Casement Window
  • 4-6 hours
  • Intermediate
  • 450-1,200
What You'll Need
Fiberglass insulation
New window casement and installation kit
Screwdriver and screws

A vinyl casement window is a sturdy and weather-proof type of window and framing that is both inexpensive and durable. Many homeowners replace their existing windows with vinyl casement windows in order to protect their homes from the elements. Whether you're installing a new vinyl casement window in place of another type of window, or if you're replacing an old or damaged vinyl window with a similar model, the following steps can serve as a guideline for completing the installation process easily and properly.

Remove the Old Window

The first step is to remove the old window. Remove any nails or screws that have been used to attach the casement frame to the surrounding area and carefully loosen around the edges of the casement with the chisel. If possible, it is best to pull the entire frame out of the wall area at once. However, if this isn't possible, you can remove the window itself first and the frame after. If you're replacing it with a new casement window of the same design, there's no need to remove the frame.

After taking the window itself out of the frame, strip off all of the casement moldings using your chisel. Be careful not to damage them, as these can be used later. Next, take off any existing balances or other leveling devices and then remove the frame. Store all materials safely away from the workspace.

Install Sill Angle

Install the sill angle at the base of the frame according to the instructions. This piece should come along with the vinyl window itself. For best results, install the sill angle about 1/8-inch behind the blind stop of the frame.

Check the Window and Fill the Weight Openings

Fit the window into the frame to verify that it is the proper size and shape. If it is not, you'll have to complete a small remodeling job in order to modify the frame opening. Next, fill in any gaps that were previously filled with weights for balance. You can use fiberglass insulation to complete this task if it's necessary to do so.

Caulk the Window Stool

Apply caulk to the inside edge of the window stool. Be careful not to lay too much caulk, as this could interfere with the window's alignment and cause it to bow or bend.

Lock the Window Sashes and Place in the Frame

Make sure that the sashes on the window are locked and place the base of the window into the new frame area. Rest it against the blind stops if necessary.

Check for Level and Install Screws

Check that the window is level and then use a screwdriver to insert screws into the pre-drilled screw slots along the length of the frame. The screws should come with the installation kit.

If you have any questions about your installation procedure, contact a hardware specialist for further advice.