Shaft wall installation

For information on Super Stud CT studs, see the resources and details below. A vertical shaft wall system starts at one corner or up against an adjacent column or wall using a vertical segment of tabbed track. At the top and bottom of the wall, either J-runners or tabbed track or J track may be used. This should be a nice, tight fit, and this first piece may be held in place with 2 or 3 optional screws.

This will allow it to be lifted in place over the near leg of the bottom track, and still fit in the wall. See specific Underwriters Laboratories UL design information for how wide the permissible gap can be at the top of the wall, and what type of fire-caulk must be used to fill this gap.

Note that liner panels can have horizontal butt joints; no blocking is required behind these joints in most assemblies if there are no gaps at these joints. After this first liner panel is in place, a CT stud should be installed over the tapered vertical edge of the panel. This system can be used for ratings of up to 4 hours. In the literature piece SA, I see limiting height tables for unlined shafts, as well as regular shafts. What is the difference?

The difference is in one case the load is considered intermittent, or the load is only applied as the elevator moves by. In the other case the load is sustained or constant. This would be the case for air handling systems. The sustained load is far more severe. Depending on the market you are in, the product will be made at one of three manufacturing locations:. In order to achieve span heights greater than the limited spans the system must be tied back to the structure.

The Architect or Engineer of Record determines the details for this attachment. Can you test a wall assembly horizontally to acquire a fire rating for a ceiling? Not in general.

My project design requires that a continuous run of USG Cavity Shaft Wall be installed beyond the limiting height allowance listed in the SA brochure. What can I do to solve the problem? For heights exceeding the limiting height tables found in the System Catalog SA brochure, we recommend installing the 20 gauge x 6" C-H Stud in combination with a standard 4" C-Stud of heavier gauge. The two stud sections should be fastened together back-to-back with fasteners spaced 12" o. The design or project structural engineer must review any design.

The system does not lend itself for tight radii. A 50 radius has been done, but anything less would require the assistance of the USG Architectural Services group.

Please refer to the appropriate fire-resistance design for specific panel selection. Is the Thermafiber insulation necessary? Can I substitute fiberglass insulation? There are designs that require Thermafiber insulation to achieve the fire rating.

In other assemblies, the Thermafiber insulation is used to increase the STC. Fiberglass insulation cannot be substituted for Thermafiber insulation. How is the air pressure load determined? The elevator cab speed and the number of elevators per shaft determine the air pressure load.

Yes, if not enclosed in an elevator shaft you can work off the 5 psf pressure load. The joints do not require tape, however it is necessary to stagger the joints of the liner panels. The Fire Resistance Rating does not require any joint finishing of the horizontal butt joints of the 1" Liner Panels. We do recommend for heights greater than 12 feet the horizontal butt joints be staggered for proper structural integrity of the wall system.

Please refer to System Catalog SA for additional information. In the literature piece SA in the base section detail there is a piece of gypsum board at a 75 minimum angle. What is this for and is it required? When the slab extends over 2" from the interior side of the Shaft Wall that piece is there to offer protection from things falling onto the ledge and to provide safety to ensure nothing can sit or be left there. It is important that the job engineer approve the type, size, and maximum spacing of track fasteners to meet the design load requirements.

Do not install in areas which will be adjacent to occupancies of unusually high moisture conditions. C-T Studs cannot be spliced. They must be installed full length and one piece. J-runners when not attached to the structure shall not be spliced.

Do not attach the J-runners to the C-T Studs unless noted otherwise by the manufacturer's installation procedures. All Shaftwall members shall be simple span members with no intermediate supports. Provide control joints so that maximum length of continuous partition is 30 feet. Wherever possible, the partition control joints should coincide with those in the building structure. Elevator door frames should be supported independently of the shaftwall.

Where penetrations occur in the partitions, additional reinforcement at corners may be necessary to distribute stresses if control joints are not used and if excessive loads need to be supported. To prevent air movement and resulting whistling, the partition perimeters, as well as all penetrations, should be effectively sealed with a non-hardening sealant. Finishing of all joints in face layers should be done within temperature limitations of the specific joint treatment used.

Not recommended for use as an unlined HVAC supply shaft or duct. Hollow cavities must be fire stopped at each floor. All Opening and Penetration covering assemblies must be approved for use per Section Any Opening or Penetration framing detail provided here is not a tested detail, but a generally accepted practice coinciding with approved assemblies in noted a.

The shorter panel should be at least two feet long or of sufficient length to engage two stud tabs on each panel edge. NOTE: In addition, some local codes may also require that these splices be back-blocked with a 12" x 24" piece of gypsum even though the tests were preformed with these joints unblocked. Also, back blocking may be done with the C-T Stud of proper length and placed horizontal.

Please check with your local jurisdiction. The horizontal joints must be offset from any splice joints in the shaftliner panels by at least 12". All edge and end joints should be offset from the base layer by 24".

For the stairwall system, finished both sides, each side must be installed vertically with 1" Type-S Screws spaced 12" o. Offset edges and ends on opposite sides 24" o.

Caulk all perimeter edges and abutments with dissimilar materials, and penetrations in the facing layers with a non-hardening flexible sealant. All joints on face layers are to be taped and finished and fastener heads finished with joint compounds meeting ASTM C standard specification.

Secure J-Tabbed Track as perimeter framing and plumb to ceiling, floor and sides. Attached with suitable fasteners, spaced not more than 24" o. Apply a bead of non-hardening, flexible sealant to the perimeter.

Pre-plan the stud layout 24" o. Allow equal clearance between top and bottom J-Tabbed Track. Progressively install succeeding studs and panels as described above until the wall section is enclosed. The final panel section may be secured with tabs from the J-Tabbed Track at 12" o.

Where wall heights exceed the standard or available length of Shaftliner panels, the panels may be cut and stacked with joints occurring within the top or bottom third points of the wall. Joints of adjacent panels should be alternately staggered to prevent a continuous horizontal joint. Gypsum panels must engage a minimum of 2 tabs.

They must be installed full height, one piece.