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Sound transmission Coefficient (STC) rating D T the ...

SoundtransmissionCoefficient (STC) ratingD uringgeneralfullscalewalltesting,cellulo seeffectivelyreducestheairbornesoundfrom roomto especiallyimportantforapartments,condomi niums,offices,motels,andhotels, noticeable"quietness".Thesharpsoundsthat easilytransmitthroughnormallyinsulatedst ructuresaresubduedby (STC)ratingis basedonperformancewithfrequenciesfrom125 to 4000 Hertz(thespeechfrequencies)STCP rivacyAchieved25 Normalspeecheasilyunderstood30 Normalspeechaudiblebutnotintelligible35 Loudspeechaudibleandfairlyunderstandable 40 Loudspeechaudiblebutnotintelligible45 Loudspeechbarelyaudible50 Shoutingbarelyaudible55 ShoutingnotaudibleTheSTCof wallassembliescompletewiththeinstallatio nof celluloseinsulationcanbeestimatedby.

ASTMEgO Sound transmission loss ASTME413 Sound transmission loss ASTME1042 Acoustical absorption ASTMC423 Noise reduction coefficients General information courtesy ofNuWool,NationalRber and www.stcratings.com

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Transcription of Sound transmission Coefficient (STC) rating D T the ...

1 SoundtransmissionCoefficient (STC) ratingD uringgeneralfullscalewalltesting,cellulo seeffectivelyreducestheairbornesoundfrom roomto especiallyimportantforapartments,condomi niums,offices,motels,andhotels, noticeable"quietness".Thesharpsoundsthat easilytransmitthroughnormallyinsulatedst ructuresaresubduedby (STC)ratingis basedonperformancewithfrequenciesfrom125 to 4000 Hertz(thespeechfrequencies)STCP rivacyAchieved25 Normalspeecheasilyunderstood30 Normalspeechaudiblebutnotintelligible35 Loudspeechaudibleandfairlyunderstandable 40 Loudspeechaudiblebutnotintelligible45 Loudspeechbarelyaudible50 Shoutingbarelyaudible55 ShoutingnotaudibleTheSTCof wallassembliescompletewiththeinstallatio nof celluloseinsulationcanbeestimatedby.

2 Uninsulatedwoodstuds2x4-16"OC+3 Studs24"OC+5 Metalstuds+31/2"Gypsum+41/2"TypeX Gypsum+45/8"Gypsum+55/8"TypeX Gypsum+23/8"Plywood+31/2"Plywood+45/8"Pl ywood+33/8"OSB+41/2"OSB+55/8"OSB+83 1/2"Celluloseinsulation+145 1/2"Celluloseinsulation+3 ResilientChannelGeneralguidelinesforcont rollingnoisebetweenspaces: Installingcelluloseinsulationwithina 2 x 4 wallcavitywillimprovetheSTCrating,by approximately8 dB,whichis a 2 x 6 wallcavitywilladdapproximately14 dBto theSTCrating. atypical2 x 4 wallwitha singlelayerof 1/2"drywalloneachside(TestedSTC):o CelluloseSTC41o Fiberglassor mineralfiberSTC38o IcyneneSTC37o Theinstalledperformancein battinsulationsystemsis typicallywellbelowthatof theirtestedSTCvalues.

3 Metalstudsperformbetterthanwoodstudsbyab out5db. Staggeringthestudsor usingdualstudscanprovidea substantialincreasein soundisolation. A wallmustextendto thestructuraldeckin orderto droppedceilingwillresultin Soundwilltravelthroughtheweakeststructur alelements,which,manytimes,aredoors,wind owsor "OC,facedonbothsides31/2"41with1/2"gypsu mwallboard2x6stud16"OC,facedonbothsides5 1/2"47with1/2"gypsumwallboardMetalStudAs semblies3 5/8"metalstuds16"OCfacedonbothsideswith5 /8"gypsumwall31/2"48board35/8"metalstuds 24"OCfacedonbothsideswith5/8"gypsumwall3 1/2"51boardASTM standardsfortestingASTMEgOSoundtransmiss ionlossASTME413 SoundtransmissionlossASTME1042 AcousticalabsorptionASTMC423 NoisereductioncoefficientsGeneralinforma tioncourtesyof NuWool.

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