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1 Snap lines and set the plates in place.
Eliminate mistakes by chalking a full-size map of your walls directly on the floor. First mark the inside edge of the wall at each corner and snap chalk lines. Mark the location of interior walls as well and snap chalk lines on both sides of interior wall locations to ensure correct plate positions. Double-check all of your layout lines to make sure the walls are parallel, the corners are at right angles and the dimensions match the plans. Then measure and cut a top and bottom plate for each wall as shown. Double-check lengths by setting the plates in their exact position.