Acoustic Insulation: Sound insulation
refers to the prevention of noise being
transmitted through a construction
element of a building from one space to
another.
The control of sound in rooms of
buildings may be classified with respect
to the origin of the sound-namely.
sounds originating within the room and
sounds originating outside the room.
Efficient and economical control of
sound is dependent not only upon its
origin. but also upon the design of the
enclosure and type of occupancy.
For reduction of sound originating
within a room, the sound absorption
qualities of the walls, ceiling and
flooring as well as furnishings are
important. The type and use of the room
affords the architect latitude in the
selection of sound absorption materials
for elements of the room.
Enclosures with relatively low ceilings.
and rather small exposed wall areas, as
in offices and schoolrooms, the use of
acoustical ceilings, floor coverings,
and interior furnishings might be the
more effective solution
Transmission Loss: Transmission loss is
a measure of the effectiveness of a
wall, floor, door or other barrier in
restricting the passage of sound The
transmission loss varies with frequency
and the loss is usually greater with
higher frequencies
Sound transmission loss measurements are
conducted in accordance with American
Society for Testing and Materials (ASTM)
designation E-90.
Measurements are made at 16 frequencies
in 1/3 octave bands. from 125 to 4000
cycles per second. (cps) (generally
called Hertz. Hz). The unit of measure
of better it functions as a barrier to
the passage of unwanted noise.
Cafcotherm provides high sound
absorption properties. It is used for
application on steel and concrete
frames, coffered or flat concrete
soffits, plastered ceilings, metal
decks, and return air plenums.
Freely curved surfaces may be formed in
expanded metal or rib lath and then
coated with Sound Shield. It may also be
used as a texture coating over hard,
smooth continuous surfaces
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