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Thread: Dimensioning windows

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    Dimensioning windows

    Does anyone know if or what the rule might be as far as dimensioning windows on residential floor plans?
    I know they should be the first string.
    And I know framers (in this area) like to have the dimensions "set ahead". And I feel centers of windows is ok.
    I see window dimensions set from and every wall,
    Then, I see the string broken up and only from wall to wall. (Seems less jumbled to me)
    Is there any rule of thumb that anyone would share?
    Thanks,
    Gary

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    Forum Co-Founder iru69's Avatar
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    Quote Originally Posted by glkirk View Post
    Does anyone know if or what the rule might be as far as dimensioning windows on residential floor plans?
    I know they should be the first string...
    Of course no single "right" way (and every office I've worked at has had these debates multiple times), but what you seem to be suggesting is the way I typically suggest doing it, i.e. first string, from adj wall to center of opening, unless the opening location is self evident (e.g. jamb is flush with a corner, or opening is intended to align with a known element located elsewhere).

    I would only dimension to the opening jamb (and only one side of the opening) if that measurement is critical to the design intent.

    I think dimensioning the actual opening itself on the plans is not the way to go - let the framer look at the door/window schedule and figure out how large to make the opening - keep that their responsibility.

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    Thanks iru69.

    Sorry about the title, it should have read " Dimensioning windows"

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    Forum Co-Founder iru69's Avatar
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    Quote Originally Posted by glkirk View Post
    Sorry about the title, it should have read " Dimensioning windows"
    Ha! I thought was kind of a strange phrasing... hopefully I still addressed what you were asking. (btw, I've primarily focused on residential construction for the last 30 years, and all I know is that everyone seems to have slightly differing opinions on this, but some opinions I've heard make more sense to me and others not so much )

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    Moderator Robin Deurloo's Avatar
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    Quote Originally Posted by glkirk View Post
    Thanks iru69.

    Sorry about the title, it should have read " Dimensioning windows"
    Changed that for you.

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    Moderator Robin Deurloo's Avatar
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    Interesting that you dimension the centre of the window, I have never done that in the almost 20 years that I work in architecture.
    What I usually do is dimension the openings in the wall and their location from a grid. For the exact size of the window compared to the wall opening they can look at the detailing or the windows schedule. I think it is because in Holland we build most residential building in brick and the openings are very important because they are sized according to the brick dimensions.

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    Member FBlome's Avatar
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    Residential, I usually dimension to centerline windows and doors, unless there is a specific side relationship needed. The main reason is we don't know final actual RO until the window order is completed by the GC, and every mfg is different for standard sizing. Years ago we got burned with Marvin, who changed standard sizes after we did the drawings, and it messed up details everywhere. This is not so much a problem now with most windows above the basic lines are made to order.

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    Senior Member DavidLarson's Avatar
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    I prefer to dimension to the center line of windows so the owner and/or client can go do whatever they're going to do. Even make the window bigger and get caught reducing the size of the shear wall without consulting anybody if they could do it.

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    Senior Member PatrickGSR94's Avatar
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    Quote Originally Posted by Robin Deurloo View Post
    Interesting that you dimension the centre of the window, I have never done that in the almost 20 years that I work in architecture.
    What I usually do is dimension the openings in the wall and their location from a grid. For the exact size of the window compared to the wall opening they can look at the detailing or the windows schedule. I think it is because in Holland we build most residential building in brick and the openings are very important because they are sized according to the brick dimensions.
    In the US it is quite common to dimension to centerline of opening, because most construction is framed either out of wood or metal. For masonry construction we do measure to the opening, but for us at least in the Southeastern US, that's not all that common. Also we often specify window units that come in predetermined sizes. The size of the unit dictates the rough opening size, which the contractor and framer need to determine based on what is being installed. That's opposed to something like a custom-built unit made for the opening, or a site-built unit such as aluminum storefront or curtain wall. In those cases we dimension the opening, and leave it up to others to build the unit to the proper size to fit in the opening.
    Last edited by PatrickGSR94; April 15th, 2019 at 09:44 PM.

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    Member d.stairmand's Avatar
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    I'm from New Zealand & down here we dim up the Actual Rough opening Sizes.
    The Pre-cutter has a hard enough time getting everything right & we also need to size the Lintels etc. easy for us to just dim it up.
    Also easier for us to get cladding modules the same for FC sheet & brick

    One thing in using the Centreline Option - How do you Dim to the Centreline of a window shaped like a Triangle or Parallelogram?

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