Transcription
-flcouttical PRODUCTSTHE CELOTEX CORPORATIONChiea.ao’ J/ilin.&ii
10-43THE CEIDTEX EORPORATION919NORTH MICHIGAN AVENUE, e Celotex Corporation is theworld's largest manufacturer and distributor of acous-immensepractical field experience in thousands of installations in all types ofbuildings correlated with the activities of an ablematerials.ticalThiskeepsResearch EngineeringAcoustical Service up-to-date and valuableDepartmentILLINOISCelotexto archi-tects.ofimentof decorative effect, weight, texture, light reflec-tion,fire-lawrequirements, maintenanceandotherproblems.SALES ENGINEERING AND APPLICATION SERVICE—In every part of the United States thereisanexclu-sive distributor for Celotex Acoustical Products.These independently owned and operated distribuprovide readily accessible and prompt service toarchitects in the form of acoustical analyses andrecommendations with astorsPRODUCTS— TheCelotex Corporation offers not onebut a choice of several distinct types of acousticalmaterial of widely varying characteristics in morethan 200 individual itemsas to size and finish. ThisGeneral DiscussionsistanceINDEXselectionhas been madeavailable in order to pro-videarchitectswithlatitude in esthetic expres-Acousti-Celotex Cane TileAcousti-Celotex Mineral TileCalicel Productsodsand meth-of application.Absorbexwitheveryrequire-6,7,8tionand estimatesetc., isDETAILSAcousti-CelotexAbsorbexThey include and comply44910Vibraframsion as well as in absorption efficiencies3always availablefrom the Headquarters andField staff of the CelotexAcoustical Department.Competent, dependable information regarding allCelotex Acoustical Products, their proper applicaof cost,promptly supplied.Bythis policy architectsare assured of definite andresponsibilitycontinuingof satisfactory results.
St.Sabina's Catholic Church, Chicago,Illinois,used Calicel on vaultedceiling.Architect:JosephJ.McCarthy, Chicago,111.THE ACOUSTICAL PROBLEMNOISE ABSORPTION—Celotex, more than any othermanufacturer, has taken the mystery out of Acoustics.Acoustical correction is a rational engineering science.Celotex acoustical materials are finished product unitsas they leave the factory and will uniformly provideIn the selection of acoustical material to be used,25 years of experience proves that many other factorsbesides absorption efficiency are worthy of the architect's consideration. These include:—Maintenance and Light Reflection The cost andeffect on absorption of conventional methods forabsorption in accordance with their advertised coeficients.renovating wall and ceiling surfaces.Moisture Resistance The effect on the acousticalmaterial of continual high humidities as in swim-—Noise has been defined as unwanted sound. Forthe elimination of unwanted sound, Celotex AcousticalProducts admirably serve, whether the problem be acathedral, a hospital, a broadcasting studio, an office,oramingrestaurant.two identical auditoria are to be built, one fora Roman Catholic congregation and the other forChristian Scientists, the acoustical recommendationsshould not be the same, because of the difference inple,ifthe nature of the services.—and restaurants where acoustreatment is to be used for sound quieting, thecompetent acoustical engineer will determine at whatpoint the law of diminishing returns makes furtherexpenditure economically unsound.In offices, hospitals,—COMMONUSES The list of places where acousticalused is practically limitless. The followinga partial check list of installations where it is mostmaterialisiscommonlyused:Business OfficesBankstical——Obviously from an acoustical engineering standpoint, there are wide differences between problems inauditoria. The absorption characteristics of the acoustical material, the area to be installed and the locationof the material deserve consideration as well as thespecific use to which the room is to be put. For exam-pools.Conductivity Important where the acoustical material is applied on the underside of a roof deck.Rodent and Vermin Resistance Particularly important in hospitals and restaurant kitchens, etc.Resistance to Impact and Abrasion Important ingymnasia and wherever acoustical material isapplied on traffic-bearing wall areas.ChurchesCourtroomsEducational ransportation TerminalsHotelsDepartment StoresRadio Broadcasting Studios
