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Usually standard construction - must be part of the rough opening calculation. Plug toggles must align with flat toggles Headers - refer to the flats at the top of a door, window, wall opening or arch way. Usually standard construction - must be part of the rough opening calculation. Header toggles must align with flat toggles. Door & window Rough opening (R/O) sizes - counting backwards Count back from the inside edge of the door or window jamb adding up the material thicknesses. Then allow 1/2″ over all for shimming. This will leave a 1/4″ gap on all sides for clearance. Jamb - 3/4″ thick - 1/4″x 2 = 1 1/2″ + 1/2″ = 2″ R/O is 2″ larger than the finished opening. 
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