Life safety assurance for modern building designs. Shaft Wall. Systems

Transcription

1 Life safety assurance for moern builing esigns Shaft Wall Systems

2 Walls that enclose elevator shafts, stairwells an other vertical shafts are the lifeline of a builing. Shoul a fire occur, firefighters control the use of elevators, leaving stairwells as the only means for occupant egress or rescue within the builing. Since these walls are an important part of the builing, they must have the strength to withstan lateral loas an provie neee fire protection. High-Performance Shaft Walls

3 User s Guie This brochure explains: What a shaft wall system comprises The ifferent applications where shaft wall systems can be use How to select an specify the appropriate components of a shaft wall system Pages Unerstan Your System 4 Overview Applications Components Performance Testing Select Your System Performance Selector 14 Limiting Heights Soli Shaft Wall Limiting Spans Design Your System Design Details 23 Goo Design Practices Specify Your System 36 Application Guie Specifications For More Information Technical Service 800 USG.4YOU Websites usg.com usgesignstuio.com 3 USG Shaft Wall Systems

4 Overview USG shaft wall systems are non-loabearing gypsum wall partition assemblies constructe from outsie the shaft at each floor. Shafts are enclose early in construction, an the walls are finishe later, along with interior partitions. Installation is quick an easy, using components an application proceures familiar to rywall contractors. This system installs faster than other multilayer gypsum panel systems because it is installe from one sie, leaving the shaft free of scaffoling. The assemblies are constructe of gypsum liner panels friction-fitte into C-H stus in a progressive manner, with gypsum panels, gypsum fiber panels or cement boar applie to the face. Typical Shaft Wall Assembly Utility chase USG C-H stu 1" Bran Gypsum Liner Panels 1" Bran Mol Tough Liner Panels 1" Bran Glass-Mat Liner Panels USG J-runner Two USG Jamb Struts 1" Bran Gypsum Liner Panels USG C-H stu Bran Gypsum Panels Bran Gypsum Panels Elevator shaft Elevator shaft oor frame Elevator car 4 USG Shaft Wall Systems

5 Applications Use USG shaft wall systems to construct elevator shafts, mechanical shafts, stairwells, air return shafts an horizontal membranes. These shafts are vital for vertical communication, power, water, fresh air, exhaust an a means of egres. Walls Intermittent Air Pressure Loas Elevator shafts Ieal for elevator shafts since the walls can be constructe from one sie, leaving the shaft free of scaffoling. This allows elevator equipment to be installe simultaneously. Stair shafts Accommoates stair shafts by allowing both sies of the wall to be finishe when require. For ae abuse resistance in stairwells, face layer panels can be substitute with Bran Mol Tough AR Firecoe Core, Bran Mol Tough VHI Firecoe Core or USG Fiberock Bran Abuse-Resistant Interior Panels. Intermittent Air Pressure Loas Sustaine Pressure Loas Mechanical shafts Vertical HVAC piping an uctwork can easily be containe within the system, as well as allowing for wall penetrations when require. Air shafts (unline) The system can also be use for vertical air shafts within the builing. Shafts can be unline when specific conitions are met. Unline shaft walls can accommoate sustaine air pressure up to 10 psf. See page 20 for more information. 5 USG Shaft Wall Systems

6 Applications Walls Soli Shafts Horizontal Stu Shafts Soli shafts are normally use to construct mechanical or uct enclosures, or in areas where a small section of shaft wall is neee for a single vertical pipe penetration. See page 21 for more information. For certain applications, equipment limitations sometimes make it ifficult to install shaft liner panels an stus vertically. This is true for walls separating shafts when there is only a structural beam provie for supporting the wall. Ceilings Shaft Wall Ceiling Membrane The 2-hr. horizontal membrane (also use in 2-hr. uct enclosures), an the membranes use as the ceiling of 1- an 2-hr. egress corriors, are shown on page 23. When the span of the 2-hr. horizontal membrane is greater than 5'-4", use UL Design K504, per etails on page USG Shaft Wall Systems

