acoustical-assemblies-en-SA200

User’s GuideThis brochure provides:— Comprehensive information about strategies for enhancing acousticsand sound control— Guidelines for selecting USG products and systems to meet acousticalneeds in a range of applications— Technical information and test data for featured products and systemsPagesIntroduction Overview4DefinitionsComponentsSystems Overview11Performance TestingSystems Design Performance Selector14Design DetailsFlanking Path DetailsGood Design PracticesFor More InformationTechnical Service800 USG.4YOUWeb Sitewww.usg.com3 USG Acoustical Assemblies

OverviewAcoustics affect critical aspects of a building’s function, from productivityin office settings and performance quality in theaters and auditoriums,to the price an apartment, condominium or single-family house cancommand. Understanding how to select a combination of buildingmaterials, system designs and construction technologies that will providethe most appropriate sound control is key to creating a successfulacoustical design.While the science behind sound is well understood, using that science to create the desired acoustical quality withina building or room is complex. No single acoustical “solution” can be universally applied to all designs. Each environmentfeatures unique parameters the architect and designer must consider when developing floor plans, selecting materialsand designing assemblies. Virtually every material—from furniture and wall and floor coverings to computer equipment—will affect sound to some degree. However, designing wall partitions, ceiling systems and floor/ceiling assembliesfor the distinct qualities of a space will achieve the most effective sound control.Sound is defined as a vibration in an elastic medium, that is, any material (air, water, physical object) that returnsto its normal state after being deflected by an outside force such as a sound vibration. The more elastic a substance,the better it can conduct sound. Lead, for instance, is very inelastic and therefore a poor sound conductor. Steel, onthe other hand, is highly elastic, making it an excellent conductor of sound.Sound travels not only in a straight path from its source but also bounces off partitions, bends around barriersand squeezes through small openings, all of which can allow noise to reach surprisingly far beyond its point of origin.Designers must consider the dynamics of sound when determining how they will control noise within a building.4 USG Acoustical Assemblies

DefinitionsLike most specialized fields, the science of acoustics has a languageall its own. Some of the most important terms and concepts to be familiarwith include:AbsorptionPercentage of sound waves that a material transforms into heat energy and thereby does not reflect back into the space.Articulation index (AI)A measurement of how well speech can be understood in a space. High AI is desirable in spaces such as auditoriumsand theaters and can be achieved with a combination of materials and design details that strategically reflect andabsorb sound. Reduced AI is desirable for spaces such as open offices, where many people must work independently,and in financial and healthcare facilities, which are subject to federal privacy rules; sound masking can be used toreduce AI (see the next page for more information).Ceiling AttenuationClass (CAC)A measurement of the ability of a ceiling panel to block the travel of sound from an enclosed room up into the plenumand down to adjacent spaces. High-CAC ceiling panels can provide this type of sound control, increasing speechprivacy in private spaces and reducing distractions to those outside.ConductivityThe ability of a material to transmit sound waves. In addition to moving through air, sound waves can travel even moreeasily through many solid objects. For example, sound waves move through air (70 ˚F) at just 1,128 feet per secondbut travel about 10 times faster (11,700 feet per second) through wood, and faster still (18,000 feet per second) throughsteel. Therefore, designers must consider not only airborne sound, such as voices and ringing telephones, but alsostructure-borne sound created by footfall, doors opening and closing, and building systems such as elevator machineryand HVAC equipment.DiffractionThe bending of sound waves around objects or through small spaces and openings with little energy loss. Spacesaround doors, floor tracks, electrical boxes, and conduit and HVAC ducting are typical channels for sound diffraction.These spaces should be filled with acoustical sealant to prevent unwanted sound from intruding into adjacent spaces.Flanking PathsSmall gaps and openings around doors, floor tracks, electrical boxes, and conduit and HVAC ducting that allow soundto pass through if not filled with acoustical sealant. Also called “leaking paths.”Impact IsolationClass (IIC)Measurement of the ability of a floor/ceiling assembly to isolate sound from footfall and other impact sources,reducing the intrusion of noise into rooms directly below.Noise ReductionCoefficient (NRC)Measurement of the ability of a material such as an acoustical ceiling panel to absorb sound energy in the frequencyrange of 250 Hz to 2,000 Hz (see “pitch” for more information). High-NRC ceiling panels provide this type of soundcontrol, which is important for large spaces such as open-plan offices.5 USG Acoustical Assemblies

DefinitionsPitchThe oscillation rate of a sound wave, which travels as a small pressure change alternating above and below the static(at rest) state of the conducting material. Each cycle of compression and re-expansion is a wave. The number ofwaves occurring per second is the frequency, which is measured as hertz (Hz); one Hz equals one cycle per second.A sound’s pitch rises as its frequency increases. The human ear can discern sounds ranging from approximately20 Hz to 20,000 Hz. Human speech ranges between 125 Hz and 4,000 Hz.ReflectionThe bouncing of sound waves off any hard, smooth wall, ceiling or floor surface, making them audible beyond theimmediate area of the source. The shape of surfaces also affects where sound may travel. Concave surfacesconcentrate or focus sound, while convex surfaces can disperse sound in multiple directions.ReverberationSound that persists in an enclosed space by reflecting off surfaces in the room.Sound MaskingA carefully engineered sound spectrum similar to that of softly blowing air, which is amplified through speakers to raisethe ambient sound level, “masking” conversations and background noise. In enclosed rooms, sound masking increasesspeech privacy by lowering the articulation index, preventing conversations from being overheard.Sound TransmissionClass (STC)Measurement of the ability of a wall or floor assembly to isolate airborne sound and prevent it from passing from oneside to the other.TransmissionThe passage of sound waves from its source, through a vibrating medium, and to a listener. “Airborne sound” passesthrough a space by vibrating the air. “Structure-borne sound” travels through wall partitions, ceilings and floor/ceilingassemblies.VolumeThe loudness of a sound—how much the amplitude of a sound wave exceeds the static pressure of the conductingmedium—as measured in decibels (dB). The higher the decibel level, the greater the volume. Noise from a jet planehas an amplitude of 140 dB, while a human whisper is approximately 20 dB. Sound in a typical office environmentreaches 40 dB to 60 dB. Volume doubles with each 10 dB increase in sound energy.6 USG Acoustical Assemblies

ComponentsAcoustically-rated systems have been comprehensively tested for soundcontrol. Substitution of any components is not recommended orsupported by USG. Refer to the material safety data sheet for eachproduct for complete health and safety information.CeilingsUSG Acoustical Ceiling Panels– Available with high NRC, CAC, and combination NRC/CAC ratings– Provide stylish and effective sound control in a full range of commercial applications including retail, healthcare,hospitality, educational and office settings– Combine top-rated acoustical performance with durability, high light reflectance and a range of textures tocomplement any décor– Many feature the ClimaPlus Non-Sag Warranty– Cast ceiling panels provide unparalleled strength and integral color to mask nicks and scratches for long service lifeand low lifecycle costs– Select panels provide antimicrobial treatment for true protection against moldFor more information see the following brochures:Ceiling Systems BinderSC2392Ceiling Systems Desktop ReferenceSC2000LENCORE ® SPECTRA ® Sound Masking– Covers ambient noise in large spaces so potential distractions are less intrusive– Enhances speech privacy in private offices by preventing conversations from being overheard outside– Adds acoustical balance to exceptionally quiet environments– Each unit is powered by 16/18 volts AC and includes a self-contained noise generator, audio amplifier, loudspeaker,and power supply unit in an aluminum enclosure– Supports an optional paging system– Allows paging and masking volume to be adjusted independently, and additional central control capabilitiesare availableFor more information see the following brochures:The Acoustics SolutionWill You Achieve HIPAA Compliance?SC2411SC24127 USG Acoustical Assemblies

