What Does Window Rough Opening Mean

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What Does Window Rough Opening Mean? A Comprehensive Guide

A window rough opening (WRO) is the opening in the wall where a window will be installed. It is typically framed with 2×4 lumber and sheathed with plywood or OSB. The WRO should be slightly larger than the window itself, to allow for shimming and caulking.

How to Measure a Window Rough Opening

  1. Measure the width of the opening from the inside edge of one stud to the inside edge of the other stud.
  2. Measure the height of the opening from the top of the header to the bottom of the sill.
  3. Add 2 inches to both the width and height measurements to get the rough opening size.

How to Install a Window Rough Opening

  1. Frame the WRO with 2×4 lumber, using 16-inch on-center spacing.
  2. Sheath the WRO with plywood or OSB.
  3. Install a header above the WRO, using 2×6 or 2×8 lumber.
  4. Install a sill below the WRO, using 2×4 or 2×6 lumber.
  5. Flash the WRO with house wrap or roofing felt.

Tips for Installing a Window Rough Opening

  • Make sure the WRO is square and plumb.
  • Use shims to level the window.
  • Caulk around the window frame to seal it from air and water.
  • Trim the window opening with molding or casing.

Conclusion

Installing a window rough opening is a relatively simple process, but it is important to do it correctly to ensure that the window is installed properly and will last for many years. By following the steps outlined in this article, you can be sure that your window rough opening is installed correctly.

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