7 Components USG shaft wall systems have been comprehensively teste for fire resistance ratings only when all of the system components are use together. Substitutions of any of the components are not recommene an are not supporte by USG. Refer to the appropriate prouct material safety ata sheet for complete health an safety information. Gypsum Liner Panels Bran Gypsum Liner Panels High-performance panel has a noncombustible core encase in a water-resistant 100% recycle green face an back paper Unerwriters Laboratories (UL)/Unerwriters Laboratories Canaa (ULC) Classifie for fire resistance Panel is 1" thick an 24" wie with bevele eges Refer to prouct submittal sheet WB2278 for more information Bran Mol Tough Gypsum Liner Panels High-performance panel has a noncombustible an moisture- an mol-resistant gypsum core enclose in a moisture- an mol-resistant, 100% recycle blue face an back paper UL/ULC Classifie as to fire resistance Panel is 1" thick an 24" wie with bevele eges Refer to prouct submittal sheet WB2389 for more information Bran Glass-Mat Liner Panels High-performance panel has a noncombustible an moisture- an mol-resistant gypsum core enclose in a moisture- an mol-resistant glass mat on both sies Can be left expose for up to 12 months UL/ULC classifie as to fire resistance Panel is 1" thick an 24" wie with bevele eges Refer to prouct submittal sheet WB2483 for more information Gypsum Panels an Cement Boar Bran Firecoe Core Gypsum Panels All of the avantages of regular panel with aitional resistance to fire Available in 5/8" thickness, 4' with Refer to prouct submittal sheet WB1473 for more information Bran UltraLight Panels Firecoe X Gypsum Panels All of the avantages of Bran Firecoe Core (Type X) Gypsum Panels 15% less weight makes it easier to transport, hanle an install Available in 5/8" thickness, 4' with Refer to prouct submittal sheet WB2598 for more information Bran Firecoe C Core Gypsum Panels Provie improve fire resistance over stanar Firecoe panels because of aitives that enhance integrity of the core uner fire exposure Available in 5/8" an 1/2" thicknesses, 4' with Refer to prouct submittal sheet WB1473 for more information 7 USG Shaft Wall Systems

8 Components Bran Mol Tough Firecoe Core Gypsum Panels Panel has a noncombustible, moisture- an mol-resistant gypsum core encase in a moisture- an mol-resistant, 100% recycle green face an brown back paper Tapere long eges for easy finishing Available in 5/8" thickness, 4' with 5/8" panel is UL Classifie for fire resistance Refer to prouct submittal sheet WB2390 for more information Bran Mol Tough VHI Firecoe Core Gypsum Panels Panel has a noncombustible, moisture- an mol-resistant gypsum core encase in a moisture- an mol-resistant, 100% recycle green face an brown back paper Tapere long eges for easy finishing Available in 5/8" thickness, 4' with 5/8" panel is UL Classifie for fire resistance Core is reinforce with a high-strength mesh for heavy-uty impact-resistance Meet Level 3 performance per ASTM C1629, soft- an har-boy impact resistance Refer to prouct submittal sheet WB2529 for more information Bran Mol Tough AR Firecoe Core Gypsum Panels Panel has a noncombustible, moisture- an mol-resistant gypsum core encase in a moisture- an mol-resistant, 100% recycle green face an brown back paper Tapere long eges for easy finishing Available in 5/8" thickness, 4' with 5/8" panel is UL Classifie for fire resistance Manufacture for greater abuse resistance than stanar 5/8" gypsum panels Meet Level 2 performance per ASTM C1629, soft- an har-boy impact resistance Refer to prouct submittal sheet WB2391 for more information Bran Glass-Mat Panels Mol Tough Firecoe X Panel has a noncombustible, moisture- an mol-resistant gypsum core encase in a moisture- an mol-resistant, fiberglass mat Tapere long eges for easy finishing Available in 5/8" thickness, 4' with 5/8" panel is UL Classifie for fire resistance Suitable for use in pre ry-in (aka pre-rock ) an similar applications of wallboar before the builing envelop is fully enclose Can be expose to weather up to 12 months Refer to prouct submittal sheet WB2560 for more information Bran Glass-Mat Panels Mol Tough AR Panel has a noncombustible, moisture- an mol-resistant gypsum core encase in a moisture- an mol-resistant, fiberglass mat Provie greater abuse resistance compare to stanar rywall Resist surface abrasion, inentation an soft-boy impact Suitable for use in pre ry-in (aka pre-rock ) an similar applications of wallboar before the builing envelope is fully enclose Available in 5/8" thickness, 4' with Can be expose to weather up to 12 months UL Classifie as to fire resistance, surface-burning characteristics an noncombustibility Refer to prouct submittal sheet WB2750 for more information 8 USG Shaft Wall Systems

9 Components Bran Glass-Mat Panels Mol Tough VHI Panel has a noncombustible, moisture- an mol-resistant gypsum core encase in a moisture- an mol-resistant, fiberglass mat Provie superior impact resistance an are an upgrae to abuse-resistant panels Meet ASTM C1629 Level 3 (highest) for har- an soft-boy impact Suitable for use in pre ry-in (aka pre-rock ) an similar applications of wallboar before the builing envelope is fully enclose Available in 5/8" thickness, 4' with Can be expose to weather up to 12 months UL Classifie as to fire resistance, surface-burning characteristics an noncombustibility Refer to prouct submittal sheet WB2749 for more information Bran Ultracoe Core Gypsum Panels 3/4" thick panel can achieve a two-hour fire rating with single-layer construction when use with mineral wool insulation in steel frame walls Available in 4' with Refer to prouct submittal sheet WB2167 for more information Bran Mol Tough Ultracoe Core Gypsum Panels 3/4" thick panel can achieve a two-hour fire rating with single-layer construction when use with mineral wool insulation in steel frame walls Panel has a noncombustible moisture- an mol-resistant gypsum core encase in moisture- an molresistant green face an brown back paper UL Classifie as to fire resistance, surface-burning characteristics an noncombustibility Refer to prouct submittal sheet WB2388 for more information USG Durock Bran Cement Boar Water-urable, mol-resistant substrate for high-moisture areas Refer to prouct submittal sheet CB399 for more information USG Fiberock Bran Abuse-Resistant Interior Panels Resist enting, breaking an puncturing, even in high-traffic areas Excellent fire resistance Mae from 95% recycle materials Refer to prouct submittal sheet F102 for more information USG Fiberock Bran Aqua-Tough Interior Panels Use only for wall esigns Increase resistance to abrasion, inentation an penetration Mae from 95% recycle materials Refer to prouct submittal sheet F134 for more information USG Imperial Bran Firecoe Core an Firecoe C Core Gypsum Base Large size, rigi base for fire-rate gypsum veneer plaster systems Designe for irect or resilient attachment to woo or steel framing Multilayere laminate face paper to control water absorption an resist sag Refer to prouct submittal sheet P790 for more information 9 USG Shaft Wall Systems

