Usually, it is essential to measure the width and height of the rough opening before buying a door unit. However, if you only need to replace the door frame because the slab is in good condition, then the key parameter is the door jamb size.
Incorrect measurements can lead to various negative consequences: if the frame is larger than the opening, it will have to be trimmed, and if it is smaller, your room, or even home as a whole (speaking of exterior doors), will not be reliably protected from extraneous sounds, draughts, dust, and so on.
In this article, our experts have compiled helpful information on accurately and quickly measuring door jamb size yourself. Following the clear instructions, every homeowner can cope with this task.
What is a door jamb?
A door jamb is the vertical part of the door frame to which hinges attach the slab. The door unit includes two identical elements for installation on the left and right side of the rough opening, as well as a header, which is a horizontal lintel mounted from above.
Door jamb measurements
First, prepare the necessary tools:
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Tape measure.
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Paper.
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Pen or pencil.
You can also enter all the data into your phone.
How to measure the jamb height?
To determine the door jamb's height, use a tape measure to gauge it from the floor to the top corner where the frame meets the header.
The jamb must be slightly higher than the slab's height for the door to be installed and operated correctly. The standard dimensions for the swing configuration are shown in the table (all measurements are in inches).
|
Door height |
Door jamb height |
|
80 |
81 ½ |
|
84 |
85 ½ |
|
92 ½ |
94 ½ |
|
96 |
97 ¼ |
How to measure the jamb width?
The width of the door jamb is equal to the wall thickness of the doorway. When measuring, it is important not to consider additional elements such as trim, casings, or decorative finishes.
We advise removing the trim for accurate measurements; however, if you have reasons not to, make sure that you measure from the visible edges of the jamb to get the correct size.
Our product range includes four options of jambs for 1 3/4" and 1 9/16" thick slabs:
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Type 80/4/116 (quarter 43).
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Type 80/4/116 (quarter 49).
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Type 80/5/116 (quarter 43).
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Type 80/5/116 (quarter 49).
Door jamb sizes
Choosing the right jamb size is essential for proper door function, aesthetics, and long-term maintenance of the door unit's original appearance. Ensuring that the rough opening and frame are as close as possible to each other will avoid many problems when installing the door and when using it, so we highly recommend taking measurements following the step-by-step instructions.
Thus, the standard door jamb dimensions are as follows:
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Height: 81 ½, 85 ½, 94 ½, and 97 ¼".
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Width: 4 9/16".
FAQ
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What is the right size of jambs for 2x4 and 2x6 frames?
The jamb width is:
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4 9/16" for a 2x4 frame with ½” drywall.
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5 1/2" for a 2x4 frame with thick drywall or stucco.
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6 9/16" for a 2x6 frame or a block wall.