3.1.4
Caulking
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NOTE: Specify caulking only when the space above
the ceiling will be used as an air plenum, or when
required to reduce sound transmission between rooms.
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Seal all joints around pipes, ducts or electrical outlets penetrating the
ceiling. Apply a continuous ribbon of acoustical sealant on vertical web
of wall or edge moldings. See Section 07920 JOINT SEALANTS.
3.1.5
Adhesive Application
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NOTE: Adhesive method of application should not be
used for new construction. It may be used for
application to existing ceiling surfaces in remodel
work. Tiles larger than 300 x 600 mm (12 x 24
inches) should not be attached by the adhesive
method.
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Wipe back of tile to remove accumulated dust. Daub acoustical units on
back side with four equal daubs of adhesive. Apply daubs near corners of
tiles. Contact area of each daub shall be at least 50 mm 2 inches diameter
in final position. Press units into place, aligning joints and abutting
units tight and uniform without differences in joint widths.
3.2
CEILING ACCESS PANELS
Ceiling access panels shall be located directly under the items which
require access.
3.3
CLEANING
Following installation, dirty or discolored surfaces of acoustical units
shall be cleaned and left free from defects. Units that are damaged or
improperly installed shall be removed and new units provided as directed.
3.4
RECLAMATION PROCEDURES
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NOTE: If the job requires removal of acoustical
ceiling systems, or acoustical units are left over
from new construction, the decision to recycle must
be weighed against the cost of packaging and
transportation, especially in remote areas. Most
mineral fiber ceilings can be recycled. The
following ceiling tiles cannot be recycled: 1)
Faced materials (vinyl faced, mylar, metal faced).
2) Molded or cast ceiling products and glue up
ceiling tiles (either 305 by 305 mm (12 x 12 inches)
or 305 by 610 mm (12 by 24 inches) panels). 3)
Fiberglass panels. 4) Ceramic based tiles. 5) Some
proprietary products.
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Ceiling tile, designated for recycling by the Contracting Officer, shall be
SECTION 09510
Page 22
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