St1mE—Acousti-Celotexisalight, rigidacous-combining extraordinary sound absorbingefficiency with a durable, smooth finished surface.The face of Acousti-Celotex is perforated to withinVa inch of the back of the tile. These perforationstile(patented) of definite diameter, depth, and spacingact as channels which allow the sound waves readyaccess to the porous interior of the tile where soundabsorption takes place. There are two types ofSeries (Acousti-Celotex Cane Tile)Acousti-CelotexSeries (Acousti-Celotex Mineral Tile), eachandavailable in several thicknesses.—C—M—PAINTABILITY— Theperforations in Acousti-Celotexpermit repeated painting with any kind of paint with-out affecting the sound absorbing efficiency. Paintdoes not seal the openings to the tubular channelsthrough which the sound waves enter the porousblock and are absorbed. This important feature isespecially valuable in installations in offices, hospitals, schools, restaurants, etc., where renewable lightreflection is ofparamount importance.RESISTANCE — IntegrallyMOISTUREduring manufacture, Acousti-Celotexiswaterproofedhighly moisuse in roomsture resistant. It is not recommended forwhere continual excessive humidity exists.RODENT,VERMIN RESISTANCE — Acousti-Celotexcontains no food for rats, micevermin.andother rodents ore1otexCMEFor light reflection qualities of these two basicand variations thereof, see table below.TILE E-SERIESfinishesManufactured from a base of bagasse (the long,of sugar cane), Acousti-Celotex Cane Tilehas a thin face of high density material laminated toa back of highly absorbent fiber structure. It is perforated with 441 holes per square foot. The patentedFerox Process, used on all Celotex Cane Products,tough fibersmakesthe material proof against termitesand dryrot.—Cane Tile comes in standard 6x12, 12x12,and 12x24 inch sizes. Special sizes available atSIZESadditional cost.FINISHES—For specific data see table below.—Acousti-Celotex Cane Tilefinishes RI (Rolled Ivory) andHot Rolled). RI is a smooth,affording good light reflectionpearance.Paintmay beVHRismadeintwo(Varnished andlight-colored surfaceattractive ap-and anapplied over RI withoutVHR, somewhat harder and smoother than RI isa dark brown color and is especially suited as a baseTilehas athermal value of 0.33 B.t.u. per hour, per squareper degree F., per inch thickness.foot,MINERAL TILE M-SERIES—DESCRIPTION Made of mineral aggregate pressedwith a binder to form a rigid incombustible tile,Acousti-Celotex Mineral Tile is perforated with 676holes per square foot. It is universally rated asincombustible.—SIZES Mineral Tile is manufactured in standard6 x 12 and 12 x 12 inch sizes. Special sizes availableat additional cost. For specific data see table i-Celotex Cane(1)—MineralWAreflecting wo standarda smooth,fin-light-paint or enamel.CONDUCTIVITY —Acousti-Celotexhigh quality paint finish.Optional paint finishes over both are available.Mineral Tile has athermal value of 0.35 B.t.u. per hour, per square foot,per degree F., per inch thickness.TYPES OF ACOUSTI-CELOTEXLIGHT REFLECTION FACTORS*Diam.WeightThickness Perforations Per Sq.Ft.(Pounds)(Inches)(Inches)TypeCANE TILEofClC2C3C4C5C6MINERAL TILE 31.50H/41/40.951.375/85/325/321.432.1211/4CANE TILEDiameterFinishNatural, SandedRI (Rolled Ivory)RI plus one coat flat whiteRI plus one coat cream whiteVHR (Varnish Hot Rolled)plus 2 coats whiteVHR plus 2 coats cream whiteVHR plus white enamelVHR plus cream white enamel*By authority of Curtis Lighting, Inc.of 6.74.74.73
