A jalousie window, also known as a louvered window, has parallel glass that opens and closes together. These panes of glass are tilted to allow for ventilation, and a unique lever is cranked to maneuver the glass. Due to the fact that air can leak through jalousie windows even when they are closed, they are most common in mild climates. There are ways to garner the aesthetic benefits of a jalousie window, however, while still maximizing its energy efficiency. To install a jalousie window that is as energy-efficient as possible, follow the steps below.
First, remove your old window. Pry away the nails, remove the trim, and scrape away old caulk. Also brush away dirt and debris, using bleach if the area must be thoroughly cleaned. Before purchasing your jalousie window, make sure it will fit inside your window opening. Jalousie windows should be no more than an inch shorter (in terms of both height and width) than the opening. When you have the window in hand, begin by wrapping the opening with a two-foot wide strip of 15-pound felt paper. Wrap over the sill and down the wall. Repeat for the sides and top, allowing the felt paper to overlap at the corners.
Next, add flashing to the perimeter of the window opening. Be sure to leave about a half-inch of extra room on each side. Then, place the jalousie window into the opening, centering it as well as possible. You can nail one of the top corners to keep the window steady while you adjust it to make it level. Once you ensure it is balanced and a tight fit, you can add the other nails and caulk the gaps between the trim and frame. A thin layer of sealer will also keep out moisture. Lastly, make sure the jalousie window is functioning properly before using wood putty in the holes that are left.