Door Rough Opening Width

The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide.

Door rough opening width. For example let s say we want to frame a 6 8 x 3 0 front entry door. Standard door rough openings. Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide. Typically a pre hung door is measured in 30 inch and 36 inch sizes with additional sizes available in non standard widths.

Just add 2 to the width of the actual door size. You should add 2 1 2 to the height of the actual door. For prehung single doors the formula is simple just add 2 for the width and 2 1 2 for the height. The doors are also a standard 80 inches tall.

Getting the rough opening size right the first time will save you from frustration when installing your doors. The rough opening for a door is directly relational to its size. Presuming the door is a 36 inch wide door the dimensions of your opening should be 37 inch wide by 81 inch tall. The reason why the rough opening is 2 wider than the door is because of the door jamb on each side and the room needed to set the door.

If you re going to frame a rough opening for a door then you ll need to know the unit size. Of frame is 40 x 86 as the frame face is 2 around all 3 sides. Standard dimensions for rough door openings are based on the door itself not the surrounding jamb and sill so take care to ensure you measure the correct component of the door assembly. This will give you room to space the door frame off of the sub floor.