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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