CELDTEXINSTALLATION DETAILS S1AChannelscZ4"o.c-0uDetail No.s1PLASTER OR CONCRETE CEILINGOnAcousti-Celotexplaster ceilings Acousti-Celotex is usually cemented (using an approved adhesive) and nailed directly to the plaster. If desired, Acousti-Celotex may beapplied with a heavy bodied adhesive alone to plaster or flat concrete surfaces.Detail No. 5tPLASTER BOARD CEILINGWhereWooda suspended ceiling of lighter and cheaper construction than metallath and plaster is desired. Acousti-Celotex may be directly fastened to gypsumboard held by special suspended plaster board systems. The metal furring shouldnot be spaced greater than 16 inches O. C.Roof Deck, or Ceiling1COne" Acousti-CelotexWOOD DECKDetail No. 2ceilings of wood, as churches or gymnasiums havingis nailed directly to deck.1an exposed wood roofdeck, Acousti-CelotexBeam'ConcreteDetail No. 6or SlabMETAL SUSPENSION— CANETILEit is desired to use the Acousti-Celotex as the suspended ceiling by itself,the Celotex metal suspension system may be used, as shown above. Details ofthis type of construction are available on reguest.WhereI/"‘Built-up Rocj/inqn sulationDtexAcousti-CelotexDetail No. 3On'Acousti-CelotexWOOD FURRINGDetail No. 7concrete surfaces or surfaces where it is desired to fur down. 1 x 3-inchwood furring strips may be attached to the concrete with expansion plugs, andAcousti-Celotex is nailed to the furring strips. Ordinarily, a first course of strips30 inches o.c. is used, to which is nailed a second course 12 inch o.c. to receive12 x 12-inch tiles. A backing of building felt is used directly behind AcoustiCelotex to prevent "breathing" between joints.STEEL DECKAcousti-Celotex Cane Fibre Tile may also be used in combination with steel rootdecks to give a combined acoustical ceiling and steel roof deck having high heatinsulating gualities. The Acousti-Celotex C-Series has the same heat insulatingvalue as an egual thickness of Celotex. The Acousti-Celotex is cut to fit the steeldeck, and fabricated before erection.SOUND ABSORPTION COEFFIEIENTSReprinted by permission from The Official Bulletin of theCoefficientsThicknessMaterial128 2565121024 2048A.M.A., January,NoiseRed.Coef.1937SurfaceACOUSTI-CELOTEX CANE TILEWType Cl*TypeTypeTypeType.24.27.48.57.59.50Painted by mfr. with oil-base paint. Perforated 441 holesper sg. ft. 3/16" diam. 3/8" deep.58.20.59.27.51.52.85.55.60.70.65Same as above.Painted same as above. Perforated same as abovedeep.Same as above.Painted same as above. Perforated same as above 11/16"deep.Painted same as above. Perforated same as above 1-1/16"deep.Unpainted. Perforated 441 holes per sg. ft. V4" diam.5/8" deep.Unpainted. Perforated same as above 1" 62.65.66.60Type C4*114".37.43.98.79.57.70Type C5*13/16".14.35.63.83.90.70Type EX MINERAL TILEType Ml*5/8.17.29.58.82.82.65Type Ml*Type M2*5/8”.14.15.24.34.58.88.93.95.83.77.65.751”* Cemented to Nailedisto 1Unpainted. Perforated 676 holes per sg. ft. 5/32" diam.1/2” deep.Painted with oil-base paint. Perforated same as above.Same as above.plaster board, considered equivalent to cementing to plaster or concrete ceiling.in. wood furring 12 in. o.c. unless otherwise indicated.x2The noise reduction coefficient is the average of the coefficients at freguencies from 256 to 2048 cyclesrecommended for use in comparing materials for noise guieting purposes as in offices, hospitals, banks,For auditorium treatment, attention should be directed to the coefficients at 512 cycles.inclusive, given to the nearestcorridors, etc.5%.This average coefficient5m
CELDTEX10-43CALICEL PHDDUCTSDESCRIPTION — CalicelCalistone,andAcoustical— Calicel,—possess theProductsCalicel Acoustical Castonehave made stone the traditional matemonumental interiors, combining withthese characteristics the softening hush of a cushionsound absorption.Calicel, basically, is a highly expanded stone. A cel-characteristics thatrialfor finishinglular mineral,formedisitat temperatures in excess ofmass being expanded 10 toa hard poroussomewhat comparable in structure to a petrified2,000 degreesthe moltenF.,40 volumes during cooling, resulting instone,sponge. Subsequent refining produces finished Calicel,which serves as an aggregate for all Calicel AcousticalMaterials—CalicelandCalicel Acousticalfor sizeand color, makingand textures inTile, Calistone,Castone.Calicel aggregateisgradedpossible a wide choice of natural colorsthe finished product.In Calicel Tile, the aggregate is thoroughly mixed witha mineral binder, then moulded with hydraulic presses,after which it is kiln cured.Calistoneismadeof selected