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2 Mark windows and doors first, then lay out the studs.
Find the center of each window and door opening. Then divide the “rough opening” (given on your plan or in the window literature) by two and measure out to the left and right of the center mark. Write a “T” to the outside of both marks to indicate trimmer locations. Measure over 1-1/2 in. and draw another line. Mark an “X” outside these marks for the full-height king studs.