USG Cavity Shaft Wall Systems
Twelve Reasons to Choose USG Cavity Shaft Wall
- The basic system is UL classified-UL Designs U408, U438, U459, U467, U469, and U492.
- National Evaluation Report (NER-258) assures acceptance by all three model code bodies-BOCA, ICBO, SBCCI.
- All major elevator door manufacturers have tested their doors at UL in USG Cavity Shaft Wall.
- ASTM El 52 standard test for door frames doesn't allow substitution-the door frame must be installed in the wall in which it was tested.
- Fire-tested penetration details for call boxes and position indicators.
- USG Steel C-H Stud offers continuous edge support of liner panel for airtight, smoke-tight, rattle-free performance.
- USG Steel C-H Stud has no tabs to bend, break, cut installer's hands or delay the job.
- USG Steel C-H Stud blank width is wider and contains 21 % more steel than some competitive tabbed stud blanks, making it stronger
and more resistant to fatigue.
- Most comprehensive limiting height information allows for safer design practices.
- Oscillation tested to one million cycles-proves system longevity.
- Only wall for which a UL smoke and fire damper test is available.
- More than 20 years of proven performance.
Engineered Performance to Meet Design and Fire Protection Requirements
Walls that enclose elevator shafts, stairwells and other vertical shafts are the most important walls in a building from a life-safety standpoint.
Should a fire occur, fire fighters control the use of elevators; the stairwells provide the only means for human egress within the building. Since
these walls contain the life-lines of the building, they must be structurally strong to withstand lateral loads and provide needed fire protection.
USG Cavity Shaft Wall Systems have been designed and tested using accepted engineering practices with deflection criteria of L/120,
U240 and U360 clear partition heights. Additionally, limiting height tables listed herein account for flexural and shear forces. A wide range of
product and installation combinations is available to meet performance requirements: intermittent air pressure loading of 5, 7-1/2, 10, 15 psf;
vertical heights in three stud sizes to accommodate lobbies and mechanical rooms. A 2 hr. fire-resistant rating, a common building code
requirement, is met with USG Cavity Shaft Walls-UL Design No. U438 and U467. A 2 hr. fire-resistant assembly using one layer of
SHEETROCK brand Gypsum Panels, ULTRACODE Core, is available UL Design No. U492. Also, a 2 hr. fire-resistant assembly using
DUROCK Cement Board on the finish side is available-UL Design U459. 3- and 4-hour fire-resistance ratings and excellent sound control
are offered per U408. Surface burning characteristics for 1" SHEETROCK brand Gypsum Liner Panels are flame spread 20, smoke
developed 0.
Faster Completion -- Earlier Occupancy
SG Cavity Shaft Walls erect easily using components and application procedures familiar to mechanics, Cavity Shaft Walls, because they
are erected without adhesives, install faster than other multi-layer gypsum panel systems. All USG Cavity Shaft Wall Systems install from
each floor, leaving shaft free of scaffolding. Elevators go in early-ready to move personnel and materials to floors when they are needed,
Jobs move faster, schedules are more easily met and buildings can be occupied sooner.
Economy
USG Cavity Shaft Walls utilize low-cost materials and a minimum number of components. The assemblies are lightweight -- as low as 9 psf
for 2-hour systems. In high-rise buildings, USG Cavity Shaft Walls offer an opportunity for significant savings in structural framing costs.
Sound Control
The standard Cavity Shaft Wall assembly offers 39 STC rating; 47 STC is achieved by adding 1" THERMAFIBER Sound Attenuation Fire
Blankets (SAFB) within the partition cavity and 51 STC with RC-1 Resilient Channels or equivalent and 1 -1 /2" THERMAFIBER SAFB.
Provide Airtight Seal
With SHEETROCK Acoustical Sealant applied to partition perimeter and penetrations, the assemblies resist air pressure surges up to 15
psf (see details). This minimizes whistling and dirt accumulation due to air movement.
Strong, Rigid Studs
Engineering design has developed the unique C-H Stud, a strong, rigid and highly efficient structural member. The stud flanges provide
friction-fit contact along the entire liner panel length to eliminate rattles. When used with J-Runners and gypsum liner panels, the C-H Stud
produces a stronger, sturdier wall permitting greater limiting heights compared to competitive systems.
Impact- Resistant
USG Cavity Shaft Walls subjected to impact proved to be rugged and durable. Wall was impacted with a 60 lb. sand bag. In the test, three
impacts each were made at 15 ft.-lb., 30 ft.-lb., and each following 15 ft.-lb. interval until failure. At 270 ft.-lb. the test was stopped; while
cracked, the wall was not penetrated, thus showing remarkable toughness.
|