Calicelaggregates mixedwith certain Portland cements, moulded with hydraulicpresses and cured in kilns under steam pressure. Theresultant stoneand wearinghas the appearance as well as abrasivestrength of natural stone, yet possesses highacoustical value.between Calicel and Calistone, reand wearing strength ofCalistone and its superior moisture-resistant qualities, dueto the Portland cement binder, which make it ideal forIn differentiatingmemberthe superior abrasivesuch conditions as swimming pools.NewYork Central PassengerEntire ceilingandStation, Syracuse, N. Y.frieze of Calicel AcousticalCastoneCalicel Acoustical Castone is made, under arrangements with Celotex, by Jacobson and Company, Inc., NewYork City, nationally known fabricators of cast plaster andinterior stone ornaments, and answers the need for acoustical treatment in buildings and rooms demanding richornamentation.isItideal for the formation of intricate'Wmm 21?-XuMfe. I--V *Standard TypeItalianTypeTapestry Type
CELDTEXCALICEL PRODUCTScoffersTheand elaborateand mouldings.panels,friezes,detail is cast withunusual sharpness.—madeSIZE Calicel Tile arestandard sizes, 6 x 12%and12 x 12in.,— CONTINUEDandthickin.1andin.,x 168inin.Special sizes can also be provided.FINISHES—Calicel Tile—The natural finishThisof fine texture.where higherable,isisalight buff colorandthe standard typeitisavail-with alight reflection is desired,factory-applied lacquer finish.Calicel—ItalianType— Thismadeisof thesameas Standard Type Calicel Tile but containsa sprinkling of dark colored Calicel particles, effectivefine texturefor contrast.CalicelTypeCalicel Ceiling, Netherland Plaza Hotel, Cincinnati,Ohio—Tapestry Type— This resembles the Italiancombination but the surfacein coloriscoarserin texture.Calistone— InCalistonethearelimitationsgreater than that of natural stone—textureandnocolorcan be matched.—APPLICATION Calicel and Calistone may be appliedby cementing with approved acoustical tile ad-eitherhesivesagainstorplastermasonry or may beof a metal suspen-mechanically attached by meanssion system.Wherenatural stone,itCalistonemay beusediserected in thesimulatetosame manneras stone or marble.In certain types of construction ofnature,itisto install structuralCalistone,useda monumentaldesirable in the interests of permanenceinmasonry archdomedorCalicel Castone, Pennsylvania R.R. Station,Newark, N.ceilings.varying thicknesses and sizes, whenrough tile, makesin conjunction with terra cottathe ideal construction.required forThe thicknessof the Calistoneprovide the amount of absorptionproper acoustical correction.can be variedtoSOUND ABSORPTION COEFFICIENTSReprinted by permission from the Official Bulletin of the A.M.A., Jan., 1937CoefficientsMaterialThickness128 256 1512 NoiseRed. Coef.1024 2048UNPAINTED‘Standard,‘Standard, 1"‘Tapestry,‘Tapestry,tCalistone 1”fCalistone 0.65.60.65PAINTED BY MFR., OIL BASE PAINT‘Standard,‘Standard, 1"*Cemented.15.20.22.27.58.76.96.99.76.81.65.70to plaster board, considered equivalent to cementing toor concrete ceiling, t Laid directly on laboratory floor.plaster*The noise reduction coefficient is the average of the coefficients at frequencies from 256 to 2048 cycles inclusive, given to the nearest 5%. This averagecoefficient is recommended for use in comparing materials for noise quietingpurposes as in offices, hospitals, banks, corridors, etc.For auditorium treatment, the coefficients at 512 cycles apply.Rear wall of Court House, Aberdeen, S.showing Calicel Acoustical CastoneD.,J.
ImCELOTEX10-43CALICEL PRODUCTSca11cBIn this wall treatment of a modernized bank inteCalicel Acoustical Products have been used ininteresting fashion to accomplish interior finish, deco-rior,and acousticalthe dado aboveration,In8nate coursesofcorrection.the marble base there are alterCalistone with recessed Calicel, ItalianType, between. Moulded Calicel units form the flutedwhile in the space between the pilasterspilasters,Calicel Tile of the Standard Type have been laid up.Calicel Acoustical Castone adds an interesting ornamental note, the three units in each wall panel beingset in a frieze of moulded Calicel.
