In current construction, sheetrock, plywood, and fiberboard are used
instead of laths and plaster to cover ceilings.
Cut the panels and treat the joints the same as for walls and partitions,
making sure that joints break on the centers of ceiling joists.
A brace may be constructed
and used to raise and hold a
sheet in place when fitting
and nailing the sheet to the
ceiling joists. Nail sheets with
the lengths going across
ceiling joists to prevent
sagging (Figure 9-10, page 9-
Plywood is hung the same on
ceilings as on walls and partitions
Fiberboard sheets are 1/2 to 2 inches thick. For a smooth cut on these
sheets, use a utility knife. Fiberboard sheets are attached directly to
the joists. To improve ceiling appearance, cover the joints between the
sheets with batten strips of wood or fiberboard. Smaller pieces of fiberboard
(tiles) require furring strips (wooden strips nailed across joints) (Figure
9-11, page 9-10).
Fiberboard sheets also come in small (rectangular or
square) pieces called tiles, which are often used for covering
ceilings They may be made with a lap joint, which permits
blind-nailing or stapling through the edge. They may also
be tongue-and-grooved, fastened with 2d box nails driven
through special metal clips.
For fiberboard tiles that need solid backing, place furring
strips at right angles across the bottom of the joists. Place
short furring pieces along the joists between the furring strips.
Nail metal channels to furring strips and slide the tiles
horizontally into them. In lowering ceilings (usually in older
buildings), metal channels are suspended on wire. Some large
(2 x 4 foot) tile panels are installed in individual frames.
Ceiling moldings are sometimes used at the junction of the
wall and the ceiling to finish the sheetrock paneling
(sheetrock or wood). Inside corners should be coped joints.
This ensures a tight joint even if minor moisture changes
occur. Figure 9-12 shows ceiling molding.
For sheetrock walls, a small, simple molding might be best.
For large moldings, finish nails should be driven into the
upper wallplates and also into the ceiling joist, when possible. (For
plastered ceilings, a cutback edge at the outside of the molding will
partially conceal any unevenness of the plaster and make painting easier
where there are color changes.)