What is the Best Method for Casement Window Replacement?

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  • Written By: C. Daw
  • Edited By: A. Joseph
  • Last Modified Date: 06 November 2019
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Casement window replacement is an easy task that includes measuring for the new window, taking the existing basement window out, and installing the new one into the opening. No special talent is needed, just a few basic tools and materials. The best method for doing this includes following simple steps and taking accurate measurements, which will keep the process of casement window replacement from becoming frustrating.

The first step of casement window replacement is for one to measure the existing window. These measurements can be taken to a home improvement store where a replacement window can be purchased. This step needs to be done first, because sometimes the window will have to be ordered, so one should not take the old window out before the new basement window is ready to install.

One can remove the old casement window by taking off all of the inside and outside trim boards. A reciprocating saw can be used to cut along the outer edges of the window frame, allowing the window to be pulled out. It usually is best for the window to be removed from the outside, but that can depend on the access that is available along the outer wall. Some basement windows do not have much room to work on the outside, so one must work with what is available when doing a casement window replacement.


The inner height and width of the opening should be measured and compared to the dimensions of the new window in order to make sure that it will fit properly. While this is done, one can use a level and check to make sure that the window frame is level. If it is not, shims can be placed where the frame needs to be adjusted.

The new casement window can then be slid into place. The installer should make sure that the leveling shims do not move. A level can be used to adjust the casing in order to make sure that the casement window is level all the way around the opening.

The window can be nailed into place with framing nails placed every 6 inches (about 15 cm) or so. If shims had to be installed to level the existing frame, the installer should nail through them so that they are secured between the new window and the existing frame. With the new casement window in place, one can take a sharp utility knife and cut the ends off any shims that are protruding out past the edge of the window. To do this, a deep line should be scored through the wood, then the shim can be snapped off along the line.

There are always gaps around the outer edges of any window, so a can of spray foam should be used to fill them. After it dries to hard foam, a sharp utility knife can be used to cut off the excess insulation. The window trim can then be replaced, inside and out, by nailing the pieces into place with finishing nails. Caulk should be applied around the edges of the trim boards before any paint or stain is applied.


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