adical departurefrom conventional porous acousticalmaterials, Vibrafram depends for itschalk-linedsquares.sound-absorbing qualities on diaphragmatic action of the individualWaterproof adhesive is then applied to all half-inch margins of theunits.1V2Itto 3aistile13 inches square,inches deep,andismadeform plainor ornamented hollow tile shapes,of fireproofed felt, sized toyet softquality.enough to retain a vibratoryThe tile weigh only 3 ouncesper squarefoot.ADVANTAGES— Manyconventionalforthe lower frequencies.characteristic in somesoundsDuetointhisacousticallytreated rooms, there is complaint ofa "dead" condition, while in casesof sound picture theatres the samecharacteristic accounts for a "boom"in the low frequency range, disturbing to a comfortable audition. Be-cause Vibrafram develops its greatest absorption at low frequencies, ithas found wide acceptance in thesound picture theatre field, particularly in Canada where DominionSound Equipments, Ltd., distributorsof Western Electric and RCA SoundSystems have observed its uniqueeffectiveness in scores of theatres.APPLICATION—SurfacestowhichVibrafram are to be applied, suchas concrete, plaster, or wallboard,should be firm, true, and cleaned ofbrafWhenVibrafram is applied tobrick walls, cement, or very roughand cracked plaster surfaces whichprovide an unsatisfactory base foradhesive alone, then the use ofrecommended. Information concerning this method willbe furnished upon request.trellis isDECORATION — Vibraframfur-isnished in three standard tile designs,illustrated on this page. Special individual designs may be had atslightly increased cost.Naturallylight cream in color, Vibrafram maybe stenciled or otherwise decoratedwithout appreciable loss of efficiency.The manufacturer should be consulted regarding paints to be used.A variety of interesting decorativeeffects can be worked out with studyand ingenuity, and in theatre workparticularly the unique acoustical results justify the effort required toemploy Vibrafram harmoniouslyinthe design.NOTE: Vibrafram is not reccommended for application tosurfaces subject to abrasion orbody contact nor should,itbeused in rooms where conditionsof high humidity exist, as inswimmingBelow—EmpireBelowCanada13-inchpressed firmly into position.calcimine, whitewash or loose paint.Surfaces to be treated are scored andTheatre, Quebec,inwhich are then applied andfurringacoustical absorbents adequately absorb high-pitched sounds but provideinadequate absorptiontile,waysbothpools, etc.—CasinoTheatre, Toronto,Canadaram
EELDTEX10-43ABSORBEXAbsorbexisa decorative sound-absorbing materialavailable in conventional sizedItstexture is unique,qualityandsolution forand becausestructural strengthsuspendedDESCRIPTION— Ittileitofor larger units.itsoffersfire-resistinganinterestingceiling construction.form in thickness, containing millions of minute aircells,affording high insulation, great structuralandsuperior acoustical value.——TYPES OF ABSORBEX There are three types ofA, C and F depending on the finenessAbsorbex—of the fibers.All three types are strong, not easilyand verminand inert to temperatures and humidity changes. They can be spraypainted with lead and oil paint without noticeableloss of efficiency. They have high light-reflective qualities and are incombustible.fractured, rodentstallations for various acoustical requirements.natural finishType Ca cement-timber product, madeby shredding timber into long tough fibers and binding them together with an emulsion of high temperature cement. This mass is then formed between rollsand steel belts at about 500 degrees F. into slabs, uniisstrength, fire-resistance,concrete or plaster backing or applied on furring strips.See table and details for absorption coefficients in in-proof,Initsbuff in color.is lightit—Furnished onlyin sheets 20 in. wide by 32,Type C is coarser in texture thanand relatively more porous. May be placed48, or 64 in. long.TypeAin concreteforms without mechanicalbut withties,suitable form supports.Type F—Furnishedor 64 in. long.high insulationeconomical.Recom-efficiency,andvalue, fire-resistance,ismendedfor high-ceilinged structures,siums,armories,chanicalties,such as gymnaItmay beplaced in concrete forms without mebut with suitable form supports.auditoriums,FLAME TEST — StandardDepartmentsthe32, 48,Type Fof the three types,has excellent absorptionsatisfactorilywide byin sheets 20 in.Coarsestdetermining thefireflameBuildings,ofetc.as required bytestsNewYorkCity,forresisting qualities of acousticalmaterials were conductedType A Furnished in tile form, beveled or unbeveled,9x9, 9x18, 18x18, and 18x36 in. One-inch thick-by Columbia Universityon Absorbex. These tests showed that the materialdoes not flame or give off smoke or noxious fumesness only. Larger sizes or factory applied color finishesare optional at additional cost. It may be cemented toits—TypeAAbsorbex—Fullthus rating the materialType C AbsorbexSizeretardantfireandpermittingunlimited use in fireproof construction.