ComponentsWalls and PartitionsSHEETROCK ® Brand Gypsum Panels– Available in thicknesses of 1/4 to 3/4 for assembling interior partitions with one or more layers per side for effectivesound control in any application– Steel-framed resilient partition systems with sound attenuation fire blanket (SAFB) in the partition cavity can achieve upto 65 STC with multi-layer designs, up to 63 STC with double-layer designs, and up to 56 STC with single-layer designs– Wood-framed resilient partition systems with SAFB can achieve up to 59 STC with double-layer designs and up to50 STC with single-layer designs– Have achieved up to 4-hr. fire-resistance ratings with 3/4 ULTRACODE ® Core panels in steel-framed partition assembliesFor more information see the following brochures:Moisture-Resistant AssembliesSA932SHEETROCK Gypsum Panels Submittal SheetWB1473Aesthetic AssembliesSA933USG Area Separation Walls– Achieve up to 60 STC– Offer 2-hr. and 3-hr. fire-resistance ratings; comply with fire-resistance requirements under evaluation reports of UL U336– Weigh at least 50% less than masonry walls, allowing faster, easier installationFor more information see the following brochures:Area Separation Wall SystemsSA925Area Separation Wall Submittal SheetWB2129SHEETROCK Shaft Wall Systems– Tested systems achieve up to 58 STC– Have achieved up to 4-hr. fire-resistance ratings with multi-layer designs (UL U415)– Oscillation tested to 1 million cycles to ensure structural performance– Feature panels with water-resistant facings and/or mold-resistant paper and a water-resistant core to help minimize therisk of moisture damageFor more information see the following brochures:Shaft Wall SystemsSHEETROCK Gypsum Liner Panels Submittal SheetSA926WB22788 USG Acoustical Assemblies

Plaster Systems– Veneer plaster partitions achieve up to 63 STC in steel-framed resilient systems and up to 52 STC in wood-framedresilient systems– Have achieved 1- to 4-hr. fire-resistance ratings for veneer and conventional systems– Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywallconstruction, plus lower lifecycle costs and greater sustainability– Used in theaters and auditoriums to create reflective surfaces near the stage to reinforce soundFor more information see the following brochure:Plaster Wall SystemsSA920SHEETROCK Acoustical Sealant– Helps ensure that partition sound performance matches the promise of sound tests by sealing off spaces atpartition perimeters and around cutouts– Can increase the STC rating of a double-layer, steel-framed partition from 29 to 53 STC– An integral part of high-performance USG partition designs for attenuation of low-frequency sound from machineryand music– Suitable for use at the perimeter of fire-rated wall assembliesFor more information see the following brochure:SHEETROCK Acoustical Sealant Submittal SheetJ678MICORE ® Mineral Fiber Board– A quality substrate or core for upholstered sound-absorbing wall panels, office dividers and baffles– Available in thicknesses of 3/8 to 3/4, with 24-28 STC and .25-.35 NRC– Nearly 50% lighter than particle board for easy handling and lower freight rates– Inorganic mineral fibers won’t absorb moisture, preventing expansion and warping– Class A flame spread ratings developed per ASTM E84; UL classification– Provides very low VOC emissions, per ASTM D5116-97– Meets requirements for classrooms, per Collaborative for High-Performance Schools (CHPS), Section 01350For more information see the following brochures:MICORE 300 Board Submittal SheetMICORE 160 Board Submittal SheetIW803IW9449 USG Acoustical Assemblies

ComponentsFloor/Ceiling AssembliesLEVELROCK ® Floor Underlayment– Low-profile leveling gypsum concrete system increases IIC ratings by as much as 13 points when used withLEVELROCK SRB sound reduction board or SRM-25 sound reduction mat– Improves sound control in nominal wood-joist, engineered I-joist, open-web truss, and concrete floor systems– Provides 1- and 2-hr. fire-resistance ratings for wood-framed floor/ceiling assemblies, and 4-hr. ratings for precastconcrete assemblies– Available in an unmatched range of compressive strengths from 2,500 to 8,000 psiFor more information see the following brochures:Floor Underlayment SystemsSA305High-Strength Flooring SolutionsIG1503SRM-25 Sound Reduction Mat– Low 1/4 profile allows use of the full range of flooring finish materials including hardwood, ceramic tile, and marblewith smooth transitions between surfaces– Elevated on small nodes so less than 5% of surface area makes direct contact with the subfloor– Increases STC rating by 4-7 points and IIC rating by 8-13 pointsFor more information see the following brochure:LEVELROCK SRM-25 Sound Reduction Mat Submittal SheetIG1619SRB Sound Reduction Board– Smooth, coated finish resists abrasion and maintains tight tolerance– Just 3/8 thick; allows flexibility in choosing flooring materials– Increases STC rating by 2-3 points and IIC rating by 5-8 pointsFor more information see the following brochure:LEVELROCK SRB Sound Reduction Board Submittal SheetIG152310 USG Acoustical Assemblies

Performance TestingTesting provides a measurement of maximum performance potentialachieved under controlled laboratory conditions. The actual abilityof partitions and assemblies to control sound in real-life applications,however, depends on their design and the methods used to installthem. Deviations from the detailing shown in this publication, substitutionof components, or damage and improper repair or maintenance couldseverely reduce the acoustical performance of these installations.Testing MethodsAll USG products and systems undergo exhaustive testing to ensure that they meet exacting standards. USG’s productsare Classified as to fire resistance and fire-hazard properties. As part of this protocol, Underwriters Laboratories (UL)periodically audits production of these materials to ensure compliance with necessary properties. UL is an independent,not-for-profit organization that has tested products for public safety for over a century.Products are manufactured and tested in accordance with recognized standards. ASTM International is one of thelargest voluntary standards development organizations in the world, and is a trusted source for technical standardsfor materials, products, systems, and services.Testing ResultsASTM C423Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method measures Noise ReductionCoefficient (NRC). This rating represents the average of a given material’s sound absorption coefficients at fourfrequencies from 250 Hz to 2000 Hz.ASTM E1414Determination of Sound Transmission Class by the Two-Room Method measures Ceiling Attenuation Class (CAC), thesound reduction in decibels provided between rooms with a shared ceiling and common plenum. This rating representsthe average of the sound attenuation at four frequencies from 250 Hz to 2000 Hz.Acoustical Ceilings Panels NRC CAC CAC with LENCORESound Masking aECLIPSE CLIMAPLUS .70 35 45FROST CLIMAPLUS .70 40 50HALCYON CLIMAPLUS .90 30 40MARS ® CLIMAPLUS .70 35 4511 USG Acoustical Assemblies

