Exterior Door Rough Opening Size

Getting the rough opening size right the first time will save you from frustration when installing your doors.

Exterior door rough opening size.

For example let s say we want to frame a 6 8 x 3 0 front entry door. You should add 2 1 2 to the height of the actual door. If you re going to frame a rough opening for a door then you ll need to know the unit size. For the 36 x 80 exterior doors this rough opening will need to be 38 inches by 82 1 8 inches.

Just add 2 to the width of the actual door size. Double inswing wide mullion unit and rough opening sizing lf ff ff rf fl fr lf rf fl fr viewed from the exterior hand designations f l r fixed panel left hand right hand inswing outswing. Standard door rough openings. Keep this in mind.

Framing rough opening sizes are really quite simple. The rough opening for a 36 inch pre hung door is is 38 5 inches by 82 inches. This will give you room to space the door frame off of the sub floor. Use shims and or caulk to seal gaps between wall and frame.

Rough opening brickmould dim. Frames that butt wall block or exterior wood stud a opening width 4 1 2 b opening height 2 1 4 the rough opening would be 40 1 2 x 86 1 4 for a 3 0 x 7 0 door frame. Double outswing wide mullion double wide mullion 6 6 6 8 7 0 8 0 rough opening brickmould dim. The rough opening size is the construction size with the side lumber studs and header.

The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide. As you can see the standard exterior door size rough opening is a full 2 inches wider than 36 inches and 2 1 8 inches higher than 80 inches.