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5

The reason for a rough opening is so that it CAN be rough in dimensions. Your opening should be no problem. Rough openings are made larger to accommodate headers and floors than out of level, adjacent studs that may be out of plumb, framing lumber that has thickness variations, openings that are slightly out of square and maybe some other things I've not ...


2

There's a built-in gap in the height and width of the opening. so trimmer/king plumb parallel to the wall's length isn't crucial (to a degree). It's far more critical to get the wall itself plumb perpendicular to the rough opening. Nearly everything else can be shimmed out later, assuming reasonably accurate dimensions. If the wall isn't plumb and flat, ...



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