Performance TestingASTM E90Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions andElements measures Sound Transmission Class (STC), the acoustical isolation provided by a barrier material or partitionassembly. This rating represents the average of the sound attenuation between two spaces at four frequencies from250 Hz to 2000 Hz.Walls and PartitionsSHEETROCK Brand Gypsum PanelsPartition Type UL Designs Framing b Max. STCMulti-Layer U419, U455 Steel/Resilient Channel 65Double-Layer U419, U454 63Single-Layer U419, U451 56Double-Layer U334 Wood/Resilient Channel 59Single-Layer U311 50USG Area Separation WallsWall Type UL Designs STC (Tested Assemblies)Solid U336 46 to 60SHEETROCK Shaft Wall SystemsNail Type UL Designs STC (Tested Range)Cavity U415 39-58Veneer Plaster SystemsFraming UL Designs STC (Tested Assemblies)Non-loadbearing Steel U411, U412, U419, 40-59U435, U448, U455Non-loadbearing U419, U423, U440, 50-63Steel/Resilient U451, U452, U453,U454Wood U305, U314 34-46Wood/Resilient U311 49-52Mineral Fiber BoardMICORE 300 BoardMICORE 160 BoardThickness STC NRC STC NRC3/8 24 .25 22 —7/16 24 .25-.30 — —1/2 25 .30-.35 24 .30-.405/8 26 .30-.35 26 .30-.403/4 28 .30-.35 26 .55-.60Notes(a) LENCORE sound masking adds the equivalent of 10 points of CAC by increasing ambient background sound by 10 dB.(b) Includes SAFB in the partition cavity.(c) Performance shown for perforated products.12 USG Acoustical Assemblies

ASTM E492Standard Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling AssembliesUsing the Tapping Machine determines Impact Isolation Class (IIC), the ability of a floor/ceiling assembly to isolate noisefrom footsteps and other impact sources. This performance is tested using a tapping machine that impacts the floor ofa “source” room and measuring the amount of sound that comes through the ceiling of a “receiving” room locateddirectly below.Floor/Ceiling AssembliesLEVELROCK Floor UnderlaymentSound Isolation SystemFraming Sound Barrier Floor Finish IIC STCI-Joist SRM-25 Sound Carpet 77 65Reduction Mat Sheet Vinyl 55-58 60-64Ceramic Tile 54-56 60-66Wood Laminate 52-54 60-64I-Joist SRB Sound Wood Laminate 61 65Reduction Board Ceramic Tile 51 65Sheet Vinyl 54 65Truss SRM-25 Sound Carpet 73 61Reduction Mat Ceramic Tile 56 61Sheet Vinyl 55 61Truss Carpet 76 58Sheet Vinyl 48 5813 USG Acoustical Assemblies

LegendThis legend contains the symbolsused throughout the ArchitecturalReference Library to representvarious architectural elements.Profile and cross-section views areshown where appropriate, alongwith architectural material symbols.Architectural ElementsArchitectural ElementsComponent Cross Section Profile Component Cross Section Architectural Material SymbolsC-H studsZ-furringEngineeredPolystyreneinsulationBlanketinsulationSolid walljoistPlywoodDeckingCement boardDeckingPoured gypsumLathWood trussGypsum boardor plasterVeneer finishWood joistor studSteel joistor studTileConcrete orprecast concreteCeiling panelSteel trussRC-1 channelFurring channel14 USG Acoustical Assemblies

APartitionsSteel FramedNon-loadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Indexwt. 6 • 5/8 SHEETROCK ® Brand FIRECODE ® Core 40 USG-8608081 hour UL Des U419 SA700 A-1Gypsum Panels or IMPERIAL ® Brand or U465 SA9204 7 ⁄8"FIRECODE Core Abuse-Resistant49 SA-870717Gypsum Base, FIBEROCK ® Brand Panels Based on 3 SAFB in cavity– 3-5/8 25 gauge steel studs 24 o.c.– joints finished• optional veneer plaster51 RAL-TL-90-166Based on 5/8 FIRECODE C Corepanels and 3 SAFB, and veneerfinish surface SAFB 25 wide,creased to fit cavitywt. 7 • 1/2 SHEETROCK Brand FIRECODE C Core 41 RAL-TL-69-1481 hour UL Des U419 SA920 A-2Gypsum PanelsBased on same constructionor U4484"– 2-1/2 25 gauge steel studs 24 o.c.– 1-1/2 THERMAFIBER SAFB– joints finished50without THERMAFIBER SAFBSA-800504wt. 7 • Face layer 1/2 SHEETROCK Brand 53 CK-684-131 hour GA-WP-1090 A-33 1 ⁄8"FIRECODE C Core Gypsum Panels–1-5/8 25 gauge steel studs 24 o.c.• base layer 1/4 SHEETROCK BrandGypsum Panels– joints finishedBased on 1-1/2 mineral woolbatt and 2-1/2 studswt. 7 Alternate based on 2-1/2 25 gauge 53 NGC-23181 hour GA-WP-1051 A-4steel studs and 1/2 face layerBased on 2 glass fiber3 1 ⁄8"laminatedwt. 5 • 1/2 SHEETROCK Brand FIRECODE C Core 50 RAL-TL-87-1561 hour UL Des U419 SA920 A-5Gypsum Panelsor U4515 1 ⁄8"– 3-5/8 25 gauge steel studs 24 o.c.–3 THERMAFIBER SAFB– RC-1 channel or equivalent one sidespaced 24 o.c.• optional veneer plaster54 RAL-TL-83-216Based on 5/8 thick panelsclg. wt. 5 • 1/2 SHEETROCK Brand FIRECODE C Core 56 RAL-TL-87-1391 hour UL Des U419 SA920 A-6Gypsum Panelsor U4517 1 ⁄2"–6 20 gauge steel studs 24 o.c.–5 THERMAFIBER SAFB– RC-1 channel or equivalent one sidespaced 24 o.c.56 RAL-TL-84-141Based on 5/8 thick SHEETROCKBrand FIRECODE C Core GypsumPanelswt. 14 • 1/2 DUROCK Brand Cement Board and 48 SA-8403211 hour UL Des U442 SA934 A-75 1 ⁄8"1/4 ceramic tile– 3-5/8 20 gauge steel studs 16 o.c.–3 THERMAFIBER SAFB– alternate design 5/8 SHEETROCK BrandFIRECODE Core Gypsum Panels,one side50 SA-840313Based on alt design15 USG Acoustical Assemblies

