What Is The Rough Opening For An Interior Door

What Is The Rough Opening For An Interior Door?

The rough opening for an interior door is the area left in the wall for the frame and door. Unlike windows, the rough opening for a door needs to be larger than the door itself, to allow for proper installation. The rough opening includes space for the:

Door frame
Shims or furring strips
Air gap between the frame and the wall
Clearance for the door to swing

The rough opening size will vary depending on the door size. The standard rough opening size for a 30-inch wide door is 36 inches wide by 80 inches tall. For a 32-inch wide door, the rough opening should be 38 inches wide. For a 36-inch wide door, the rough opening should be 42 inches wide.

Determining the Rough Opening Size

To determine the rough opening size for your door, you can either consult the door manufacturer's specifications or use the following formula:

Rough opening width = Door width + 6 inches

Rough opening height = Door height + 10 inches

For example, if you are installing a 30-inch wide door, the rough opening would be 36 inches wide by 80 inches tall. (30 inches door width + 6 inches = 36 inches) (30 inches door height + 10 inches = 80 inches).

When measuring the rough opening, make sure to take the measurements from the finished floor to the top of the rough opening and from the edge of the wall to the edge of the rough opening.

Framing the Rough Opening

Once you have determined the rough opening size, you can begin framing it. The rough opening should be framed with 2x4 studs. The studs should be spaced 16 inches on center. The top of the rough opening should be level, and the sides should be plumb.

Once the rough opening is framed, you can install the door frame. The door frame should be shimmed or furred out until it is flush with the finished wall. There should be a 1/8-inch gap between the door frame and the wall on all sides.

Installing the Door

Once the door frame is installed, you can hang the door. The door should be hung so that it swings freely. There should be a 1/8-inch gap between the top of the door and the door frame and a 1/4-inch gap between the bottom of the door and the floor.

Installing a door can be a challenging task, but it is essential for ensuring that the door functions properly and looks its best. By following these steps, you can ensure a successful door installation.