Framing Rough Openings
Framing rough openings for windows and doors (standard door and windows openings) is really straight forward if you follow some simple dimensional rules. For standard wood framed construction the rough openings for doors and windows is typically the actual unit size plus 2-1/2 inches in height and width.
Standard Door Rough Openings
If you’re going to frame a rough opening for a door then you’ll need to know the unit size. For example, let’s say we want to frame a 6/8 x 3/0 front entry door. The 6/8 stands for 6′-8″ tall and the 3/0 stands for 3′-0″ wide. Therefore the rough opening would be 82-1/2″ tall by 38-1/2″ wide.
82-1/2 inches also happens to be the standard “header height” for windows and doors. If you’re a novice framer then this is the height of the BOTTOM of the window and door headers. This is also the top of the jack studs. Which means the jack studs are 81 inches long (typically).