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How to Replace Andersen Casement Windows

Andersen casement windows are available in both wood and vinyl, and can be custom sized to fit any opening. Casement windows are different from the more conventional sliding and double-hung windows. They crank open by turning a handle on the bottom of the window. Andersen casements come equipped with an insect screen and Low-E glass. Installing an Andersen casement window is no different than installing any other type of casement window. Homeowners can complete this project in an afternoon.

Step 1

Pry off the trim located on both the interior and exterior of the old window with a pry bar. Cut along the sides of the frame between the window and the jamb with a reciprocating saw to break the window free from the screws. Cut the sill along the bottom frame of the window directly in half and push the window out of the opening to remove it.

Step 2

Clean off the area where the old window was to remove any dirt and debris and measure the opening to determine the exact size window you need to install. Measure both the length and width of the opening three times and record the smallest measurement. Set a level along the sides and base to make sure everything is plumb and square.

Step 3

Apply flashing tape along the sill. Roll it out over the bottom of the sill and a few inches up each side and nail the corners along the outside of the opening in place. Run a 1/4-inch bead of silicone sealant along the exterior of both sides of the opening and along the top. Place the silicone sealant in a caulk gun and push down on the caulk gun until the sealant begins to come out.

Step 4

Center the window in the opening and push it into place from the exterior. Press down on the sides and top of the nailing flange so it can adhere to the silicone sealant. Insert a nail in each corner of the nailing flange to hold the window in place. Add shims to the sides of the window to level it out.

Step 5

Set a level down again to make sure it is plumb and square. Insert nails with a hammer into all the openings on the nailing flange to secure it to the wall. Apply flashing around the sides of the window with silicone sealant. Cut the excess shims off with a utility knife. Add sealant to all sides to ensure everything is secure.

About the Author

Alexander Callos began writing in 2005 for "The Lantern" at The Ohio State University and has written for various websites, including Bleacher Report, Top Ten Real Estate Deals and Columbus Sports. He has published articles for CBS Sports, SI.com and other websites. He graduated in 2007 from The Ohio State University with a bachelor's degree in public affairs journalism.