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All topics » Business & trades » Common carpentry terms (View wiki page) » RR.R.O
R.O. ROUGH OPENING look up translate image
A Carpentry term defining the opening left in a framed wall for a window or door, the window manufacturer will usually provide these for you. General rules of thumb for windows are 1/2" bigger than the windows actual measurements to provide for slight adjustments. Interior doors are 2" bigger than the call out on the door, an example would be 2/8=2/10, exterior doors need to be 2 & 1/2" bigger.