Framing Windows

The framing required for a window for structural support is very similar to door framing. One added feature is crippling studs below the window to support the sill. Other aspects include a header supported by king studs with jack studs (to support the header) on either side. Some local building codes may require blocking between the king and next stud.

King and jack studs are necessary; they transfer the weight of the home’s structure to the sole plate below. Headers are built using 2X8s, 2X10s, or 2X12s, with a ¾-inch piece of plywood sandwiched in between. Other aspects of framing for a window include the top plate, sole plate, and rough sill.

Window manufacturers usually specify the size of rough opening required for window installation. Although modest-sized windows can many times be handled as a DIY project by a homeowner with house structure requirement knowledge, a helper will most likely be required for at least some aspects of window installation. For instance, to hold the window in place while the window is shimmed, so it will be level and plumb.

When it comes to wide window openings of 6-feet or more, some building codes require special trimmer methods. Although this might add to the expense, it helps adequately handle the extra load of large windows. In addition to following any local framing code requirements for window installation, a permit might also be required. Check with your local Building Department to see if this is true in your area before beginning your project.

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