Where the Joists Are
Most ceiling treatments must be anchored to ceiling joists. To locate the joists, look in the attic to see what direction the joists are running and how far apart they are. Mark the location of one by driving a finishing nail along its side. From below, use a stud finder or rap lightly on the ceiling until you hear a solid sound you've found a joist. Locate the edges of the joist by nailing through the ceiling at small intervals. Mark the center, then measure over 16 in. (or the spacing you found in the attic) to find the center point of the next joist. Snap a chalkline along all joists; it will save you time and work later.
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