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What is a rough opening?
A rough opening is the size of the hole that has been framed in.
When a house or a wall is being built, it is easiest to allow for openings for doors and windows while the
wall is still being built. This is for the obvious reason that it's easier to measure and cut something while it's
lying on the ground, than when it's standing upright. The peices that make up the opening can be cut at
stationary tools, and so be more accurately cut.
The rough opening is usually a small bit larger than the size of the actual unit. This is to allow for last
minute aligning of the doors or windows, so that they can be installed squarely. It
makes more sense to get the walls in place first, and to do the picky work later, so that all of the detail work
may be completed consistently.
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