APartitionsSteel FramedNon-loadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Indexwt. 7 • 1/2 SHEETROCK Brand FIRECODE C Core 58 RAL-TL-83-2151-1/2 UL Des U452 SA920 A-8Gypsum Panelshour5 5 ⁄8"– 3-5/8 20 gauge studs 24 o.c.–3 THERMAFIBER SAFB– RC-1 channel or equivalent one sidespaced 24 o.c.– 2 layers gypsum panels– face layer joints finished• optional veneer plaster59 RAL-TL-84-1406 20 ga struc studs and 5THERMAFIBER SAFBwt. 9 • 1/2 SHEETROCK Brand FIRECODE C Core 50 USG-8408172 hour UL Des U419 SA920 A-9Gypsum Panels each sideBased on 3-5/8 stud assemblyor U4123 5 ⁄8"– 1-5/8 25 gauge steel studs 24 o.c. without mineral wool batt– face layer joints finished• optional veneer plaster52 SA-860932Based on lamin. face layer,1-1/2 mineral wool batt and2-1/2 studs54 CK-654-40Based on 2-1/2 studs, screwattachedface layer and 1-1/2mineral wool batt55 SA-800421Based on 3-5/8 studs and1-1/2 mineral wool battwt. 11 • 5/8 SHEETROCK Brand FIRECODE Core 48 BBN-7704082 hour UL Des U419 SA920 A-10Gypsum Panels, or FIBEROCK Brand Panels Based on 3-5/8 studs andor U4115"– 1-5/8 25 gauge steel studs 24 o.c. 5/8 SHEETROCK Brand FIRECODE C Core– face layer joints finishedGypsum Panels• optional veneer plaster56 USG-840818Based on 3-5/8 studs and3 mineral wool battwt. 7 • 3/4 SHEETROCK Brand ULTRACODE Core 50 USG–9106172 hour UL Des U419 A-11Gypsum Panelsor U4915"– 3-1/2 25 gauge steel studs 24 o.c.–3 THERMAFIBER SAFB– joints finishedwt. 7 • 1/2 SHEETROCK Brand FIRECODE C Core 59 RAL-TL-84-1362 hour UL Des U419 SA920 A-12Gypsum PanelsBased on 5/8 thick panels,or U4535 5 ⁄8"– 3-5/8 20 gauge studs 24 o.c.–3 THERMAFIBER SAFB– RC-1 channel or equivalent one sidespaced 24 o.c.– single-layer gypsum panels screwattachedto studs– double layer screw-attached to channel– face layer joints finished• optional veneer plaster606 20 gauge structural studs,5 mineral wool battRAL-TL-87-140Based on 1/2 thick panels,6 20 gauge structural studs,5 mineral wool batt16 USG Acoustical Assemblies

Steel FramedNon-loadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Indexwt. 9 • 1/2 SHEETROCK Brand FIRECODE C Core 57 USG-8712072 hour UL Des U454 SA920 A-13Gypsum PanelsBased on 5/8 thick panels5"– 2-1/2 25 gauge steel studs 24 o.c.–1 THERMAFIBER SAFB60 RAL-TL-87-154– RC-1 channel or equivalent one side,spaced 24 o.c.– double layer gypsum panels screwattachedto channel, 2 layers screwattachedto steel studs– face layer joints finished• optional veneer plaster6163RAL-TL-83-214Based on 5/8 thick panelsRAL-TL-87-141Based on 6 20 gauge structuralstuds and 5 mineral wool batt62 RAL-TL-84-139Based on 5/8 thick panels,6 20 gauge structural studs and5 mineral wool battwt. 18 • 1/2 DUROCK Brand Cement Board and 56 SA-8510162 hour UL Des U443 SA934 A-146 1 ⁄8"1/4 ceramic tile• base layer 1/2 SHEETROCK BrandFIRECODE C Core Gypsum Panels– 3-5/8 20 gauge steel studs 16 o.c.–3 THERMAFIBER SAFB– face layer joints taped• alternate design 2 layers 1/2 SHEETROCKBrand FIRECODE C Core Gypsum Panels,one side58Based on alternate designSA-851028wt. 13 • 1/2 SHEETROCK Brand FIRECODE C Core 59 SA-8301123 hour UL Des U419 SA920 A-15Gypsum PanelsBased on assembly with 1-1/2or U4354 5 ⁄8"– 1-5/8 25 gauge steel studs 24 o.c. mineral wool batt in cavity• optional veneer plasterwt. 11 • 1/2 SHEETROCK Brand FIRECODE C Core 61 RAL-TL-87-1533 hour UL Des U419 SA920 A-16Gypsum PanelsBased on 5/8 thick panelsor U4556 5 ⁄8"– 3-5/8 20 gauge studs 24 o.c.–3 THERMAFIBER SAFB– RC-1 channel or equivalent one side,spaced 24 o.c.– face layer joints finished6263RAL-TL-83-213Based on 5/8 thick panelsRAL-TL-84-138Based on 5/8 thick panels,6 20 gauge structural studsand 5 THERMAFIBER SAFB64 RAL-TL-87-142Based on 6 20 gauge structuralstuds and 5 THERMAFIBER SAFB65 RAL-TL-84-150Based on 5/8 thick panels,6 20 gauge structural studs,5 THERMAFIBER SAFB, acousticalsealant bead between panelsand studs, dabs 8 o.c. betweenpanel layers on stud side17 USG Acoustical Assemblies

APartitionsSteel FramedNon-loadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Indexwt. 13 • 1/2 SHEETROCK Brand FIRECODE C Core 63 RAL-TL-87-1523 hour UL Des U419 A-17Gypsum Panelsor U455– 3-5/8 20 gauge studs 24 o.c. 65 RAL-TL-87-1437 1 ⁄8"–3 THERMAFIBER SAFB6 20 gauge structural studs,– RC-1 channel or equivalent one side,5 THERMAFIBER SAFBspaced 24 o.c.– face layer joints finishedwt. 17 • 4 layers 1/2 SHEETROCK Brand 62 SA-8301134 hour UL Des U419 SA920 A-18FIRECODE C Core Gypsum Panels,Based on assembly with 1-1/2or U4355 5 ⁄8"each side– 1-5/8 25 gauge steel studs 24 o.c.• optional veneer plastermineral wool batt in cavitywt. 13 • 2 layers 3/4 SHEETROCK Brand ULTRACODE 56 SA-9109074 hour UL Des U419 A-19Core Gypsum Panels, each sideor U4905 1 ⁄2"– 2-1/2 25 gauge steel studs 24 o.c–2 THERMAFIBER SAFB– face layer joints finishedChase Wallswt. 6 • 5/8 SHEETROCK Brand FIRECODE Core 52 RAL-TL-76-1551 hour UL Des U420 SA920 A-2010 3 ⁄4"Gypsum Panels, each side or FIBEROCKBrand Panels– 1-5/8 25 gauge steel studs 24 o.c.in 2 rows– 5/8 gypsum panel gussets or steelrunner braces spanning chase screwattachedto studs• optional veneer plasterBased on 3-1/2 insulation, one sidewt. 17 • 1/2 DUROCK Brand Cement Board and 60 SA-8405151 hour UL Des U404 SA934 A-215 1 ⁄2"1/4 ceramic tile– 1-5/8 20 gauge steel studs 16 o.c.in two rows with horizontal braces– 1-1/2 THERMAFIBER SAFB• alternate design 5/8 SHEETROCK BrandFIRECODE Core Gypsum Panels, one side61Based on 3 THERMAFIBER SAFB andalternate designSA-840524Based on 3 THERMAFIBER SAFBand 3-5/8 studswt. 18 • 1/2 DUROCK Brand Cement Board and 65 SA-8411122 hour UL Des U444 SA934 A-2212"1/4 ceramic tile• base layer 1/2 SHEETROCK BrandFIRECODE C Core Gypsum Panels– 1-5/8 25 gauge steel studs 16 o.c.in two rows with horizontal braces– 1-1/2 THERMAFIBER SAFB• alternate design 2 layers 1/2 SHEETROCKBrand FIRECODE C Core Gypsum Panels,one side62 SA-841102Based on 3 THERMAFIBER SAFBand alternate design18 USG Acoustical Assemblies

