Rough framing & bi-fold doors

Discussion in 'Building Construction' started by roy, Nov 26, 2004.

  1. roy

    roy Guest

    I am rough framing a wall in which I want to place a 4 panel bi-fold
    door (i.e. 2 seperate bi-fold doors that swing open in the middle). I
    have looked at bi-folds in the store and note that the door description
    is 24 x 80, which comprises of one door with 2 panels and each panel is
    actually 11.75 inches wide and 78.5 inches tall. If I buy 2 of these 24
    x 80 bifolds, then I would conceivably have what could be described as a
    48 x 80 total bifold.

    Now I am trying to figure out how big the opening in my rough framing
    should be to accomodate such a door. Keeping in mind the actual width of
    each panel is only 11.75 inches, so the total width of all panels is
    only 47 inches. Plus I have to keep in mind the drywall width that will
    be added to the inside of the jamb. So how wide and tall should the gap
    in my rough framing be in this example?

    Is there a standard rule of thumb for rough framing various bi-fold size

    Thanks in advance.
    roy, Nov 26, 2004
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  2. roy

    BP Guest

    The standard rough opening for any prehung door or a door unit with wooden
    jambs and casings is 2.5" larger than the finished opening (from jamb to
    jamb). So for a 48" door opening the rough opening is 51.5". If no wood
    jambs then the finished wallboard opening must be 48".
    Don't overthink the door widths. Bifolds require 1/4" gaps in order to
    function properly. The door opening will need to be 48" unless the
    installation instructions state otherwise.
    BP, Nov 26, 2004
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  3. roy

    Peter James Guest

    In this very room I have 2 x 2 - 15" (nom) bifold doors in one opening.
    Each door is 14.75" wide, there is a nominal 1/4" gap at the outsides,
    and there is a zero to 1/16" gap between the two doors of each pair.
    I used wood jambs - the finished opening is 59 7/8" wide, and that gives
    a slightly oversized gap at the centre.
    It would be tight at 59 3/4" between finished surfaces - OK if
    everything were perfectly true, but no tolerance.

    I suggest you set your own tolerances for finishing the drywall - and
    set the rough framing from there.

    Peter James, Nov 30, 2004
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