STEP 5 LAYOUT OF ROOM Treat the room as a rectangle -- disregard offsets, alcoves, etc. Find the center points of the two end walls and snap a chalk line between them. Find the center of the chalk line and, using a carpenter’s square or tile, draw a second chalk line at right angles to the first line and extend it to the side walls. The room is now divided into four equal parts.   Next - Adjustment of border