10 Components Steel Framing USG Steel J-Runner (JR) USG Steel C-H Stu (CH) 1 1 /2" 2 1 /2", 4", 6" 2" 1" 1 3 /8" 2 1 /2", 4", 6" 7 /32" 1" USG Steel Jamb-Strut (JS) USG Steel E-Stu (ES) 1" 1" 6" 2 1 /2", 4", 6" 3" 3 /8" 1" 3 /4" Thickness Steel Framing a Components Design Thickness b Minimum Thickness Style in. mils in. mils ga. CH, ES JR CH, ES, JR, JS Structural Properties Steel Framing Components Component Prouct Average Weight Area I x c S x Allowance Design an Size Ientification (lb./lin. ft.) (sq. in.) (in. 4 ) (cu. in.) Stress (ksi) 2-1/2" C-H Stu 212CH CH " C-H Stu 400CH CH " C-H Stu 600CH Double 6" E-Stu 600ES ES /2" J-Runner 212JR JR " J-Runner 400JR JR " J-Runner 600JR JR /2" Jamb Strut 212JS " Jamb Strut 400JS " Jamb Strut 600JS Note (a) Stus an runners comply with ASTM C645. (b) Properties of steel framing members have been calculate in conformance with ANSI Specification for the Design of Col-Forme Steel Structural Members, 1996 eition. (c) Full section moulus to be use with corresponing esign stress. 10 USG Shaft Wall Systems

11 Components Interior Finishing Proucts Bran Acoustical Sealant Superior performance as a fire caulk in UL-classifie joint systems Minimizes whistling an irt accumulation ue to air movement when applie to partition perimeter an penetrations Refer to prouct submittal sheet J678 for more information Bran First Coat A flat latex paint formulate to provie a superior first (prime) coat over interior gypsum boar an concrete surfaces Equalizes porosity an surface texture ifferences to provie greater uniformity of finish coat Refer to prouct submittal sheet J1095 for more information Bran All Purpose Joint Compoun Versatile performer: tape, finish, texture, laminate or skim coat Combines single-package, reay-mixe convenience with goo taping an topping performance Refer to prouct submittal sheet J60A for more information Bran Plus 3 Lightweight All Purpose Joint Compoun Weighs up to 30% less than conventional com pouns an sans with the ease of a topping compoun With very low shrinkage, it requires only two coats over metal, such as corner beas an fasteners Refer to prouct submittal sheet J498A for more information Bran Tuff-Hie A high solis, vinyl, acrylic latex-base coating for interior spray application over new rywall Single spray application provies the same results achieve using a typical two-step process of skim coating surfaces with joint compoun followe by a coat of primer Saves time an money Refer to prouct submittal sheet J1691 for more information Bran Paper-Face Metal Bea an Trim Cost-effective, problem-free, beautiful corners Superior solution to ege cracking an chipping Refer to prouct catalog J1424 for more information 11 USG Shaft Wall Systems

