CEILING
4-6.5 SOUND ATTENUATION: A
s u s p e n d e d ceiIing acts as a plane
o f sound separation between spaces.
W h e n partitions do not penetrate
t h e c e i l i n g , the ceiling plane
becomes the critical sound attenu-
ation element.
Note that the attenuation capability
o f the ceiling plane need only be
approximately one-half that of the
p a r t i t i o n s , s i n c e sound must travel
through two ceiling planes. (1)
Other critical aspects of ceiling
sound attenuation include the
presence of openings in the ceil-
ing (return air registers for
example) and the effectiveness of
partition head attachment in ensur-
i n g that sound cannot leak over the
top of the partition. (2)
4-6.6 SOUND ABSORPTION: The
:
ceiIing provides a large area for
the absorption of sound. Quiet
s p a c e s and dining areas should use
highly absorbent ceiling materials.
L a r g e multi-use rooms should be
analyzed by an acoustical engineer
to provide criteria for absorption
s t a n d a r d s and material recommendations.
4 - 6 . 7 INTEGRATED CEILING SYSTEMS:
Pre-engineered ceiling systems are
avaiIable
in
which
ceiIing
materials
are integrated with lighting fix-
tures, air diffusers, and sometimes
s p r i n k l e r h e a d s . M o s t assemblies
offer a selection of ceiling/light-
i n g types including three dimensional
coffers,
Iuminous ceiling, and flat
p a n e l s to receive surface mounted or
recessed fixtures.
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