Steel FramedLoadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Indexwt. 9 • 1/2 SHEETROCK Brand FIRECODE C Core 49 USG-8110091-1/2 UL Des U425 A-23Gypsum PanelsBased on 2 mineral wool batt hour5 1 ⁄2"– 3-1/2 20 gauge steel structural studs24 o.c.– face layer joints finished49 USG-810940Based on 2 mineral wool batt and 620 ga struc studswt. 11 • 5/8 SHEETROCK Brand FIRECODE Core 48 USG-8110062 hour UL Des U423 A-24Gypsum Panels or FIBEROCK Brand Panels Based on 2 SAFB in cavityor U4256"– 3-1/2 20 gauge steel structural studs24 o.c.– face layer joints finished– loadbearing up to 100% allowable studaxial load when min 2 THERMAFIBERmineral wool batt is used in stud cavities;otherwise load-bearing up to 80%allowable steel axial load(UL Des U423 or U425)– loadbearing up to 100% allowable studaxial load (UL Des U423)• Alternate based on three layers 1/2SHEETROCK Brand FIRECODE C Core GypsumPanels, each side49 USG-810937Based on 2 SAFB and 6 20 gaugestructural studs19 USG Acoustical Assemblies

APartitionsWood FramedLoadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Indexwt. 7 • 5/8 SHEETROCK Brand FIRECODE Core 34 USG-30-FT-G&H1 hour UL Des U305, SA920 A-25Gypsum Panels or FIBEROCK Brand Panels Based on 16 stud spacing andU3144 3 ⁄4"– 2x4 wood stud 16 or 24 o.c.screws 6 o.c.– joints finished• optional veneer plaster37 USG-860807Based on 24 stud spacing46 BBN-700725Based on 24 stud spacingand 3 mineral wool battwt. 7 • 5/8 SHEETROCK Brand FIRECODE C Core 50 BBN-7609031 hour UL Des U327 A-265 1 ⁄4"Gypsum Panels– 2x4 wood stud 16 or 24 o.c.–3 THERMAFIBER SAFB– RC-1 channel or equivalent one side– joints finishedwt. 12 • 5/8 SHEETROCK Brand FIRECODE Core 52 USG-8102182 hour UL Des U301 SA920 A-276"Gypsum Panels or SHEETROCK BrandWater-Resistant FIRECODE Core GypsumPanels or FIBEROCK Brand Panels– 2x4 wood studs 16 o.c.– joints finished• optional veneer plaster58Based on same assembly (non-firerated) with RC-1 channel and withoutmineral wool battUSG-810219Based on same assembly with RC-1channel and 2 mineral wool battChase Walls• 1/2 SHEETROCK Brand FIRECODE C Core 57 RAL-TL-73-2241 hour GA-WP-3810 A-28Gypsum Panels, both outside both walls 3-1/2 glass fiberdouble layer and inside single layer12 1 ⁄4"10 1 ⁄2"• 5/8 SHEETROCK Brand FIRECODE Core 51 RAL-TL-69-2142 hour GA-WP-3820 A-29Gypsum Panels, or FIBEROCK Brand Panels– 2 rows 2x4 wood studs 16 o.c. onseparate plates 1 apart– joints finished56 USG-710120Based on 3-1/2 thick insulationin one cavity58 GA-NGC-30568"• 5/8 SHEETROCK Brand FIRECODE C Core 47 RAL-TL-69-2112 hour GA-WP-3910 A-30Gypsum Panels or FIBEROCK Brand Panels– 2x4 wood studs 16 o.c. on 2x6 common 51 GA-NGC-2377plate– joints finished20 USG Acoustical Assemblies

Wood FramedChase Walls Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Index9"• 1/2 DUROCK Brand Cement Board and 50 SA-8405232 hour WHI-495-0505 SA934 A-311/4 ceramic tile and 0508– 2 rows 2x4 16 o.c. on 2x8 commonplate– 3-1/2 THERMAFIBER SAFB both cavities– joints taped– load-bearing up to 50% allowable designload21 USG Acoustical Assemblies

APartitionsArea Separation Wall SystemsNon-loadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Index11 1 ⁄2"Separation wall (non-loadbearing) 46 RAL-TL-88-3532 hour UL Des U336 SA925 A-32• 1 SHEETROCK Brand Gypsum Liner Panels• 2 USG H-Studs 24 o.c.Protected wall (bearing or non-loadbearing)of wood or steel studs each side min3/4 from liner panels• 1/2 SHEETROCK Brand Gypsum Panels5457RAL-TL-88-348Based on 2 mineral wool batt onone sideRAL-TL-88-351Based on 2x4s and 3 mineralwool batt one side58 RAL-TL-88-347Based on 2x4s and 2 mineralwool batt on both sides60 RAL-TL-88-350Based on 2x4s and 3 mineralwool batt on both sides22 USG Acoustical Assemblies

Shaft Wall SystemsNon-loadbearing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC Test Number Rating Test Number ARL Indexwt. 9 • 1/2 SHEETROCK Brand FIRECODE C Core 38 USG-0409172 hour UL Des U415, SA926 A-33Gypsum Panels, face layer joints finishedSystem B3 1 ⁄2"• 2-1/2 USG C-H Studs 25 gauge 24 o.c. 43 USG-040912or U438• 1 SHEETROCK Brand Gypsum Liner Panels Based on 4 C-H studs 25 gauge48 RAL-OT-04-022Based on 1 sound batts in cavity50 RAL-OT-04-019Based on 4 C-H studs 25 gauge with3 mineral fiber insulationwt. 9 • 1/2 SHEETROCK Brand FIRECODE C Core 44 USG-0409112 hour UL Des U415, SA926 A-34Gypsum PanelsBased on 4 C-H studs 25 gaugeSystem E3 1 ⁄2"• 2-1/2 USG C-H Studs 25 gauge 24 o.c.or U467• 1 SHEETROCK Brand Gypsum Liner Panels– joints finished both sideswt. 10 • 1/2 SHEETROCK Brand FIRECODE C Core 53 USG-0409092 hour UL Des U415, SA926 A-35Gypsum Panels applied vertically,Based on 4 C-H studs 25 gaugeSystem F4"face layer joints finished– RC-1 resilient channel or equivalent24 o.c.• 2-1/2 USG C-H Studs 25 gauge 24 o.c.• 1 SHEETROCK Brand Gypsum Liner Panels58with 3 mineral fiber insulationUSG-040910Based on 4 C-H studs 25 gaugewith additional layer on liner panelside and 3 mineral fiber insulation23 USG Acoustical Assemblies

