How to Install Garden Windows

October 11, 2010

If you have installed a window in your house before, then learning how to install garden windows should be a breeze. If you have never completed this type of project before, then review the installation instructions which come with your new window and follow these general guidelines of how to install garden windows:

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  1. Remove the exterior trim and the old window from the wall of the house.
  2. Measure the window opening to ensure that the new window will fit properly. It may be necessary to trim back a small portion of the siding to accommodate the aluminum flashing and nailing fins which are attached to the perimeter of the new window.
  3. Using a building wrap, such as Tyvek, cover the edges of the window opening and any exposed wall sheathing, making sure to overlap the existing building wrap by several inches.
  4. Apply a bead of silicone caulk around the window opening, making sure that the window's nailing flange and flashing will cover the caulk, creating a weather tight seal.
  5. Lift the window into the opening, keeping in mind that it may require several people to lift the window and hold it in place until some temporary wood supports can be installed.
  6. Make sure that the window is level and plumb, installing wood shims where necessary.
  7. Nail the window into place using 2-inch roofing nails.
  8. Once the window is secure, remove any temporary supports.
  9. Cover the nailing flange with self adhesive flashing tape, starting with the bottom, then the sides, and finally the top. Overlap the corners, making sure that water will shed off the wall without penetrating the flashing tape.
  10. Install the exterior trim pieces and caulk the seam between the window and the trim, and the trim and siding.

Installing the window correctly is necessary for a weather-tight fit. If you do not understand how to install garden windows, then hire a contractor to help with the project.

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