Copyright 1999, The American Institute of Architects (AIA)

This PRODUCT MASTERSPEC section is licensed by ARCOM (February, 2001) for distribution by National Gypsum Company. Changes made to MASTERSPEC by National Gypsum Company are indicated using underline/strikeout text. Review and accept changes according to project requirements and specifier's practice. The underline and strikeout portions of the text in this Section are not provided by, endorsed by, or representative of the opinions of ARCOM or The American Institute of Architects. For more information contact National Gypsum Company, 2001 Rexford Road, Charlotte, NC 28211. Phone 1-800-NATIONAL. Fax 704-365-7276.

SECTION 09265 - GYPSUM BOARD SHAFT-WALL ASSEMBLIES

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1.1	RELATED DOCUMENTS

A.	Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

1.2	SUMMARY

A.	This Section includes the following:

Adjust list below to suit Project.

1.	Shaft enclosures.

2.	Chase enclosures.

3.	Stair enclosures.

4.	Horizontal enclosures.

B.	Related Sections include the following:

List below only products and construction that the reader might expect to find in this Section but are specified elsewhere.

1.	Division 9 "[Gypsum Veneer Plaster] [Gypsum Board Assemblies] <Insert Section title>" for applying and finishing panels in gypsum board shaft-wall assemblies.

1.3	DEFINITIONS

A.	Gypsum Board Construction Terminology: Refer to ASTM C 11 for definitions of terms for gypsum board construction not defined in this Section or in other referenced standards.

1.4	PERFORMANCE REQUIREMENTS

Delete this Article if thicknesses of framing members are shown on Drawings or are specified. If using performance requirements to establish thicknesses of framing members, verify that shaft-wall assemblies selected are capable of complying.

A.	Structural Performance:

1.	Provide gypsum board shaft-wall assemblies capable of withstanding [the full] [two-thirds of the] air-pressure loads indicated for maximum heights of partitions without failing and while maintaining an airtight and smoke-tight seal. Evidence of failure includes deflections exceeding limits indicated, bending stresses causing studs to break or to distort, and end-reaction shear causing track (runners) to bend or to shear and studs to become crippled.

Retain subparagraph below for horizontal enclosures.

2.	Provide gypsum board shaft-wall assemblies for horizontal duct enclosures capable of spanning distances indicated within deflection limits indicated.

Retain second option below if more than one type of assembly is required.

3.	Air-pressure loads and deflection limits are specified in "Gypsum Board Shaft Wall" [Article] [articles] in Part 2.

1.5	SUBMITTALS

A.	Product Data: For each gypsum board shaft-wall assembly indicated.

B.	Fire-Test-Response Reports: From a qualified independent testing and inspecting agency substantiating each gypsum board shaft-wall assembly's required fire-resistance rating.

Retain subparagraph below if applicable. Revise to describe specific penetrations to suit Project. See "Assembly Characteristics" Article in the Evaluations.

1.	Include data substantiating that elevator entrances and other items that penetrate each gypsum board shaft-wall assembly do not negate fire-resistance rating.

Revise paragraph below to indicate specific model code organization or if report must be from another source.

C.	Research/Evaluation Reports: Evidence of compliance with building code in effect for Project, from a model code organization acceptable to authorities having jurisdiction that substantiate required fire-resistance rating for each gypsum board shaft-wall assembly.

Retain below for STC-rated assemblies.

D.	Acoustical-Test-Response Reports: From a qualified independent testing agency substantiating required STC rating for each gypsum board shaft-wall assembly.

1.6	QUALITY ASSURANCE

A.	Fire-Resistance-Rated Assemblies: Provide materials and construction identical to those tested in assembly indicated according to ASTM E 119 by an independent testing and inspecting agency acceptable to authorities having jurisdiction.

Indicate design designations of specific assemblies on Drawings.

Verify that items penetrating shaft-wall assemblies specified in other Sections may be built into shaft-wall assemblies without negating fire-resistance ratings of design designations.

