USG Cavity Shaft Wall Systems
7 Steel Door Frames
Ordered separately, should be at least 16 ga. steel, shop primed, and have throats accurately formed to overall thickness of the shaft wall
plus 3/32" minimum. They should be anchored at floor with 16 ga. steel plates welded to trim flanges, with provision for two power-driven
anchors or equal per plate. Jamb anchors should be 18 ga. steel welded in jamb and screw-attached to anchors.
All one-piece frames should be spot-grouted after shaft wall liner is installed. Apply SHEETROCK Setting-Type (DURABOND) or
Lightweight Setting-Type (EASY SAND) Joint Compound just before inserting face layer into frame. If necessary, cut out board to provide
relief at jamb anchor. Do not terminate panels against trim return.
8 Height
Where cavity shaft wall height exceeds max, available panel height, liner panel end joints should be positioned within the upper and lower
third-points of wall. Joints may be butted together smoothed or reinforced with horizontal C-H stud or USG H-spline cut to fit between
adjacent vertical studs. Walls over 16' high should have studs screw-attached to runners. Also, joints in adjacent panels should be staggered
top and bottom to prevent continuous horizontal joint.
9 Stud and Runner Selector
Size and gauge should be based on design load, allowable deflection and end reaction/bending stress.
10 Electric Boxes
Cavity shaft walls will accommodate outlet boxes with depths up to the stud width.
11 Standards
The following standards apply: ASTM C-36-Standard Specification for Gypsum Board; ASTM A-446-Standard Specification for Steel Sheet,
Zinc-Coated (Galvanized) by the Hot-Dip Process, Structural (Physical) Quality; ASTM-C-475-Standard Specification for Joint Treatment
Materials for Gypsum Wallboard Construction; ASTM A-525-Standard Specification for General Requirements for Steel Sheet, Zinc-Coated
(Galvanized) by the Hot-Dip Process; ASTM C-645-Standard Specification for Non-Load (Axial) Bearing Steel Studs, Runners (Track), and
Rigid Furring Channels for Screw Application of Gypsum Board; ASTM C-754-Standard Specification for Installation of Steel Framing
Members to Receive Screw-Attached Gypsum Board, Backing Board, or Water-Resistant Backing Board; ASTM C-840-Standard
Specification for Application and Finishing of Gypsum Board; ASTM C-1 002-Standard Specification for Steel Drill Screws for the
Application of Gypsum Board; ASTM C-1 047-Standard Specification for Accessories for Gypsum Wallboard and Gypsum Veneer Base.
12 Additional Information
See WB1 991 USG Cavity Shaft Wall System: The Surest Way to the Top and the following technical folders in this series: SA100
Construction Selector; SA920 Plaster Systems; SA927 Gypsum Panels and Accessories; and SA933 Textures.
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