| CEILINGS
Ceiling joists form the framework of the ceiling of the room.
They are usually lighter than floor joists but must be large
enough and strong enough to resist bending and buckling.
Ceiling joists are usually installed 16 inches or 24 inches on
center, starting at one side of the building and continuing
across, parallel to the rafters (Figures 6-45 and 6-46). Extra
joists, if needed, may be placed without affecting the spacing
of the prime joists.
Selecting and installing the ceiling joists are much the same as for
floor joists. Ceiling joists are nailed to both the plates and the rafters,
if possible, and lapped and nailed over bearing partitions. Joists that
lie beside rafters on a plate are cut at the same pitch as the rafter,
flush
with the top of the rafter. Joists are installed crown or camber up.
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