1.	Fire-Resistance-Rated Assemblies: Indicated by design designations from [FM's "Approval Guide, Building Products."] [UL's "Fire Resistance Directory."] [GA-600, "Fire Resistance Design Manual."] [ITS's "Directory of Listed Products."] <Insert listing organization and publication.>

B.	STC-Rated Assemblies: For gypsum board shaft-wall assemblies indicated to have STC ratings, provide assembly materials and construction complying with requirements of assemblies whose STC ratings were determined according to ASTM E 90 and classified according to ASTM E 413 by a qualified independent testing agency.

Delete paragraph and subparagraphs below if work of this Section is not extensive or complex enough to justify a preinstallation conference. If retaining, coordinate with Division 1.

C.	Preinstallation Conference: Conduct conference at Project site to comply with requirements of Division 1 Section "Project Management and Coordination." Review methods and procedures for installing work related to gypsum board shaft-wall assemblies including, but not limited to, the following:

Delete subparagraphs below if not required. If retaining, revise to include Project-specific requirements. Insert additional requirements to suit Project.

1.	Fasteners proposed for anchoring steel framing to building structure.

2.	Sprayed fire-resistive materials applied to structural framing.

3.	Elevator equipment, including hoistway doors, elevator call buttons, and elevator floor indicators.

4.	Wiring devices in shaft-wall assemblies.

5.	Doors and other items penetrating shaft-wall assemblies.

6.	Items supported by shaft-wall-assembly framing.

7.	Mechanical work enclosed within shaft-wall assemblies.

1.7	DELIVERY, STORAGE, AND HANDLING

A.	Deliver materials in original packages, containers, and bundles bearing brand name and identification of manufacturer or supplier.

B.	Store materials inside under cover and keep them dry and protected against damage from weather, direct sunlight, surface contamination, corrosion, construction traffic, and other causes. Stack gypsum panels flat on leveled supports off the ground to prevent sagging.

1.8	PROJECT CONDITIONS

A.	Comply with requirements for environmental conditions, room temperatures, and ventilation specified in Division 9 Section "[Gypsum Veneer Plaster] [Gypsum Board Assemblies] <Insert Section title>."

PART 2 - PRODUCTS

2.1	MANUFACTURERS

A.	Basis-of-Design Product: The design for gypsum board shaft-wall assemblies is based on National Gypsum Company products named in Part 2 articles. Subject to compliance with requirements, provide the named product or a comparable product by one of the following:

See Editing Instruction No. 1 in the Evaluations for cautions about naming products and manufacturers.

1.	American Gypsum Co.

2.	G-P Gypsum Corp.

3.

4.	United States Gypsum Co.

5.	<Insert manufacturer.>

2.2	ASSEMBLY MATERIALS

A.	General: Provide materials and components complying with requirements of fire-resistance-rated assemblies indicated.

1.	Provide panels in maximum lengths available to eliminate or minimize end-to-end butt joints.

2.	Provide auxiliary materials complying with gypsum board shaft-wall assembly manufacturer's written recommendations.

B.	Steel Framing: ASTM C 645.

1.	Protective Coating: [ASTM A 653/A 653M, G40 (Z120), hot-dip galvanized] [Manufacturer's standard corrosion-resistant zinc] coating.

C.	Gypsum Liner Panels: Manufacturer's proprietary liner panels in 1-inch (25.4-mm) thickness and with moisture-resistant paper faces.

1.	Basis-of-Design Product: National Gypsum Company; Gold Bond Brand 1 inch Fire-Shield Shaftliner.

Retain paragraph below where exposed surfaces of shaft walls or base layers of multilayer applications are gypsum wallboard.

D.	Gypsum Wallboard: ASTM C 36, core type as required by fire-resistance-rated assembly indicated.

1.	Edges: [Tapered] [Tapered and featured (rounded or beveled) for prefilling].

2.	Basis-of-Design Product: National Gypsum Company; [Gold Bond Brand Fire-Shield Wallboard] [Gold Bond Brand Fire-Shield C Wallboard].

Retain paragraph below if exposed surfaces of shaft walls receive gypsum veneer plaster finishes.

