Supplies/Tools -Measuring Tape -Hammer -4 ft. Level -Wood Shims -Grace Window Tape –Roofing nails Step 1 – Check R.O. (Rough Opening), Window Size, and Window Tape Measure the opening in which you plan to set the window. An R.O. (Rough Opening) that is Ã?½ inch to Ã?¾ in bigger than the window is ideal. If … Continue reading How To Set a Window