How To Calculate Door Jamb Size

Refer to the charts below to determine what size of door you will need. To measure the door jamb size you may need to remove any trim moulding or siding you have on the door. A 500mm wide 720mm high carcass will need a door 496mm wide 500 minus 4 496 and 715mm high 720 minus 5 715 this seems to be the most common size for standard units although a 500mm unit door can be anything from 495mm to 498mm.

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How To Measure A Door Jamb Eto Doors Blog

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For 2 1 2 inches door thicknesses the standard backset is 3 8 inches.

How to calculate door jamb size.

Again here are the measurements from my small closet door if it helps to see. Measure this by removing the casing from one side to reveal the side of the door jamb. The gap should contain small cedar wedges that are used to level and plumb the jamb. Measure from the bottom of the sill to the thickest part of the header add 1 1 4 to find the estimated unit size frame members typically measure 1 1 4.

To determine backset here is a general rule of thumb. The difference between a rough opening and finished opening is usually 2 3 inches. For door thickness from 1 3 8 inches up to 2 1 4 inches the standard backset is inch. As an example if the desired finished door opening is 32 then calculate 32 1 2 1 to arrive at the actual door size including overage.

Figure out the thickness of the door. These numbers should be close to the same but it can be helpful to know both of them. Hold a tape measure to the edge of the door and record its thickness. Height of new door opening dimension minus top piece of door frame thickness minus gap at the top between door and jamb minus 1 gap at bottom.

Measure this edge on the door frame known as the jamb as well. Casing is easy to pry loose with a pry bar or even a screwdriver. Estimated rough opening add 1 2 to unit height measurement. 4 9 16 for 2x4 frame with drywall.

Enter the correct measurement in the worksheet on the right. Calculate the height of your new door. Subtract the 4mm from the width of the carcass and 5mm from the height example. Typical door jamb sizes are.

The most common thickness is 1 75 inches 4 4 cm. If you have questions give us a call at 888 458 5911. If you do not remove the trim measure from the inside edges of the trim or moulding make sure you are measuring from the visible edges of the jamb to get the correct size. While a standard door height is 80 finished opening.

There will be a gap between the jamb and the rough framing. Door jamb thickness is almost always 3 4 inch. Determine how much clearance you ll need to keep the door from contacting the casing or trim. For reference standard interior door widths range from 24 36 finished opening.