Standard Interior Door Rough Opening

The rough opening for a standard sized interior door is 2 inches wider than the state size of the actual door.

Standard interior door rough opening.

For fire rated openings drywall must extend at least 1 2 into frame. You should add 2 1 2 to the height of the actual door. This will give you room to space the door frame off of the sub floor. And avoid toenailing when possible.

Door widths vary but an easy way to size the rough opening is to use the door width plus 5 in. Doors come in a variety of sizes so a general rule of thumb or practice is considered. Be sure to allow for about a 1 inch larger opening than the standard door sizes. Maintain a simple consistent nailing pattern.

Standard interior door width is 32 inches. This is the minimum width required for a passage door. Typically a pre hung door is measured in 30 inch and 36 inch sizes with additional sizes available in non standard widths. There are three simple rules to framing rough openings efficiently.

Framing rough opening sizes are really quite simple. Just add 2 to the width of the actual door size. This takes into account the thickness of a standard 3 4 inch doorjamb on each side. The standard height of the rough opening for a door is the door height plus 2 5 8 inches.

Standard door rough openings. Interior knockdown frames that wrap wall a opening width 2 b opening height 1 the rough opening would be 38 x 85 for a 3 0 x 7 0 door frame. The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide. If you re going to frame a rough opening for a door then you ll need to know the unit size.

Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide. You may also find a few narrower doors in stock including 30 inches 28 inches and 24 inches. The additional room allows for a 3 4 inch top jamb a shim space above the door jamb and the thickness of. For example let s say we want to frame a 6 8 x 3 0 front entry door.

Measure the opening to your door frame.