BFloor/CeilingsSteel FramedSteel C-joist Framing Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC IIC Test Number Rating Test Number ARL Indexclg. wt. 4 • 2 layers 1/2 SHEETROCK Brand 39 USG-7601051 hour UL Des L524 B-19 5 ⁄8"FIRECODE C Core Gypsum Panels–7 18 gauge steel joists 24 o.c.• USG DGL Drywall Suspension System(not shown)43Based on 9-1/2 16 gaugesteel joistsUSG-760310Based on 9-1/2 16 gaugesteel joists and 3 mineral woolbatt56 USG-760106Based on 9-1/2 16 gaugesteel joists and carpet pad60 USG-760405Based on 9-1/2 16 gaugesteel joists and carpet pad with3 mineral wool battclg. wt. 3 • 5/8 SHEETROCK Brand FIRECODE C Core 45 KAL-4435361 hour Estimated fire rating B-2Gypsum PanelsBased on RC-1 channel orbased on witnessed– 7-1/2 18 gauge steel joists 24 o.c. equivalent 24 o.c.laboratory test10 5 ⁄8"– 2-1/2 concrete floor on corrugatedsteel deck70 KAL-443535– joints finishedBased on carpet and padclg. wt. 5 • 2 layers 5/8 SHEETROCK Brand 48 USG-7711011-1/2 UL Des L527 B-3FIRECODE C Core Gypsum Panelshour11 7 ⁄8"– 3/4 T&G plywood floor– 9-3/8 16 gauge steel joists 24 o.c.– RC-1 channel or equivalent– joints finished51 SA-781110Based on carpet and padclg. wt. 5 • 5/8 SHEETROCK Brand FIRECODE C Core 44 KAL-4435332 hour Estimated fire rating B-4Gypsum Panelsbased on witnessed– 7-1/2 18 gauge steel joists 24 o.c. 73 KAL-443680laboratory test11 1 ⁄4"– 2-1/2 concrete floor over corrugatedBased on carpet and padsteel deck– joints finished47 KAL-443534Based on RC-1 resilientchannel or equivalent 24 o.c.24 USG Acoustical Assemblies

Wood FramedDimensional Lumber Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC IIC Test Number Rating Test Number ARL Indexclg. wt. 3 • 5/8 SHEETROCK Brand FIRECODE Core 38 32 CK-6412-71 hour UL Des L501 SA305 B-5Gypsum Panels, ceilingBased on 1-1/4 nominal woodSA920–1 nominal wood sub and finished floor– 2x10 wood joist 16 o.c.– joints finished• optional LEVELROCK Brand FloorUnderlayment• optional SRM-25 or SRB sound mat• optional veneer plaster39 56floorCK-6412-8Based on 1-1/4 nominal woodfloor, 44 oz carpet and 40 ozpad atop flooringclg. wt. 3 • 1/2 or 5/8 SHEETROCK Brand 47 67 CK-6512-71 hour UL Des L514 B-6FIRECODE C Core Gypsum Panels– 1-1/4 nominal wood sub and finishedfloor– 44 oz carpet and 40 oz pad atop floor– 2x10 wood joist 16 o.c.– RC-1 channel or equivalent– joints finished48 66Based on 1/2 SHEETROCKBrand FIRECODE C CoreGypsum PanelsCK-6412-9Based on 5/8 SHEETROCKBrand FIRECODE CoreGypsum Panelsclg. wt. 3 • 5/8 SHEETROCK Brand FIRECODE C Core 59 USG 7407041 hour UL Des L516 SA920 B-7Gypsum Panels– 1-5/8 perlite-sand concreteBased 3 mineral wool batt,3/4 gypsum concrete and 1/212 5 ⁄8"– plywood subfloorSHEETROCK Brand FIRECODE C– 2x10 wood joists 16 o.c.Core Gypsum Panels– RC-1 channel or equivalent– joints finished• optional veneer plaster47 USG 740703Based on 3 mineral woolbat, vinyl tile atop flooringclg. wt. 3 • 5/8 SHEETROCK Brand FIRECODE C Core 59 54 RAL-IN04-006/TL04-033 1 hour SA305 B-8Gypsum Panels– 2x10 wood joist 16 o.c.– RC-1 channel or equivalent 16 o.c.– Insulation held up under subfloor by 58 55Cushioned vinyl floor, SRM-25,1 LEVELROCKRAL-IN04-007/TL04-03411 5 ⁄8"lightning clipsEngineered wood-laminate floor– 19/32 T&G wood subfloorSRM-25, 1 LEVELROCK• 3/4 LEVELROCK Brand Floor Underlayment59 77 RAL-IN04-005/TL04-032Carpet with SRM-25, 1 LEVELROCK25 USG Acoustical Assemblies65 USG 740705Based on 3 mineral woolbatt, 44 oz. carpet and40 oz. pad atop flooring59 52 RAL-IN04-009/TL04-067Ceramic tile with crack-isolationmembrane, SRM-25, 1 LEVELROCK58 50 RAL-IN04-013/TL04-100Cushioned vinyl floor, SRB board58 51 RAL-IN04-012/TL04-099Engineered wood-laminate floor,SRB board58 73 RAL-IN04-010/TL04-097Carpet with SRB board

BFloor/CeilingsWood FramedDimensional Lumber Acoustical Performance Fire Performance ReferenceConstruction Detail Description STC IIC Test Number Rating Test Number ARL Index• 2 layers 5/8 SHEETROCK Brand 52 RAL-IN-89-52 hour UL Des L541 SA934 B-9FIRECODE C Core Gypsum Panels–8 x 8 ceramic tile• 1/2 DUROCK Brand Exterior Cement Board58 RAL-TL-89-145Based on vinyl tile over oriented• 1 SHEETROCK13 1 ⁄4"Brand Gypsum Liner Panelsstrand board in place of ceramic– 1/2 plywoodtile and cement board– 2x10 wood joist 16 o.c.–3 mineral wool batt– RC-1 channel or equivalent51 RAL-IN-89-759 RAL-TL-89-146Based on carpet/pad overoriented strand board in place ofceramic tile and cement board60 RAL-TL-89-14162 RAL-IN-89-813"• 2 layers 5/8 SHEETROCK Brand 59 RAL-TL-90-402 hour UL Des L541 B-10FIRECODE C Core Gypsum Panels– 2x10 wood joists 16 o.c.– 3 mineral wool batt69 RAL-IN-90-5– RC-1 channel or equivalent59 RAL-TL-90-40Based on vinyl tile inplace of carpet/pad37 RAL-IN-90-6Engineered Joistclg. wt. 3 • 5/8 SHEETROCK Brand FIRECODE C Core 47 40 RAL-TL-81-871 hour UL Des L530 SA305 B-11Gypsum Panels, ceilingRAL-IN-81-16based on 9-1/2– 3/4 T&G plywood deep TJI joists12 5 ⁄8"– I-shaped wood joist 24 o.c.– metal furring channel 24 o.c.– 1-1/4 8 pcf THERMAFIBER insulation(UL Des 531)– joints finished• optional 3/4 LEVELROCK Brand FloorUnderlayment• optional SRM-25 or SRB sound mat5443RAL-IN-81-17Based on carpet and padatop flooringRAL-IN-81-19Based on cushioned vinyl atopflooring12 3 ⁄8"12 5 ⁄8"• 2 layers 1/2 SHEETROCK Brand 64 58 RAL-OTO3-05/061 hour UL Des L570 SA305 B-12FIRECODE C Core Gypsum Panels• optional SRM-25 or SRB sound mat– 19/32 wood subfloor– 9-1/2deep “I” shaped wood joist 24 o.c.–14 parallel chord wood truss 32 o.c.– RC-1 or equivalent• 3/4 LEVELROCK Brand Floor Underlayment64 621 LEVELROCK, vinyl, SRM-25,3-1/2 insulationRAL-OTO3-07/081 LEVELROCK, engineeredwood-laminate floor, SRM-25,3-1/2 insulation66 54 RAL-OTO3-09/101 LEVELROCK, ceramic tile,SRM-25, 3-1/2 insulation65 54 RAL-OTO3-01/023/4 LEVELROCK, vinyl, SRB,3-1/2 insulation66 51 RAL-OTO3-03/043/4 LEVELROCK, ceramic tile,SRB, 3-1/2 insulation,crack isolation membrane26 USG Acoustical Assemblies

