Standard Window Rough Openings
Window rough openings are framed in a similar way to door openings. Again I like to use examples so let’s say we’ve got a 3′ wide by 4′ tall window unit then the rough opening would be 38-1/2″ wide and 50-1/2″ tall. Now, most window manufactures actually specify a standard rough opening which is typically a bit tighter so it’s best to follow the manufacturers recommendations when possible.
As I mentioned above with reference to doors, the window header height will typically match the doors which is 82-1/2 inches for a 6/8 door. The jack studs end up the same as the door jack studs and the cripple studs can then be calculated by subtracting the window rough opening height from the jack stud height minus an additional 1-1/2″ for the sill plate.
Non-Standard Rough Openings
The rules above work well for most standard windows and doors. However, you’ll need special rough openings for:
- Fire rated doors.
- Bi-Fold closet doors.
- Bypass closet doors.
- Slider doors.
- Pocket doors.
- Out-swing patio doors.
Good luck framing and remember to keep your openings square!!