Running the boards horizontally is pretty much standard but not
mandatory. This from the USG handbook: "Proper planning achieves the
most effective use of materials, elimination of unnecessary joints, and
the placement of necessary joints in the least conspicuous locations.
One gypsum board should span the entire length or width of the wall or
ceiling, if possible. By using the longest practical board lengths
obtainable, end joints are kept to a minimum. Where they do occur, end
joints should be staggered."
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