—FullType F AbsorbexSize—FullSizeSOUND ABSORPTION COEFFICIENTSReprinted by permission from the Official Bulletin of the A.M.A., January, 1937CoefficientsMaterialThickness128256512 1024 2048NoiseRed.Coef.MountingABSORBEX PAINTED BY MFR., OIL BASE PAINTType AType AType Aand FType A"1"1"2"1"Type A1Type .70.80Cementedcementingto plaster board. Consideredto plaster or concrete ceiling.Nailed tox 21in.1TypeAin.woodfurring 18 in. o.c.spot cemented to1in.Type F cementedplaster board. Considered equivalent toter or concrete ceiling.58.77.98.92.79cementing.85Tile nailed tobetween furring with 1 in. mineral wool.Tile nailed to 2 x 4 in. studs 18 in. o.c. and.91.99.87.84.88.90.15.23.40.66.62.501x 3in.equivalent towoodfurring 18in. o.c.andfilledtoto plas-filled inbetweenstuds with 31/2 in. thick mineral wool.is”CementedcementingType CType FType F"1"1"Type 70.54.63.64.72.50.50.70Nailed to1Nailed to1.70CementedTile nailedto plaster board. Consideredto plaster or concrete ceiling.in.between furring withcementing1in.filled inmineral wool.to plaster board. Consideredto plaster or concrete ceiling.The noise reduction coefficient is the average of the coefficients at frequencies from 256 to 2048 cycles inclusive, givenrecommended for use in comparing materials for noise quieting purposes as in offices, hospitals, banks, corridors, etc.For auditorium treatment, attention should be directed to the coefficients at 512 cycles.equivalent towood furring 16 in. o.c.x 2 in. wood furring 16 in. o.c.to 1 x 3 in. wood furring 18 in. o.c. andx 2to the nearest5%.equivalenttoThis average coefficient
CELDTEXsilAbsorfaexABSORBEX—Type ACalhoun College, Yale University John Russell Pope, Archt.Application on ceiling between beamsABSORBEX—Type A—Bowling Alleys, East Liberty Presbyterian Church, Pittsburgh, Pa.Cram and Ferguson,Archt.ABSORBEX INSTALLATION BETAILS.,,——A'A0' o.o. 5.I .O*. ' . .-Ad.0A — 1-in.to . . **. TypeCement-Beveledspot cementedTile,the plaster or concrete ceiling.ings Absorbexo. : 1 ' * '« :' 3ABSORBEX Type A— Absorbex Typer-r 'v; ?Onplaster ceil-usually cemented (using an ap-isproved adhseive) and nailed directly to plaster.If desired, Absorbex may be applied with a heavybodied adhesive alone to a surface such as concrete.TT --—, :«;ov:V: o;'.::v*.-'so.v.x 3 Strips-Absorbex TypeA — 1-in. Beveled Tile nailed to 1-in. x3-in furring strips togglesuspendedthemetal members fastenedring.Cement—.Type C or F - A*:-.-:.:* 3*.;-:Rock 'WoolAbsorbex TypenailedV.o*CorF;—-.*ABSORBEXType F .IAbsorbex Type A 1-in. Beveled Tile, spot cemented to Absorbex Type F (l-in.x20-in.x64-in.).type F material may be laid inthe forms at the time the concrete is pouredor attached afterwards to the concrete slabwith expansion bolts or dryvinsNOTE: ed.:is.wSuspended Ceiling Construction Absorbex Type A1-in. Beveled Tile when applied to Absorbex TypeF (l-in.x20-in.x64-in.) is usually cemented andA:.toit- vABSORBEX Type A-7 ABSORBEX TypeT. : a- .’U-;used assupported bysuspended metal fur-itself,Details of this construction on request.Type.byceilingABSORBEX-Vbbolted to ceiling.METAL SUSPENSION — Where Absorbex is1x3 Furring Strips-1(20-in.x64-in.)to l-in.x3-in. furring strips,unbeveled,bolted to ceiling.ABSORBEX Type CorFAbsorbex TypeCorF—(20-in.x64-in.)unbeveled,laid in concrete forms.IIu
-Acoustical Materialftot/?eM A/oiteand Setter -/-/ea'cinGCelotexACOUSTICALPRODUCTSAcOUSTI -r ELOTEXr. ALICELTHE CELOTEX CORPORATIONOhicaCfO- J7lUnorc6Digitized byASSOCIATION FOR PRESERVATION TECHNOLOGY, www.apti.orgBUILDING TECHNOLOGY HERITAGE LIBRARYhtt ps:// archi ve.org / d e tail s/b uildinq technoloqyheritagelibraryfor the
10-43 THECEIDTEXEORPORATION 919NORTHMICHIGANAVENUE,CHICAGO,ILLINOIS ACOUSTICAL DEPARTMENT Memlretofi BACKGROUND—TheCelotexCorporationisthe world .