Design DetailsWood FramedSound isolating partitionSound isolating partition — chase wall5 /8" SHEETROCK Brand FIRECODE core gypsum panels1 /4" SHEETROCKBrand gypsumpanelsound insulation1 /2" SHEETROCK BrandFIRECODE coregypsum panels2 x 4 wood studsSHEETROCK Brandacoustical sealantSHEETROCK Brand acoustical sealantCeiling/floor attachment — SHEETROCK Brand gypsum panelCeiling/floor attachment/SHEETROCK Brand gypsum panel, FIRECODE C Core panelSHEETROCK Brandjoint tapeSHEETROCK Brandacoustical sealantSHEETROCK Brandjoint tapeSHEETROCK Brandacoustical sealantsound insulationRC-1 resilientchannel orequivalentsound insulationRC-1 resilientchannel orequivalentFloor attachment2x4 wood studFloor attachmentSHEETROCK Brandgypsum panel1 /2"5 /8" SHEETROCKBrand gypsumpanels1 /2"RC-1 resilientchannel orequivalent (maybe inverted toease attachmentof base)RC-1 resilientchannel orequivalent (maybe inverted toease attachmentof base)SHEETROCK Brandacoustical sealantSHEETROCK Brandacoustical sealant27 USG Acoustical Assemblies

Design DetailsWood FramedSingle-layer panels with RC-1 ChannelDouble-layer panels with RC-1 ChannelRC-1 resilientchannel or equivalentRC-1 resilientchannel or equivalent2x4 wood studSHEETROCK Brandgypsum panelRC-1 resilientchannel or equivalentSHEETROCKBrandacousticalsealantsoundinsulation2x4 wood studRC-1 resilientchannel or equivalentSHEETROCK Brandgypsum panelsSHEETROCKBrandacousticalsealantsoundinsulation1 /2"Ceiling and floor assemblies1 /2" plywood subfloor3" sound insulation25 /32" oak finish floorrosin paper2 x 10 joist16" o.c.arch wire between joists1 /2" SHEETROCK BrandFIRECODE C core gypsum panelsRC-1 resilient channel orequivalent–screw applied1 /2" SHEETROCK BrandFIRECODE C core gypsum panelsCeramic tileVinyl tile or carpet/padUL Design L5418" x 8" ceramic tile1 /2" DUROCK Brandexterior cement boardDUROCK Brandceramic tile adhesivevinyl tile orcarpet with pad1 1 /2" pumped, self-leveling gypsumcement floor underlayment (type F)SHEETROCK Brandacoustical sealant1" SHEETROCK Brandgypsum liner panel1 /2" plywoodSHEETROCK Brandacoustical sealant1 /2" plywoodinsulation pinnedbetween joists2x10 woodjoists 16" o.c.2x10 woodjoists 16" o.c.1"1"2 layers of 5 /8" SHEETROCKBrand FIRECODE C coregypsum panelsRC-1 resilient channelor equivalent 16" o.c.3" soundattenuationblankets 1" abovebottom of joists2 layers of 5 /8" SHEETROCKBrand FIRECODE C coregypsum panelsRC-1 resilient channelor equivalent 16" o.c.3" sound attenuationblankets 1" abovebottom of joists28 USG Acoustical Assemblies

Steel FramedPartitions2 1 /2"runner1 /2" max. 3 /8"drywallscrewmetal trimrequired forfire ratingSound isolating partition intersectionSHEETROCK Brandjoint reinforcementSHEETROCK Brandgypsum panelsound insulationdrywallscrewSHEETROCK Brandacoustical sealantTwo-hour rated steel stud partitions1 /2" max.1 /2" max.3"soundinsulation3"soundinsulation7 /8"5 /8" SHEETROCK BrandFIRECODE coregypsum panels7 /8"5 /8" SHEETROCK BrandFIRECODE coregypsum panelsOne-hour rated steel stud partitions1 /2" max.control joint(both sides)1 /2" max.5 /8"5 /8" SHEETROCK BrandFIRECODE coregypsum panels1 /2"sound insulationcompressedto fill opening1 7 /8"3 1 /8"7 /8"5 /8" SHEETROCK BrandFIRECODE coregypsum panel29 USG Acoustical Assemblies

Design DetailsSteel FramedTypical cabinet attachmentZ-furring 24" o.c.sound insulationRC-1 resilientchannel or equivalentSHEETROCK Brandacoustical sealantsteel runnersteel studsoffit with RC-1or equivalent highperformanceceiling system24" typ.screw attach to 20 ga.or 25 ga. inset orstructural stud (seefastening methods)screw attach to RC-1or equivalent (seefastening methods)30" typ.30 USG Acoustical Assemblies

Steel FramedCorner wall partitionSHEETROCK Brandcorner reinforcementRC-1 channelsealant1 /2" SHEETROCKBrand FIRECODE C coregypsum panelssound insulation3" sound insulationSHEETROCK Brandjoint reinforcementzinc controljoint no. 093Sound isolating interrupted ceilingsound insulation extended4'-0" min. beyondeach side of partitionmetalfurring clipSHEETROCK Brandacoustical sealantpartition ceiling runnerscrew-attached tofurring channel31 USG Acoustical Assemblies

Flanking Path DetailsTypical Flanking PathsDoorway Placement – AvoidDoorway Placement – BetterHVAC Design – AvoidHVAC Design – AvoidHVACHVAC Design – BetterHVAC Design – Recommended32 USG Acoustical Assemblies

Interrupting Flanking PathsResilient Channel Wall Framing – AvoidResilient Channel Wall Framing – Recommendedstudshort circuitstudcorrectElectrical Boxes – AvoidElectrical Boxes – BetterElectrical Boxes – Recommended24” minimum separationCabinet Cutoutcabinetgypsum panel33 USG Acoustical Assemblies

Flanking Path DetailsInterrupting Flanking Paths–Multifamily ConstructionJoistsAtticSHEETROCK Brandacoustical sealantgypsumpanelSHEETROCKBrandacousticalsealantSHEETROCK Brandacoustical sealantSHEETROCK Brandacoustical sealantAdjacent BathroomsAdjacent Kitchenscaulkingtubextend waterresistant substratebehind tubgypsum boardcontinued toceilingcabinetNoteSee pg. 29 for high-performance partition.34 USG Acoustical Assemblies

Interrupting Flanking Paths–Acoustical CeilingsAcoustical Panel – Exposed GridAcoustical Panel – Concealed Gridhanger wireexposed splineconcealed splinemetal splinecompressible gasketcompressible gasketsheet metal screwAcoustical Tile – Adhesive Attachment1 1 /2î col d rolled channelfurringchannelhollow wallanchoradhesivegypsum panelcompressible gasket35 USG Acoustical Assemblies