12 Performance Testing USG shaft wall systems provie superior safety an performance for an important builing component. Performance Tests USG shaft wall systems result from a program of extensive testing an continuous improvements to help you achieve the superior performance that your project emans. Systems provie up to four-hour fire resistance an soun ratings up to 52 STC, an resist both sustaine an intermittent lateral loas an fatigue uner cyclic lateral loaing. Testing Methos All USG proucts an systems unergo exhaustive testing to ensure that they meet exacting stanars. USG proucts are classifie as to fire resistance an fire-hazar properties. As part of this protocol, Unerwriters Laboratories (UL) perioically auits prouction of these materials to ensure compliance with necessary properties. UL is an inepenent, not-for-profit organization that has teste proucts for public safety for over a century. Proucts are manufacture an teste in accorance with recognize stanars. ASTM International is one of the largest voluntary stanars evelopment organizations in the worl, an is a truste source for technical stanars for materials, proucts, systems an services. These systems have been esigne an teste using accepte engineering practices with eflection limits of L/120, L/240 an L/360. Aitionally, limiting height tables liste herein account for flexural an shear stresses. A wie range of prouct an system combinations is available to meet performance requirements: intermittent an sustaine air pressure loaing of 5, 7-1/2, 10 an 15 psf. Testing Results Fire Protection In the event of a fire, mechanical shafts an stairs are vital channels for communication, power, water, air, exhaust an egress making the shafts the lifelines of the builing. Since it is critically important that these walls protect occupants an necessary services from fire, USG shaft wall systems have been teste for fire enurance. The primary attribute of USG shaft wall systems an its components is fire resistance. Testing supporting this attribute ensures that this critical performance component will not be compromise when properly installe. This fire testing results in the following: UL Classification of all gypsum panel components UL fire-resistance Classifications for one to four hours UL system testing with all major elevator oor manufacturers UL listing for fire amper installation Fire test ata for electrical panels, call-button boxes an other interfaces UL listing of shaft wall hea of wall See the Goo Design Practices section for more information on fire resistance. Soun Control Soun control test ata emonstrate the effectiveness of USG shaft wall systems in attenuating soun. When properly esigne an installe, USG shaft wall systems will increase comfort levels by reucing unwante noise from ajacent spaces. The stanar assembly offers 39 STC rating; 47 STC is achieve by aing 1" soun insulation within the partition cavity, an 52 STC with single-layer 3/4" Ultracoe panels an 3" soun insulation. 12 USG Shaft Wall Systems

13 Performance Testing Testing Results Performance Impact-Resistant for Durability Utilizing abuse-resistant an impact-resistant gypsum panels like Bran Mol Tough AR, USG Sheetrock Bran Mol Tough VHI, USG shaft wall systems meet requirements of IBC Sections an Moisture/Mol The best way to minimize amage from moisture an mol is to minimize or eliminate exposure to water before, uring an after construction. In all cases where moisture intrusion occurs, eliminate all sources of moisture immeiately. Bran Gypsum Liner Panels, Bran Mol Tough Gypsum Liner Panels an USG Sheetrock Bran Glass-Mat Liner Panels have water-resistant facings. In aition, Bran Mol Tough an Bran Glass-Mat Gypsum Liner Panels have moisture- an mol-resistant facings an a waterresistant core. When use in conjunction with goo construction practices, these proucts will minimize, but not eliminate, the risk of moisture an mol amage. For more information on moisture control an mol, see WB2317, Moisture, Mol, an Construction Practices, an SA934, Moisture-Resistant Assemblies. The following Web sites are another resource: New York City Department of Health nyc.gov/html/oh/html/environmental/mol.shtml Search for mol resources. Unite States Environmental Protection Agency epa.gov Search for mol resources. Responsible Solutions to Mol Coalition responsiblemolsolutions.org Search for mol resources. 13 USG Shaft Wall Systems

14 Performance Selector Alternative Materials an Special Requirements The following notes offer alternative methos of construction. 1. Where insulation is shown in assembly rawings, the specific type of prouct is require in the assembly to achieve the state fire-resistance rating. Otherwise, mineral wool or glass fiber insulation may be incorporate into any assembly without compromising the fire-resistant rating. 2. Stu epths are minimum require for fire-resistance rating. 3. Where RC-1 resilient channel is inicate, RC-1 or equivalent may be use. RC-2 is not an equivalent substitution. 4. Use L/360 eflection criteria for limiting height/stu selection an 20 ga. minimum framing when applying USG Durock Bran Cement Boar. Refer to CB399, USG Durock Bran Cement Boar submittal, for more information on application an relate proucts. 5. 5/8" USG Imperial Bran Gypsum Base, 5/8" Bran Mol Tough Firecoe Core Gypsum Panels or 5/8" USG Fiberock Bran Aqua-Tough Interior Panels may be substitute for 5/8" Bran Firecoe Core Gypsum Panels. 6. 1/2" Bran Mol Tough Firecoe C Core or 1/2" USG Imperial Bran Firecoe C Core Gypsum Base may be substitute for 1/2" Bran Firecoe C Core Gypsum Panels. 7. 5/8" Bran Firecoe Core Gypsum Panels, 5/8" USG Imperial Bran Firecoe Core Gypsum Base or 5/8" USG Fiberock Bran panels can be substitute for 1/2" Bran Firecoe C Core Gypsum Panels. 8. Use 20 ga. minimum framing with Bran Mol Tough AR an VHI Firecoe Core, Bran Glass-Mat Panels Mol Tough AR an VHI, or USG Fiberock Bran Panels. 9. 1" Bran Mol Tough Gypsum Liner Panels, or Bran Glass-Mat Gypsum Liner Panels may be substitute for 1" Bran Gypsum Liner Panels in all systems without compromising the fire rating. 10. For more information about performance rate shaft wall systems an for complete list of USG's fire-rate esigns, visit USG Design Stuio at USGDesignStuio.com. 11. For etaile information regaring UL Classifie esigns shown in the Performance Selector, please refer to the UL Fire-Resistance Directory Volume One or visit UL.com. 14 USG Shaft Wall Systems

