How to frame a door.
Frame opening for 24 inch door.
The required size of the finished opening for a 48 by 80 inch door is 48 by 82 inches.
Measure your door carefully and cut the opening to fit using a reciprocating saw.
Typically a pre hung door is measured in 30 inch and 36 inch sizes with additional sizes available in non standard widths.
Add 2 to 2 1 2 inch to the measurement of the door s width to determine the total width of the rough opening.
Take out the section of drywall which is above the door in order to frame the new header.
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A typical door opening is 2 inches 5 1 cm wider than the door size being installed to allow for the thickness of the jamb material and shims to plumb the jamb.
This will need to be 1 inch 2 54 cm more than twice the length of the pre existing header since it will need to span the distance of the entire rough opening.
For the height of the rough opening you need to add 2 inches to the height of the door.
This takes into account the thickness of a standard 3 4 inch doorjamb on each side.
The doors are also a standard 80 inches tall.
Presuming the door is a 36 inch wide door the.
This allows for 1 2 inch thick drywall on both sides and at the top 80 inches for the doors and hardware and a 1 to 1 1 2 inch space under the door the space between the floor and the bottom of the door may vary depending on the type of flooring.
So if each door measures 30 inches wide the width of the rough opening should be 62 inches.
Be sure to allow for about a 1 inch larger opening than the standard door sizes.
Rough opening width in 25 5 3 26 0625 336 26 5 8 26 221 rough opening height in 81 5 3 81 6.
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The rough opening should be 49 by 82 for a 48 by 80 inch door.
If your door s height is 80 inches then the height of the rough opening should be 82 inches.
Use a section of 2 by 4 5 08 by 10 16cm as the new header.
Be careful to keep the cut shallow.
Measure the opening to your door frame.
The height is 80 which is considered 6 8 or 6 8 add 2 1 2 to the actual door height and frame it 82 1 2 high.
Make sure your door opening reinforces the wall above and on both.
So if you have a bedroom door that is 30 wide which is considered a 2 6 or 2 6 door just add 2 to the width and frame it 32 wide.
That way you can be sure the opening is wide enough.
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Determine the size of the door opening.