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Acoustical treatment shall consist of sound controlling units mechanically
mounted on a ceiling suspension system. The unit size, texture, finish,
and color shall be as specified. The Contractor has the option to
substitute inch-pound (I-P) Recessed Light Fixtures (RLF) for metric RLF.
If the Contractor opts to furnish I-P RLF, other ceiling elements like
acoustical ceiling tiles, air diffusers, air registers and grills, shall
also be I-P products. The Contractor shall coordinate the whole ceiling
system with other details, like the location of access panels and ceiling
penetrations, etc., shown on the drawings. If I-P products are used, the
Contractor shall be responsible for all associated labor and materials and
for the final assembly and performance of the specified work and products.
The location and extent of acoustical treatment shall be as shown on the
approved detail drawings. Reclamation of mineral fiber acoustical ceiling
panels to be removed from the job site shall be in accordance with
paragraph RECLAMATION PROCEDURES.
1.3.1
Fire Resistive Ceilings
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NOTE: Certified laboratory test reports for fire
resistance rating and ceiling attenuation class
(CAC) cannot be obtained for ceiling assemblies
which are nonstandard with the manufacturer.
Therefore, where a fire resistance rating and/or
ceiling sound transmission class are necessary, do
not specify a nonstandard ceiling assembly. Refer
to data in the UL Fire Resistance Directory for
details.
For Navy projects, delete this paragraph when fire
separation is not required by Mil HDBK-1008, Fire
Protection for Facilities Engineering, Design, and
Construction. Where required, rating applies to
total floor-ceiling or roof-ceiling assembly,
including mechanical-electrical elements,
penetrations, structural system, and deck. If
system is required to be fire-endurance rated, show
details of recessed fixture enclosures and other
penetrations on drawings.
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Acoustical ceiling systems indicated as fire resistant shall be rated for
fire endurance as indicated when tested in accordance with ASTM E 119.
Suspended ceiling shall have been tested with a specimen [roof] [floor]
assembly representative of the indicated construction, including mechanical
and electrical work within ceiling space openings for light fixtures, and
air outlets, and access panels. Ceiling assembly rating shall be [[1]
[1-1/2] [2] [3] [4] hour [concealed grid system] [exposed grid system]] [as
shown on drawings]. Flame spread of acoustical units shall be 25 or less
and smoke development shall be 50 or less when tested in accordance with
ASTM E 84.
1.3.2
Ceiling Attenuation Class and Test
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NOTE: Ensure that CAC rating chosen is coordinated
with rating of walls detailed on the drawings. It
SECTION 09510
Page 8
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