expanded metal wings to provide a key for the plaster. Cover shall be
hinged or snap-on type with turn-latch or spring catch. [Access panels
[for room(s) [_____]] shall be provided with a means for locking.]
Fabricate access panels not larger than 600 by 900 mm 24 by 36 inches from
1.8 mm thick 14 gage steel with frames not lighter than 1.5 mm thick 16 gage.
Fabricate access panels larger than 600 by 900 mm 24 by 36 inches as
indicated. Factory-prime panels with rust-inhibitive paint.
PART 3
EXECUTION
3.1
INSPECTION
Verify that framing, furring and accessories are securely attached and of
proper sizes and spacing necessary to provide a suitable substrate to
receive lath. Do not proceed with work until framing, furring and
accessories are acceptable to the Contracting Officer for application of
lath.
3.2
INSTALLATION
3.2.1
Lathing Materials and Accessories
Install in accordance with [ASTM C 1063 for portland cement-based plaster
work] [and] [ASTM C 841 for gypsum plaster work], except where indicated or
specified otherwise herein.
3.2.1.1
Metal Plastering Base
Install [where indicated] [on wood or metal studding, furring, joists,
rafters, and similar framing members for plastered walls, partitions,
ceilings, and soffits] [to receive scratch coat for ceramic tile or
terrazzo work] [on [concrete] [and] [masonry] surfaces to receive plaster].
3.2.1.2
Metal Plaster Base with Paper Backing
Where used, lap joints to provide backing on backing and metal-on-metal.
Lap backing not less than 25 mm one inch. Lap backing so that water will
flow to the exterior.
3.2.1.3
Gypsum Lath
Install [where indicated] [on wood or metal studding, furring, joists,
rafters and similar framing members for plastered walls, partitions,
ceilings, and soffits].
3.2.1.4
Control (Expansion and Contraction) Joints
a.
For portland cement-based plaster (ceilings and walls), install to
create panels no larger than 10 square meters l00 square feet with
no dimension exceeding 3150 mm 10 feet.
b.
For unrestrained gypsum plaster ceilings install to create panels
no larger than 250 square meters 2,500 square feet with no
dimension exceeding 15800 mm 50 feet. For gypsum plaster walls,
partitions and ceilings without perimeter relief install not more
than 9000 mm 30 feet on centers in either direction.
c.
Install [where indicated,] where expansion joints occur in the
structural walls and ceilings and where ceiling framing or furring
SECTION 09205N
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