15 Performance Selector All etails, specifications an ata containe in this literature are intene as a general guie. These proucts must not be use in a esign or construction of any given structure without complete an etaile evaluation by a qualifie structural engineer or architect to verify suitability of a particular prouct for use in the structure. 1-Hour Fire-rate Construction Non-loabearing Acoustical Performance Reference Construction Detail Description Test Number STC Test Number ARL Inex wt. 8 5/8" Bran Firecoe Core Gypsum Panels, joints finishe UL Des U415, System A or 39 USG Base on 4" C-H stus 25 gauge SA " 2-1/2" USG C-H Stus 25 gauge 24" o.c. U469 1" Bran Gypsum Liner Panels 2-Hour Fire-rate Construction wt " 1/2" Bran Firecoe C Core Gypsum Panels, face layer joints finishe 2-1/2" USG C-H Stus 25 gauge 24" o.c. 1" Bran Gypsum Liner Panels UL Des U415, System B or U USG SA USG Base on 4" C-H stus 25 gauge 48 RAL-OT Base on 1" soun batts in cavity 50 RAL-OT Base on 4" C-H stus 25 gauge with 3" mineral fiber insulation wt " 3/4" Bran Ultracoe Core Gypsum Panels, joints finishe 4" USG C-H stus 25 gauge 24" o.c. 3" Thermafiber SAFB 1" Bran Gypsum Liner Panels UL Des U415, System C 51 RAL-OT Base on 4" C-H stus with 3" Thermafiber SAFB insulation SA926 3 wt " 1/2" USG Durock Bran Cement Boar 5/8" Bran Firecoe Core Gypsum Panels 2-1/2" USG C-H stus 20 gauge 24" o.c. 1-1/2" Thermafiber SAFB 1" Bran Gypsum Liner Panels USG Durock Bran Cement Boar, screw attache an laminate to gypsum panel with 4 vertical strip ceramic tile mastic centere between stus UL Des U415, System D SA926 4 wt " 1/2" Bran Firecoe C Core Gypsum Panels 2-1/2" USG C-H Stus 25 gauge 24" o.c. 1" Bran Gypsum Liner Panels Joints finishe both sies UL Des U415, System E or U USG Base on 4" C-H stus 25 gauge SA926 5 wt. 10 4" 1/2" Bran Firecoe C Core Gypsum Panels applie vertically, face layer joints finishe applie vertically, face layer joints finishe RC-1 resilient channel or equivalent 24" o.c. 2-1/2" USG C-H Stus 25 gauge 24" o.c. 1" Bran Gypsum Liner Panels UL Des U415, System F 53 USG Base on 4" C-H stus 25 gauge with 3" mineral fiber insulation 58 USG Base on 4" C-H stus 25 gauge with aitional layer on liner panel sie an 3" mineral fiber insulation SA926 6 wt. 8 2" 2" 1" x 2" perimeter angles 25 gauge 1" Bran Gypsum Liner Panels, fastene to angles 1/2" Bran Firecoe C Core Gypsum Panels 1/2" Bran Firecoe C Core Gypsum Panels, joints finishe UL Des U529 SA USG Shaft Wall Systems

16 Performance Selector 2-Hour Fire-rate Construction Non-loabearing Acoustical Performance Reference Construction Detail Description Test Number STC Test Number ARL Inex 5 1 4" 5/8" Bran Firecoe Core Gypsum Panels, face layer joints finishe 4" USG C-H stus 20 gauge 24" o.c. run horizontally an attache to vertical USG J-runners, 20 gauge 1" Bran Gypsum Liner Panels UL Des U437 USG Base on 4" C-H stus 25 gauge SA Hour Fire-rate Construction wt " 5/8" Bran Firecoe C Core Gypsum Panels, face layer joints finishe 2-1/2" USG C-H stus 25 gauge 24" o.c. 1" Bran Gypsum Liner Panels UL Des U415, System G SA926 9 wt " 5/8" Bran Firecoe C Core Gypsum Panels, face layer joints finishe 2-1/2" USG C-H stus 25 gauge 24" o.c. 1" Bran Gypsum Liner Panels 5/8" Bran Firecoe C Core Gypsum Panels, joints finishe UL Des U415, System H 49 USG Base on 4" C-H Stus SA Hour Fire-rate Construction wt " 3/4" Bran Ultracoe Core Gypsum Panels, on furring channel 24" o.c., over two layers 3/4" Bran Ultracoe Core Gypsum Panels, face layer joints finishe 2-1/2" USG C-H Stus 25 gauge 24" o.c. 1" Bran Gypsum Liner Panels Base layer over furring channel applie vertically UL Des U415, System I SA Note: Stu size an gauge shown are minimums. Possible panels substitutions. Note Stu size an gauge shown are minimums. Possible panel alternatives shown on cross reference of USG Panels an UL Fire Ratings in SA100, Fire-Resistant Assemblies. 16 USG Shaft Wall Systems

