How to Build a Double-Insulated Glass Window

Heat loss through window openings accounts for as much as 10 to 25 percent of a home’s heating costs, according to the U.S. Department Of Energy. Building a double-insulated glass window provides an added barrier that prevents heat from escaping through window surfaces. A second windowpane can be added during the cold months and removed once warm weather arrives.

Tape measure
Window glass
Wood trim
Trim nails
Handsaw
Caulk

Instructions

- 1
  Measure the height and width of the window opening with a tape measure to determine the size of glass needed. These measurements can also be used to determine the length of any trim materials needed.
- 2
  Cut the glass, according to the dimensions measured, or have the glass cut, when purchased, at the hardware store.
- 3
  Use a handsaw to cut the lengths of trim pieces needed to fit along the outside of the window opening.
- 4
  Construct a four-sided window frame. Window frame materials come in finished and unfinished styles, including "S" and "SG" models. The "S" model consists of unfinished softwood while the "SG" model has a glazed surface. Use trim nails to attach the frame pieces together. Hold the frame up against the window opening to ensure it’s the right size.
- 5
  Apply caulk around the edge of the window opening. Press the glass against the caulked area and allow the pane to rest inside the window opening.
- 6
  Add caulk along the outside edge of the window pane. Press the window frame against the caulked areas on the pane until the caulk dries and a seal forms.

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Window & Door Repair