Good Design PracticesIn most building design, the No. 1 acoustical goal is to specify wallpartitions, ceiling systems and floor/ceiling assemblies that will minimizetransmission of airborne and impact sound beyond their areas of origin.This performance can be achieved with a combination of materials,assembly designs and construction methods tested for acousticalperformance on a variety of parameters. Here is an overview of designstrategies for key components that can make spaces more pleasant,comfortable and productive.CeilingsAbsorb Sound in Open SpacesSelect high-NRC ceiling panels for open areas to absorb a significant amount of the sound generated within thesespaces. Acoustics are further improved with partitions having high STC values to help block sound and preventtransmission across large spaces.Block Sound in Enclosed SpacesChoose high-CAC ceiling panels for private offices, meeting rooms and other enclosed areas to block sound from travelingup into the plenum and out to adjacent spaces. This approach will reduce distractions for those outside and improvespeech privacy for those within.Cover Sound in All AreasSound masking covers noise that is not absorbed or blocked by introducing uniform, ambient, background sound intothe space. Sound masking produces an electronic sound spectrum similar to that of softly blowing air; it is amplifiedthrough speakers above the suspended ceiling to unobtrusively raise the background sound level. Sound masking makesnoise in open spaces less distracting, increases speech privacy in enclosed spaces and provides greater acousticalbalance throughout.WallsIncrease massAs partition mass increases, sound waves lose more energy passing through the medium, reducing their ability tovibrate air on the other side. Relying on mass alone, however, poses limitations. Doubling the mass of a partition canreduce sound transmission by up to 5 dB. Thus, achieving a 60 dB reduction would require total mass of 320 poundsper square foot, the equivalent of approximately 3 of solid concrete, not a feasible solution for most building designs.Enlarge air spacesIsolating air space within a partition can increase STC performance. But like increasing mass, performance increasesare limited. Doubling partition air space can reduce sound transmission by up to 5 dB, so achieving a 60 dB reductionwould require an isolated air space 4 wide, hardly practical for most applications.36 USG Acoustical Assemblies

Add sound insulationAdding a layer of fibrous sound-absorbing insulation material such as mineral wool into the partition cavity will dissipatesound by creating friction, which transforms a portion of sound wave energy into heat. However, sound attenuationblankets cannot completely counter the conductivity of the wood or steel studs in the framing assembly, which providea path of least resistance for sound energy.Decouple wall panelsAttaching the wall surface diaphragm (e.g. drywall panels) directly to framing members provides an uninterrupted pathfor sound travel. This route can be interrupted by mounting the surface diaphragm to resilient channels attached tothe wall studs and placing sound insulation inside the partition cavity.Seal flanking pathsClosing off gaps or penetrations in the wall assembly is critical to controlling noise. One of the most effective methods isto apply acoustical sealant at the intersection of the gypsum panel, floor system (wood or concrete), and the leg of thesteel runner or wood sole plate; sealant should be applied at this location on both sides of the partition. A properlysealed wall assembly with one 5/8 gypsum panel on each side and a 1-1/2 thick sound attenuation blanket installedin the air cavity achieves an STC of 53. Without acoustical sealant, this assembly would produce an STC of only 29—adramatic 45 percent reduction.Increase isolation with steel studsA single-layer partition with 5/8 gypsum panels and 3-5/8 stud achieves 40 STC with 25-ga. steel and 38 STC with20-ga. steel. STC falls to 35 with a traditional 2 x 4 stud due to the greater stiffness of wood.Floor/Ceiling AssembliesIsolate soundWhether constructed with joists, trusses or concrete slabs, floor systems can develop gaps or cracks, providing a flankingpath for sound to travel between levels of a building. Even properly sealed assemblies can transmit noise from footsteps,falling objects, closing doors and other impacts. These acoustical problems can be significantly reduced with a flooringsystem that includes a layer of sound absorbing material topped with a poured cementitious underlayment. The pouredunderlayment finds and seals cracks and other sound channels, then hardens to form a solid barrier isolated fromthe structure below by the sound mat or board. This system can provide STC ratings as high as 66 and increase IICby as much as 13 points, a significant improvement.37 USG Acoustical Assemblies

STC GuidelinesSTCBuilding Type Room Adjacent Room Minimum d Medium HighRoomResidential, Bedroom Bedroom 45 50 55including motels, hospitals, Living room 50 55 60and dormitories Kitchen 50 55 60Bathroom 50 55 60Corridor 45 50 55Lobby 50 55 60Mech. room 55 60 60+Living Room Living room 40 45 55Kitchen 45 50 60Bathroom 45 50 60Corridor 45 45 55Lobby 50 55 60Mech. room 50 60 60+Kitchen or Bathroom Kitchen 40 45 50Bathroom 40 45 50Corridor 40 40 50Lobby 45 50 60Mech. room 45 55 60+Business Office Office 45 50 55General area 40 45 50Corridor 40 45 50Washroom 45 50 55Kitchen 45 50 55Conference room 45 50 55Conference Room General area 40 45 50Corridor 40 40 45Washroom 40 45 50Kitchen 45 50 55Conference room 40 45 50General Area Corridor 40 40 45Washroom 40 45 50Kitchen 45 50 55School Classroom Classroom 45 50 55Laboratory 45 50 55Corridor 40 40 45Kitchen 50 55 55Shop 55 60 60Recreation area 45 50 55Music room 60 60 60Mech. room 50 55 60Washroom 45 50 55Music Room Laboratory 45 50 55Corridor 45 50 55Shop 50 55 60Recreation area 50 55 60Music room 55 60 60Mech. room 50 55 60Note(d) Current model building codes require a minimum STC (and IIC) separation of dwelling units. The 2003 International Building Code requires a minimum separationof 50 STC and 50 IIC for apartments, condominiums and townhouses. Local jurisdictions using the 2003 International Residential Code may require a minimumseparation of 45 STC for townhouses.38 USG Acoustical Assemblies

About the cover:ProjectWalt Disney Concert HallLos Angeles, CARecipient of the 2003 AIA Honor AwardArchitectsFrank GehrySanta Monica, CAPhotographer©Andy Ryan

Technical Service800 USG.4YOUWeb Sitewww.usg.comSamples/Literature888 874.2450Samples/Literature E-mailsamplit@usg.comSamples/Literature/Fax888 874.2348Customer Service800 950.3839NoteAll products described heremay not be available in allgeographic markets. Consultyour local sales office orrepresentative for information.TrademarksThe following are trademarksof USG Interiors, Inc. or arelated company: CLIMAPLUS,ECLIPSE,FROST,HALCYON,LEVELROCK,MARS,MICORE,SHEETROCK, SRB,SRM-25, USG. LENCORE andSPECTRA are trademarks ofLENCORE Acoustics Corp.NoticeWe shall not be liable forincidental and consequentialdamages, directly or indirectlysustained, nor for any losscaused by application of thesegoods not in accordance withcurrent printed instructions orfor other than the intendeduse. Our liability is expresslylimited to replacement ofdefective goods. Any claimshall be deemed waived unlessmade in writing to us withinthirty (30) days from date itwas or reasonably should havebeen discovered. By thisbrochure, LENCORE Acousticsand USG do not represent orwarrant that installation or useof their products guaranteecompliance with HIPAA orGLBA requirements.Safety First!Follow good safety andindustrial hygiene practicesduring handling and installationof all products and systems.Take necessary precautionsand wear the appropriatepersonal protective equipmentas needed. Read materialsafety data sheets and relatedliterature on products beforespecification and/or installation.Manufactured byUnited States Gypsum Company125 South Franklin StreetChicago, IL 60606SA200/rev. 6-06© 2006, United States Gypsum CompanyPrinted in U.S.A.