members for items mounted in ceiling or attached to ceiling suspension
system. Frames for openings shall be secured to lath support members.
Frames provided with expanded metal flanges shall be secured to lath.
Intermediate structural members shall be provided for attachment or
suspension of support members.
3.9.4
Openings in Hollow Partitions
Hollow partition door openings shall be additionally braced by tying
together each set of double-jamb studs with not less than four solid metal
column clips evenly spaced along each jamb.
3.9.5
Openings in Partitions Not To Structure
Partitions not extending to the structural ceiling or structural supports
or frame shall be strengthened at openings with angle bracing from each
jamb location anchored to the structural ceiling or supports.
3.9.6
Cross Bracing
Cross bracing between partitions or similar bracing may be substituted for
angle bracing as approved. Minor frames such as those required for access
panels may be provided with expanded metal flanges which shall be attached
to lath.
3.10
INSTALLATION OF TRIM, MOLDINGS, AND ACCESSORIES
Trim, moldings, and accessories shall be installed in standard lengths
level and plumb to straight lines and as indicated on drawings. Fastenings
shall be spaced not over 300 mm 12 inches on centers for single-flanged
accessories and not over 600 mm 24 inches on centers on each flange of
double-flanged accessories. Items shall be mitered or coped at corners, or
prefabricated corners shall be used. Joints in straight runs shall be
formed with splice or tie plates.
3.10.1
Base Screeds
Base screeds shall be installed approximately 75 mm 3 inches above finished
floor elevation unless indicated otherwise.
3.10.2
Corner Beads
Corner beads shall be installed in standard lengths at external plastered
corners, and shall be secured to furring members or supports.
3.10.3
Cornerites
Cornerites shall be installed at internal angles formed by abutting
surfaces of gypsum lath or metal lath not turned down at horizontal corners
or returned around vertical corners. Cornerites shall be secured to lathed
surfaces. Cornerites shall be secured to concrete or masonry where plaster
is applied directly to concrete or masonry surfaces. Cornerites shall not
be installed at unrestrained ceilings.
3.10.4
Casing Beads
Casing beads shall be installed at the joints of dissimilar base materials
in the same plane and at exposed edges of plaster including junctions of
walls and ceilings except that beads shall not be installed at restrained
SECTION 09200A
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