17 Performance Selector Wall Systems Limiting Heights USG shaft wall systems are engineere to withstan pressure loas an provie in-service impact resistance to ensure long-term performance an urability. Use this section to etermine the size an gauge of framing for the system you select. You will nee to know elevator pressures an other in-service emans. Structural Performance Limiting Heights Flexing Resistance for In-Service Performance Shaft walls are subjecte to both positive an negative pressures as elevator cabs rise an escen. This piston effect of an elevator in its shaft causes continual flexing of the shaft wall. In tests, USG shaft wall systems were subjecte to over 1 million full oscillation cycles to moel wall performance through the life of the builing. These tests showe that a 25 ga. J-runner is inaequate at the top or bottom of a shaft wall. As the long runner leg is continually flexe from wall eflection, it can rupture an screws can strip out an fracture from the flexing. Oscillation tests showe 24 ga. J-runners minimize these problems an are essential to long-term safety. Maximum partition heights are shown for four ifferent intermittent air pressure loas an three allowable eflections. The applie pressure loa is selecte by the esigner base on elevator cab spee an the number of elevators per shaft. Instea of using only eflection criteria, USG esign ata consier several aitional factors in etermining limiting partition heights. A. Bening stress the unit force exerte that will break or istort the stu. B. En reaction shear etermine by the amount of force applie to the stu, which will ben or shear the J-runner or cripple the stu. C. Deflection the actual eflection uner a loa. Allowable eflection is base on the amount of bening uner loa that a particular wall can experience without exceeing a prescribe ratio relate to partition height. Elevator Shaft Pressures The air pressure loa on shaft walls epens upon the elevator cab spee an the number of elevators per shaft. The following recom men ations are erive from USG tests conucte in three high-rise builings ranging in height from 17 to 100 stories. Recommene Elevator Shaft Pressure Loa Elevator velocity ft./min. One or two elevators per shaft Three or more elevators per shaft 0 to psf 5.0 psf 180 to psf 5.0 psf 700 to 1, psf 7.5 psf 1,600 to 2, psf a 7.5 psf Note (a) Single-cab high-spee elevator shafts may require special esign consierations. 17 USG Shaft Wall Systems

18 Performance Selector Wall Systems Limiting Heights Table Intermittent Air Pressure Loa (win loa) psfa Stu Type an Size 2-1/2" C-H Stus Designation Allowable Deflection 1-Hr. Shaft Wall / Stair Wall (U415 System A) b 2-Hr. Shaftwall (U415 System C) b CH25 L/120 11' 5" 10' 0" 9' 1" 7' 11" L/240 10' 7" 9' 3" 8' 4" 7' 4" L/360 9' 4" 8' 2" 7' 5" 6' 6" 212CH20 L/120 13' 5" 11' 8" 10' 8" 9' 3" L/240 12' 3" 10' 9" 9' 9" 8' 6" L/360 10' 10" 9' 6" 8' 7" 7' 6" 4" C-H Stus 400CH25 L/120 15' 2" 12' 5" 10' 9" 8' 9" 15' 2" 12' 5" 10' 9" 8' 9" L/240 14' 5" 12' 5" 10' 9" L/360 12' 9" 11' 2" 10' 1" 400CH20 L/120 20' 5" 17' 10" 16' 2" 8' 9" 8' 9" 13' 4" L/240 17' 6" 15' 3" 13' 10" 12' 1" L/360 15' 3" 13' 4" 12' 1" 10' 7" 6" C-H Stus 600CH20 L/120 26' 3" 21' 5" L/240 24' 0" 20' 12" 18' 7" 18' 7" L/360 21' 1" 18' 5" 16' 9" Double 6" 600ES20 L/120 28' 0" 28' 0" 28' 0" E-Stus e L/240 28' 0" 24' 9" 22' 6" 15' 2" 15' 2" 14' 8" 20' 0" 20' 0" L/360 25' 3" 21' 9" 19' 6" 17' 3" 14' 5" 12' 5" 10' 9" 12' 9" 11' 2" 10' 1" 20' 5" 17' 10" 16' 2" 8' 9" 8' 9" 13' 4" 17' 6" 15' 3" 13' 10" 12' 1" 15' 3" 13' 4" 12' 1" 10' 7" 26' 3" 21' 5" 24' 0" 20' 12" 18' 7" 18' 7" 21' 1" 18' 5" 16' 9" 28' 0" 28' 0" 28' 0" 28' 0" 24' 9" 22' 6" 15' 2" 15' 2" 14' 8" 20' 0" 20' 0" 25' 3" 21' 9" 19' 6" 17' 3" Stu Type an Size 2-1/2" C-H Stus Designation Allowable Deflection 2-Hr. Shaftwall (U415 System B, D, F) 2-Hr. Stairwall (U415 System E) c CH25 L/120 12' 4" 10' 10" 9' 10" L/240 11' 4" 9' 11" 8' 12" 8' 7" 12' 2" 10' 8" 9' 8" 7' 10" 11' 2" 9' 9" 8' 10" L/360 10' 4" 9' 1" 8' 3" 7' 2" 9' 10" 8' 7" 7' 10" 6' 10" 212CH20 L/120 14' 3" 12' 5" 11' 4" 9' 11" 14' 2" 12' 5" 11' 3" 9' 10" L/240 12' 10" 11' 3" 10' 2" 8' 11" 13' 0" 11' 5" 10' 4" 9' 1" L/360 11' 7" 10' 1" 9' 2" 8' 0" 11' 6" 10' 0" 9' 1" 7' 12" 4" C-H Stus 400CH25 L/120 17' 9" 14' 6" 12' 7" 10' 3" L/240 15' 7" 13' 8" 12' 5" 10' 3" L/360 13' 11" 12' 2" 11' 1" 9' 8" 400CH20 L/120 19' 11" 17' 4" 15' 9" 13' 10" 16' 4" 14' 3" 15' 2" 13' 3" 12' 11" 12' 0" 8' 5" 7' 9" 10' 7" 10' 6" 13' 4" 11' 8" 10' 7" 9' 3" 19' 6" 17' 1" 15' 6" 13' 7" L/240 18' 1" 15' 9" 14' 4" 12' 6" 17' 11" 15' 8" 14' 3" 12' 5" L/360 16' 2" 14' 1" 12' 10" 11' 3" 15' 10" 13' 10" 12' 7" 10' 12" 6" C-H Stus 600CH20 L/120 25' 4" 22' 2" 19' 8" 16' 1" L/240 21' 9" 19' 0" 17' 4" 15' 1" 28' 0" 25' 1" 24' 10" 21' 9" 21' 9" 17' 9" 19' 9" 17' 3" L/360 20' 0" 17' 6" 15' 11" 13' 11" 21' 11" 19' 2" 17' 5" 15' 2" Double 6" 600ES20 L/120 28' 0" 28' 0" E-Stus e L/240 28' 0" 26' 3" 28' 0" 24' 0" L/360 26' 3" 23' 0" 21' 0" 20' 0" 20' 0" 18' 3" 28' 0" 28' 0" 28' 0" 26' 0" 28' 0" 23' 6" 20' 0" 20' 0" 25' 3" 22' 9" 20' 6" 18' 0" 18 USG Shaft Wall Systems

