changes direction. Terminate lath at each side of joint and
fasten joints securely to lath.
3.2.1.5
Unrestrained Ceilings
Furred or suspended ceilings constructed with [gypsum plaster and larger
than 250 square meters 2,500 square feet in area or with any dimension
exceeding 15,800 mm 50 feet] [or] [portland cement-based plaster] shall be
unrestrained. Isolate ceiling lath and plaster from ceiling intersecting
vertical surfaces with casing beads, control joints, or similar devices
designed to keep the ceiling isolated from the adjacent vertical surfaces
(walls, partitions, beams, and columns). Do not use corner reinforcement
at the internal angle between the ceiling and the vertical surfaces.
3.2.1.6
Plastering Beads
Install edge trim (casing bead) [at the edges of plaster which abuts or
adjoins an unplastered surface,] [on each surface at the internal angle
formed by load bearing and non-load bearing walls and partitions abutting
structural walls, columns, or floor-ceiling slabs,] [between concrete or
terrazzo bases and the plaster above them,] [on each side of the joint
between walls or partitions constructed of dissimilar materials which
require plastering,] [and between plasters of a different composition].
Fill voids formed in corners with sealant. Install corner beads at all
vertical external corners of plaster walls.
3.2.2
Fire-Resistant Assemblies
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NOTE: Coordinate with the preparer of the project
drawings to ensure that UL Design Number(s) or GA
File Number(s) are indicated on the drawings for
fire resistant construction.
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Wherever fire-resistant construction is indicated, provide all materials
and application methods, including types and spacing of fasteners, in
accordance with the specifications contained in the [UL Fire Resist Dir for
the Design Number(s) indicated], [or] [GA 600 for the File Number(s)
indicated].
3.2.3
Access Panels
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NOTE: Project drawings or specifications shall
assure that the exact number and location of access
panels can be easily determined. This information
should be shown on the drawings. Coordinate with
mechanical and electrical work to ensure adequate
access to mechanical and electrical systems. Access
panels shall not be installed in fire rated walls or
ceilings unless approved by the Engineering Field
Division's Fire Protection Engineer.
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NOTE: Insert appropriate Section number and title
in blank below using format per UFC 1-300-02.
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SECTION 09205N
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