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   PART 1 - GENERAL

    01 SECTION INCLUDES

    A. Cavity type shaft wall system of metal studs and gypsum board.

    02 REFERENCE STANDARDS

    A. ASTM C36 - Specification for Gypsum Wallboard.

    B. ASTM C442 - Specification for Gypsum Backing Board and Coreboard.

    C. ASTM C475 - Specification for Joint Treatment Materials for Gypsum Wallboard Construction.

    D. ASTM C630 - Specification for Water-Resistant Gypsum Board.

    E. ASTM C840 - Application and Finishing of Gypsum Board.

    F. ASTM C1002 - Steel Drill Screws for Application of Gypsum Board.

    G. ASTM E119 - Fire Tests of Building Construction and Materials.

    1.02 QUALITY ASSURANCE

    A. Vertical Shafts: For the purpose of designating the minimum requirements for vertical shaft enclosures, design and construction requirements are based on recommendations of USG Cavity Shaft Wall Systems "System Folder SA-926", 1988 edition, as rated by U of C 4-2-75 and U of C 6-23-75.

    B. Horizontal Shafts: For the purpose of designating the minimum requirements for horizontal shaftwall assemblies, design and construction requirements are based on recommendations of USG Cavity Shaft Wall Systems "System Folder SA-926", 1988 edition, as rated by CEG-12-10 and 12-16-82.

    C. The work of this section shall be performed in accordance with "marked-up" manufacturer's installation instructions submitted to Architect, except where more stringent requirements are enforced by state or local regulatory agencies.

    1. Maintain a copy at job-site for Architect's review.

    D. Employ only qualified wallboard finishers for the work of this section.

    E. Coordinate the requirements of this section with other trades required to perform work in each type ofshaft enclosure required for this project.

    1. Do not install shaft enclosure framing and wallboards until metal fabrications and hoistway entrance frames are properly installed.

    1.03 SUBMITTALS

    A. Submit the following in accordance with Section 01340.

    B. USG Cavity Shaft Wall Systems "System Folder SA-926", 1988 edition, clearly indicating the following:

    1. All materials and components required for construction and finishing of shaft wall assemblies. Contractor shall "mark-up" data to clearly show the materials and components proposed to meet the requirements of this section.

    2. Installation instructions for the complete construction of shaft walls.

    3. Requirements for construction of vertical shaft hoistway entranceways.

    4. *Requirements for construction of horizontal shaftwall assemblies.*

    1.04 HANDLING AND STORAGE

    A. Products shall be delivered to job-site bearing manufacturer's labels.

    1. Handle material in a way which will prevent damage.

    2. Comply with Section 01610.

    B. Handle material so as to avoid damage.

    C. Store materials inside, under cover, in a dry place.

    1. Stack flat, off of floor, on boards.

    2. Support gypsum boards to prevent sagging.

    3. Store adhesives and joint material in a warm, dry place in accordance with manufacturer's printed instructions.

    4. Overloading floors is prohibited.

    5. Comply with Section 01620.

    1.05 JOB CONDITIONS

    A. Maintain temperature in areas where work is being performed between 55 and 70 degrees F for 24 hours before, during, and after gypsum board and joint treatment.

    B. Provide ventilation during and following application of adhesives and joint treatment.

    C. Protect wet-applied materials from drying too fast.

   PART 2 - PRODUCTS

    03 METAL FRAMING

    A. For 2-Hour Rated Shaft Walls: Comply with requirements of USG Cavity Shaft Wall Systems "System Folder SA-926", 1988 edition.

    B. Studs: USG C-H Studs and E-Studs, hot-dip galvanized steel.

    C. Runners: USG J-Runners, designation in accordance with stud size, hot-dip galvanized steel.

    D. Jamb Struts: USG 20 gauge Steel Jamb Struts with 3 inch leg length for hoistway elevator door framing, hot-dip galvanized.

    E. Stud Sizes: Of lengths to fit required conditions:

    1. For Other Vertical Shaft Enclosures: 2-1/2 inch, 25 gage C-H studs.

    2. For Horizontal Shaftwall Assemblies: 2-1/2 inch, 25_ gage C-H studs.*

    F. Maximum Deflection: L/240, except where more stringent requirements are enforced by state or local regulatory agencies.

    1. L/360 is required to accommodate marble, ceramic tile, plaster and other similar finishes.

    04 WALLBOARD

    A. Coreboard: USG gypsum shaft wall liner panels, 1 inch thick, beveled edges, 24 inches wide, of single lengths to fit required conditions, complete with special moisture-resistant paper face.

    B. Gypsum Wallboard: USG Firecode "C", 5/8" thick, 48" wide.

    1. Use 5/8" instead of 1/2" specified in "System Folder SA-926".

    2. Use water-resistant type gypsum board.

    05 ACCESSORIES

    A. Provide all accessories required to complete the shaft enclosure work in accordance with Contract Documents.

    B. Fasteners:

    1. For Runners: Power-driven type, as recommended by approved shaftwall manufacturer's installation instructions.

    2. Attach studs to runners with USG Type S, Pan-Head screws.

    3. For Wallboard to Studs: USG Type S, Bugle Head, self-drilling, self-tapping screws, of lengths to fit conditions.

    B. Trim:

    1. Where Wallboard Intersects Other Material: USG No. 200-A Metal Trim.

    2. Corner Beads: USG Dur-A-Bead Reinforcement.

    C. Joint Treatment:

    1. Adhesive Joint Treatment: USG Perf-A-Tape.

    2. Joint Compound: USG Ready-Mixed Compound - All Purpose.

    2.02 SUBSTITUTIONS

    A. Other manufacturers are acceptable for evaluation only after compliance with substitution requirements specified in Section 01630.

    1. Shaftwall systems of other manufacturers must be a system consisting of all components from a "single source responsibility" which fully meets the requirements of this section.

   PART 3 - EXECUTION

    06 SHAFT WALL INSTALLATION

    A. General:

    1. Coordinate shaft enclosure work with interior wall framing/Section 09110 and interior gypsum board/Section 09260.

    2. Verify that existing conditions are ready to receive the shaftwall work.

    3. Beginning of shaftwall work means acceptance of existing conditions.

    3.02 WALLBOARD FINISHING

    A. Finish joints in accordance with gypsum board manufacturer's printed instructions submitted and approved for this work.

    B. After finishing is completed and before paint or wall covering is applied, inspect walls and make corrections to provide smooth surfaces, free from defects.

    1. Walls shall be plumb and true.

    2. All corners shall be plumb and square.

    END OF SECTION