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Metal Lath All metal lath is installed with the sides and ends lapped over each other. The laps between supports should be securely tied, using 18-gauge tie wire. In general, metal lath is applied with the long length at right angles to the supports. Rib lath is placed with the ribs against the supports and the ribs nested where the lath overlaps. Generally, metal lath and wire lath are lapped at least 1 inch at the ends and 1/2 inch at the sides. Some wire lath manufacturers specify up to 4 1/2-inch end lapping and 2-inch side laps. This is done to mesh the wires and the paper backing. Lath is either nailed, stapled, or hog-tied (heavy wire ring installed with a special gun) to the supports at 6-inch intervals. Use 1 1/2-inch barbed roofing nails with 7/16-inch heads or 1 inch 4-gauge staples for the flat lath on wood supports. For ribbed lath, heavy wire lath, and sheet lath, nails or staples must penetrate the wood 1 3/8 inches for horizontal application and at least 3/4 inch for vertical application. When common nails are used, they must be bent across at least three lath strands. On channel iron supports, the lath is tied with No. 18-gauge tie wire at 4-inch intervals using lathers’ nippers. For wire lath, the hog tie gun can be used. Lath must be stretched tight as it is applied so that no sags or buckles occur. Start tying or nailing at the center of the sheet and work toward the ends. Rib lath should have ties looped around each rib at all supports, as the main supporting power for rib lath is the rib. When you install metal laths at both inside and outside corners, bend the lath to forma comer and carry it at least 4 inches in or around the corner. This provides the proper reinforcement for the angle or comer. Lath Accessories A wide variety of metal accessories is produced for use with gypsum and metal lathing. Lathing accessories are usually installed before plastering to form true corners,  act  as  screeds  for  the  plasterer,  reinforce possible  weak  points,  provide  control  joints,  and provide  structural  support. Lathing  accessories  consist  of  structural  com- ponents  and  miscellaneous  accessories.  The  principal use of structural components is in the construction of hollow  partitions.  A  hollow  partition  is  one  containing no building framing members, such as studs and plates. Structural components are lathing accessories that take the  place  of  the  missing  framing  members  supporting Figure  7-6.—Perforated  flanged  corner  bead. the  lath.  These  include  prefabricated  metal  studs  and floor and ceiling runner tracks. The runner tracks take the place of missing stud top and bottom plates. They usually consist of metal channels. Channels are also used for furring and bracing. Miscellaneous accessories consist of components attached to the lath at various locations. They serve to define and reinforce comers, provide dividing strips between plaster and the edges of baseboard or other trim, and define plaster edges at unframed openings. Comer beads fit over gypsum lath outside corners to provide a true, reinforced comer. They are available in  either  small-nose  or  bullnose  types,  with  flanges  of either solid or perforated (fig. 7-6) metal. They are available  with  expanded  metal  flanges. Casing beads are similar to comer beads and are used both as finish casings around openings in plaster walls and as screeds to obtain true surfaces around doors and windows. They are also used as stops between a plaster surface and another material, such as masonry or wood  paneling.  Casing  beads  are  available  as  square sections,  modified-square  sections,  and  quarter-rounds. Base or parting screeds are used to separate plaster from  other  flush  surfaces,  such  as  concrete.  Ventilating expansion screed is used on the underside of closed soffits and in protected vertical surfaces for ventilation of enclosed attic spaces. Drip screeds act as terminators of   exterior   portland   cement   plaster   at   concrete foundation  walls.  They  are  also  used  on  external horizontal comers of plaster soffits to prevent drip stains 7-7

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