When strapping a flat ceiling, begin at one corner of the ceiling where the ceiling meets the wall.
Start strapping the ceiling in each room from the same side of the house. You will later begin hanging drywall from the same side of the house. This will ensure your 16" on center measurements.
Cut the first piece of strapping so that one end starts at the corner and the other ends at the center of a ceiling rafter.
Place the piece of strapping against the ceiling, wall, and corner.
Nail the strapping to each rafter using 2 to 3 nails at each intersection.
Butt the second piece to the end of the first piece and nail it to the center of the that rafter.
Continue in this manner until you have reached the other corner of the room.
The center of the second row of strapping must be 16" from the center of the row you have just installed. You must calculate the propper distance between the first and second row depending on the width of the strapping you have purchased.
Subtract 1/2 the width of the strapping from 16" to calculate the distance of the second row from the first row.
If your strapping is 2 1/2" in width, you must install the second row 14 3/4" from the first row.
Any additional rows will be installed 16" from the previous one.
Continue installing rows until you have reached the opposing wall.
Be sure to install the last row along the intersection of the wall and ceiling even if it is less than 16" from the previous row.