19 Performance Selector Wall Systems Limiting Heights Table Stu Type an Size 2-1/2" C-H Stus Designation Allowable Deflection 3-Hr. Shaftwall (U415 System G) 3-Hr. Stairwall (U415 System H) c CH25 L/120 12' 4" 10' 10" 9' 10" 8' 7" 12' 2" 10' 8" 9' 8" 8' 5" L/240 11' 4" 9' 11" 8' 12" 7' 10" 11' 2" 9' 9" 8' 10" 7' 9" L/360 10' 4" 9' 1" 8' 3" 7' 2" 9' 10" 8' 7" 7' 10" 6' 10" 212CH20 L/120 14' 3" 12' 5" 11' 4" 9' 11" 14' 2" 12' 5" 11' 3" 9' 10" L/240 12' 10" 11' 3" 10' 2" 8' 11" 13' 0" 11' 5" 10' 4" 9' 1" L/360 11' 7" 10' 1" 9' 2" 8' 0" 11' 6" 10' 0" 9' 1" 7' 12" 4" C-H Stus 400CH25 L/120 17' 9" 14' 6" 12' 7" 10' 3" L/240 15' 7" 13' 8" 12' 5" 10' 3" L/360 13' 11" 12' 2" 11' 1" 9' 8" 400CH20 L/120 19' 11" 17' 4" 15' 9" 13' 10" 16' 4" 14' 3" 15' 2" 13' 3" 12' 11" 12' 0" 10' 7" 10' 6" 13' 4" 11' 8" 10' 7" 9' 3" 19' 6" 17' 1" 15' 6" 13' 7" L/240 18' 1" 15' 9" 14' 4" 12' 6" 17' 11" 15' 8" 14' 3" 12' 5" L/360 16' 2" 14' 1" 12' 10" 11' 3" 15' 10" 13' 10" 12' 7" 10' 12" 6" C-H Stus 600CH20 L/120 25' 4" 22' 2" 19' 8" 16' 1" L/240 21' 9" 19' 0" 17' 4" 15' 1" 28' 0" 25' 1" 24' 10" 21' 9" 21' 9" 17' 9" 19' 9" 17' 3" L/360 20' 0" 17' 6" 15' 11" 13' 11" 21' 11" 19' 2" 17' 5" 15' 2" Double 6" 600ES20 L/120 28' 0" 28' 0" E-Stus e L/240 28' 0" 26' 3" 28' 0" 24' 0" L/360 26' 3" 23' 0" 21' 0" 20' 0" 20' 0" 18' 3" 28' 0" 28' 0" 28' 0" 26' 0" 28' 0" 23' 6" 20' 0" 20' 0" 26' 3" 22' 9" 20' 6" 18' 0" Stu Type an Size 2-1/2" C-H Stus Designation Allowable Deflection 4-Hr. Shaftwall (U415 System I) CH25 L/120 12' 4" 10' 10" 9' 10" L/240 11' 4" 9' 11" 8' 12" 8' 7" 7' 10" L/360 10' 4" 9' 1" 8' 3" 7' 2" 212CH20 L/120 14' 3" 12' 5" 11' 4" 9' 11" L/240 12' 10" 11' 3" 10' 2" 8' 11" L/360 11' 7" 10' 1" 9' 2" 8' 0" 4" C-H Stus 400CH25 L/120 17' 9" 14' 6" 12' 7" 10' 3" L/240 15' 7" 13' 8" 12' 5" 10' 3" L/360 13' 11" 12' 2" 11' 1" 9' 8" 400CH20 L/120 19' 11" 17' 4" 15' 9" 13' 10" L/240 18' 1" 15' 9" 14' 4" 12' 6" L/360 16' 2" 14' 1" 12' 10" 11' 3" 6" C-H Stus 600CH20 L/120 25' 4" 22' 2" 19' 8" 16' 1" L/240 21' 9" 19' 0" 17' 4" 15' 1" L/360 20' 0" 17' 6" 15' 11" 13' 11" Double 6" 600ES20 L/120 28' 0" 28' 0" E-Stus e L/240 28' 0" 26' 3" 28' 0" 24' 0" L/360 26' 3" 23' 0" 21' 0" 20' 0" 20' 0" 18' 3" Notes See the Performance Selector for system references an rate assembly etails. Runners fasteners shoul withstan 193 lb. single shear an 200 lb. bearing force; attachment spacing shoul not excee 24". L/180 eflection information available upon request from USG. (a) Stu spacing of 24" o.c. (b) For assembly single-layer boar attache to stus. (c) For assembly with single-layer boar attache to both sies of stus. (e) Attachment of USG steel ouble 6" E-Stu for USG shaft wall systems. The stus are to be attache back-to-back (web-to-web) with pairs of 1/2" long Type S-12 pan hea screws installe in two rows, space as wiely appart as possible. The first an last pairs of fasteners shall start within 6" of each en of the stus. They shall then be space at a maximum of 12" o.c. Limiting Criteria: c - practical limitation - eflection f - bening v - en reaction shear 19 USG Shaft Wall Systems

