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  1. #1
    Join Date
    Jul 2013
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    1

    Default How do you measure a exterior door that has to be replaced including the door jam.

    I would like to know how I would have to measure it if you could tell me Please.

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,444

    Default Re: How do you measure a exterior door that has to be replaced including the door jam

    Door sizing goes by the door dimensions. For example: 36" door means 36x80, 32" door means 32x80, etc.

    "Rough opening" is the opening in the house framing that will allow the door + the jamb to fit in.

    To determine your door+jamb size, remove the casing (molding) around the door from the inside and measure from stud to stud and bottom to header.

    If you don't know how to do it, get a finish framer/carpenter to help you.

  3. #3
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    888

    Default Re: How do you measure a exterior door that has to be replaced including the door jam

    don't forget to check the height too. some old doors are 78" high. if your door is not 80" or 78" high you might have to have a custom door made

  4. #4
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,510

    Default Re: How do you measure a exterior door that has to be replaced including the door jam

    When rough framing, the studs and header are made 2 inches larger than the proposed door. So the rough opening size of a 36" x 80" door is 38 x 82, unless you have a special replacement door.

  5. #5
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    1,004

    Default Re: How do you measure a exterior door that has to be replaced including the door jam

    Since the dawn of factory-made millwork, door dimensions have been called out in feet and inches. Bear this in mind so your notes aren't read at the millwork order desk as 3'6"x8'0" and not the desired 3'0"x6'8".
    Casey
    Remove not the ancient landmark, which your fathers have set.

  6. #6
    Join Date
    Jan 2008
    Posts
    1,337

    Default Re: How do you measure a exterior door that has to be replaced including the door jam

    With doors, Pro's have always called the shots in feet and inches. The big-box stores use inches only because their people are mentally maxxed out at that point, so some suppliers are following suit For a whole-unit replacement (door and jamb) I like to measure the old opening where it meets brick or siding, also checking with a framing square on top and bottom, then measuring the unit I want to buy myself to be sure it will fit or can be altered to fit easily.

    One of my main rules of remodeling is to never replace an exterior jamb unless you have to as there have been variances in the trim standards over the years so what you get today may not go- even though the door size is identical. I just saw where someone who didn't understand this replaced 2 perfectly fitting units with new ones that were 1/4 too small on 3 sides and to top things off, they didn't follow the original holes which were slightly out-of-pluimb. Their customer is buying it but I wouldn't. Had they replaced only the door it would have looked and worked beautifully just like the old ones did. Glad my name ain't on those!

    Phil

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