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<br />�,,'%.erve energy by reducing air sound absorbent lining. i
<br />and making it easier to
<br />tr:llntain constant indoor
<br />t,. _,•ratures.
<br />sial or caulk all openings or
<br />tr:lt.ions through walls
<br />;.articularly around water or gas
<br />, i., ,,, electrical cables, and
<br />I.11-igerant lines.
<br />,•, covcr mail slots in doors; install
<br />t,inge(I cover plates on clothes
<br />dryer heat vents, bathroom and
<br />:Itchen exhaust ducts, and central
<br />•uur.1 system dust discharge
<br />Close the fireplace damper,
<br />13,stall close -fitting cover plates
<br />Replace existing hollow -core
<br />st clean-out openings and erect a
<br />I
<br />I -inch (13 mm) thick removable,
<br />1:1 ywOod barrier in front of the
<br />�1
<br />f V
<br />1 ireplace opening.
<br />perimeter gaskets and threshold
<br />x ; : t,•n ,+f the above measures would
<br />seals (see Fig. 4-7).
<br />,•..., t1, round insulation of the exterior
<br />�
<br />til,• house about 6 dB for
<br />1►+(� h
<br />. , • .4.t sotlnd and more than 10 dB for
<br />disturbs your sleep and your
<br />t..! sounds; these measures would
<br />t•,• Iouoness of the intruding noise
<br />C, ;
<br />tL 30 percent, respectively.
<br />'t
<br />located on the opposite side of
<br />the house may reduce the level of
<br />t:., th, Intrusion of Traffic Noise
<br />intruding noise about 10 dB.
<br />t
<br />e�
<br />• %o,. or apartments of conventional
<br />the house that is partially
<br />1
<br />'k:�
<br />tt,u, that aie located very near to
<br />shielded from the noise source
<br />.... .,, tt::vcIcd roadways or expressways are
<br />~
<br />ly v111nerable to the intrusion of
<br />intruding noise about 6 dB.
<br />•- • •.: v, IV 1:101 levels of noise. Since the
<br />Install' barrier wall or fence
<br />Ir)- of existing dwellings may be
<br />�-•
<br />`
<br />• • •� •: ir;,ractical, the occupants should
<br />roadway. To be effective, thF
<br />�•,••r :,elation which provide the
<br />fence should have a solid,
<br />• , reduction at least cost. In
<br />continuous surface without any
<br />c..
<br />tilt recommendations described
<br />1
<br />4;
<br />•• !i., homeowner should incorporate, on
<br />should be relatively long and tall
<br />basis, the following noise
<br />c
<br />ly
<br />co .arcs, until the noise has been
<br />t,
<br />•� • �' t,• rt tolerable level.
<br />the nearest side of the house.
<br />a
<br />`'► It, existing windows install glass
<br />in reducing the level of.
<br />t
<br />9 -nes of double thickness on the
<br />0,141e of the dwelling facing the
<br />11-1,.,• source.
<br />11••4/111 storm windows over the
<br />•I,1[,• windows. Select storm
<br />(4)
<br />Replace existing hollow -core
<br />entrance doors with solid -core,
<br />soundproof doors provided with
<br />perimeter gaskets and threshold
<br />seals (see Fig. 4-7).
<br />(5)
<br />If intruding traffic noise
<br />disturbs your sleep and your
<br />bedroom faces the roadway,
<br />choosing a bedroom which is
<br />located on the opposite side of
<br />the house may reduce the level of
<br />intruding noise about 10 dB.
<br />Selecting a bedroom on the side of
<br />the house that is partially
<br />shielded from the noise source
<br />should reduce the level of the
<br />intruding noise about 6 dB.
<br />(6)
<br />Install' barrier wall or fence
<br />between your house and the
<br />roadway. To be effective, thF
<br />fence should have a solid,
<br />continuous surface without any
<br />openings or holes. The fence
<br />should be relatively long and tall
<br />enough to shield, or hide, the
<br />entire roadway when viewed from
<br />the nearest side of the house.
<br />Such a barrier is most effective
<br />in reducing the level of.
<br />u
<br />high -frequency sounds that travel
<br />in a beam -like manner. Its
<br />��
<br />effectiveness for att.enuati.ng
<br />loan -frequency sounds is limited by
<br />the.ease•.wtth which such sounds
<br />diffract or bend around a barrier.
<br />!'
<br />At best, only a 5 to 10 dB
<br />reduction of the total sound level
<br />can be expected, but the
<br />attEnuation of the high -frequency
<br />sounds may result in an
<br />appreciable reduction in
<br />annoyance. Since the acoustical
<br />'
<br />efficiency of such a barrier may
<br />not be improved by massive
<br />construction, it may as well be
<br />made of relatively light material,.:'
<br />such as 1 -inch (2.5 cm) thick
<br />'
<br />boards.!
<br />,
<br />Reducing the Intrusion of Aircraft Noise
<br />BrIcf intrusions of high-level sounds
<br />are among the most troublesoule to remedy. A 1
<br />
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