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How to Measure My Door?

How to measure a door for replacement

SLAB SIZE

Slab is the actual door without any frame or hardware. If you are planning to only replace the door and keep the frame as is, then you will need this measurement. The size of the new door should be exactly the same as your existing door (height, width, thickness) or if it is slightly larger, you should make sure that the door is trimmable to the size.

Questions to ask from the supplier & contractor:

  • How much is allowed to cut this door from height and the width
  • Does the warranty voids if we cut the door ?
  • Is there any labor charge to trim the door?

NET FRAME SIZE

Dimensions taken from outside the frame, excluding. This is needed for the time you want to replace the door & frame. Net frame size may vary for each manufacture...Most of the manufacturers will offer to trim the from the height & width, but not more that 2 inches. Thus, the the standard net frame size is slightly smaller than the door, you should ask if they will trim the door for you or not.

Questions to ask from the supplier & contractor:

  • how much is allowed to cut this door from height and the width
  • does the warranty voids if we cut the door ?
  • Is there any labor charge to trim the door?
  • what is the jamb size?
  • what type of brickmould do I need?

ROUGH OPENING

Rough opening is the size of the hole that is cut in the wall despite the construction materials whether it is wood, metal, or masonry .

You should know this dimension at the time shopping for the door. The Rough Opening is typically about 1-1/2” wider than the unit size and about a 1” taller. This is necessary for the following reasons:

  • Each manufacturer have it’s own standards and that might cause the actual doors to be slightly different.
  • The frame thickness will be added to the door size.
  • You will need about 1” in total width and height to be able to adjust and shim the door.
  • The openings are not always square , so it is good to have a little extra gap. This gap will be covered by Brickmould & casing.

Remove the trim/casing to expose the bare studs.

Removing Casing

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Removing interior wood trim — baseboard, chair rail, window and door casing — requires little more than a hammer and pry bar. But to avoid ripping out large sections of drywall facing along with the trim, use a sharp utility knife to score the seam between the molding and the wall. Apply just enough pressure to cut through the dried paint and into the paper face of the drywall. Now when you pry off the trim, it will come away cleanly.

The Rough Opening is typically about 1-1/2” wider than the unit size and about a 1” taller. (double doors extra ½” in width for T- astragal)

measuring the rough opening

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Measure the width of the opening (stud to stud) in 3 places, the top, middle, and bottom and record the smallest measurement. Measure from the base of the header to the floor on the left and right and record the shortest height measurement.

No Worries, you can calculate the rough opening with a little tolerance . Here is how we can do this:

The goal is to measure the Stud to stud.

The goal is to measure the Stud to stud

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Unit size: Measure the jamb (hump to hump) (measure the thickest part of the jamb) The width measurement is from the inside of one jamb to the other. Enter the correct measurement in the worksheet on the right.

 Measure the jamb (hump to hump)

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Add 2 1/2" (Frames generally measure 1 1/4" thick each x2) this will be the estimated unit size.

 Measure the jamb (hump to hump)

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Estimated rough opening add 3/4 to unit width measurement

 Measure the jamb (hump to hump)

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Unit size: Measure the jamb(hump to hump) (measure the thickness part of the jamb) 35 1/8
Add 2 1/2" (Frames generally measures 1 1/4" thick each X 2) 2 1/2"
Estimated Unit Size: 37 5/8"
Estimated rough opening add 3/4 to unit width measurement 3/4"
Estimated rough opening 38 3/8"

The height measurement is from the bottom sill to the top rail. Enter the correct measurement in the worksheet on the right. Unit size: Measure from the bottom of the sill to the thickest part of the header

Height Measurement

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Add 1-1/4" to find the estimated unit size (frame members typically measure 1-1/4")

Height Measurement

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Estimated rough opening add 1/2" to unit height measurement

Height Measurement

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Unit size: Measure from the bottom of the sill to the thickest part of the header 80 3/4
Add 1 1/4" (Frame members typically measure 1-1/4") 1 1/4"
Estimated Unit Size: 82"
Estimated rough opening add 1/2" to unit width measurement 1/2"
Estimated rough opening 82 1/2"