20 Performance Selector Wall Systems Limiting Heights Unline Shafts Gypsum shaft walls have been use for many years for vent an air shafts. Their fire-resistant features an economical ry construction make them ieal for this use. To function properly, vent an air shaft systems shoul be esigne with the following performance provisions: 1. Gypsum boar surface temperature oes not excee 125 F. 2. Separate approve liners shoul be installe in areas subject to continuous moisture overspray, conensation or air stream temperature over 125 F. 3. Air stream ew point temperatures are maintaine below gypsum boar surface temperature. 4. The assembly is constructe to withstan sustaine esign uniform air pressure loas not exceeing 10 psf. Startup surge loas shoul not be greater than 1-1/2 times the esign static loa. (See table below for limiting heights.) 5. To ensure airtight construction, select appropriate sealants an apply where require. Sustaine Pressure Loa psf 2-Hr. Fire-Rate System 1-Hr. Fire-Rate System Stu Type Designation Stu Allowable an Size Spacing eflection 2-1/2" C-H Stus 212CH-18 24" L/120 10'10" 8'7" 10'0" 7'11" L/240 9'11" 7'10" 9'3" 7'4" L/360 9'1" 7'2" 8'2" 6'6" 212CH-34 24" L/120 12'5" 9'11" 11'8" 9'3" L/240 11'3" 8'11" 10'9" 8'6" L/360 10'1" 8'0" 9'6" 7'6" 4" C-H Stus 400CH-18 24" L/120 14'6" 10'3" 12'5" 8'9" L/240 13'8" 10'3" 12'5" 8'9" L/360 12'2" 9'8" 11'2" 8'9" 400CH-34 24" L/120 17'4" 13'10" 17'10" 13'4" L/240 15'9" 12'6" 15'3" 12'1" L/360 14'1" 11'3" 13'4" 10'7" 6" C-H Stus 600CH-34 24" L/120 22'2" 16'1" 21'5" 15'2" L/240 19'0" 15'1" 20'12" 15'2" L/360 17'6" 13'11" 18'5" 14'8" For more information, consult Progressive Engineering Report AER at p-e-i.com Notes Runner fasteners shoul withstan 193-lb. single shear an 200-lb. bearing force; attachment spacing shoul not excee 24" o.c. (a) Use JR20 runner for this height. 20 USG Shaft Wall Systems