E.	Gypsum Base for Gypsum Veneer Plaster: ASTM C 588, core type as required by fire-resistance-rated assembly indicated, with edges as standard with manufacturer.

1.	Basis-of-Design Product: National Gypsum Company; [Gold Bond Brand Kal-Kore Wallboard] [Gold Bond Brand Kal-Kore Fire-Shield Wallboard] [Gold Bond Brand Kal-Kore Fire-Shield C Wallboard] [Hi-Abuse Brand Kal-Kore Plaster Base] [Fire-
Shield Hi-Abuse Kal-Kore Plaster Base] [Hi-Impact Brand Kal-Kore Fire-Shield Gypsum Wallboard].

Consider using water-resistant backing board if finish panels may be installed before building is fully enclosed.

F.	Water-Resistant, Gypsum Backing Board: ASTM C 630/C 630M, core type as required by fire-resistance-rated assembly indicated.

1.	Basis-of-Design Product: National Gypsum Company; [Gold Bond Brand MR Wallboard] [Gold Bond Brand Fire-Shield MR Wallboard].

G.	Cementitious Backer Units: ANSI A118.9, in manufacturer's standard thickness, but at least [1/2 inch (12.7 mm)] <Insert thickness> thick.

1.	Basis-of-Design Product: National Gypsum Company; [PermaBase Brand Cement Board] [PermaBase Flex Brand Cement Board].

H.	Accessories: Cornerbead, edge trim, and control joints of material and shapes specified in Division 9 Section "[Gypsum Veneer Plaster] [Gypsum Board Assemblies] <Insert Section title>" that comply with gypsum board shaft-wall assembly manufacturer's written recommendations for application indicated.

I.	Gypsum Wallboard Joint-Treatment Materials: ASTM C 475 and as specified in Division 9 Section "[Gypsum Board Assemblies] <Insert Section title>."

J.	Gypsum Veneer Plaster Joint-Reinforcing Materials: ASTM C 587 and as specified in Division 9 Section "[Gypsum Veneer Plaster] <Insert Section title>."

K.	Gypsum Veneer Plaster: As specified in Division 9 Section "[Gypsum Veneer Plaster] <Insert Section title>."

L.	Steel Drill Screws: ASTM C 1002, unless otherwise indicated.

Delete subparagraph below if not applicable.

1.	Use screws complying with ASTM C 954 for fastening panels to steel members from 0.033 to 0.112 inch (0.84 to 2.84 mm) thick.

Delete subparagraph below if no cementitious backer units.

2.	For fastening cementitious backer units, use screws of type and size recommended by panel manufacturer.

M.	Track (Runner) Fasteners: Power-driven fasteners of size and material required to withstand loading conditions imposed on shaft-wall assemblies without exceeding allowable design stress of track, fasteners, or structural substrates in which anchors are embedded.

1.	Powder-Actuated Fasteners: Provide powder-actuated fasteners with capability to sustain, without failure, a load equal to [10] <Insert safety factor> times that imposed by shaft-wall assemblies, as determined by testing conducted by a qualified independent testing agency according to ASTM E 1190.

Retain subparagraph above and delete subparagraph below if structural slab conditions allow use of powder-actuated fasteners. If retaining both, show locations of each on Drawings or by inserts. Verify safety factor with structural engineer.

2.	Postinstalled Expansion Anchors: Where indicated, provide expansion anchors with capability to sustain, without failure, a load equal to [5] <Insert safety factor> times that imposed by shaft-wall assemblies, as determined by testing conducted by a qualified independent testing agency according to ASTM E 488.

N.	Acoustical Sealant: [As recommended by gypsum board shaft-wall assembly manufacturer for application indicated.] [As specified in Division 7 Section "Joint Sealants."] [As specified in Division 9 Section "Gypsum Veneer Plaster."] [As specified in Division 9 Section "Gypsum Board Assemblies."] <Insert requirements.>

O.	Sound Attenuation Blankets: ASTM C 665 for Type I, unfaced mineral-fiber-blanket insulation produced by combining thermosetting resins with mineral fibers manufactured from slag or rock wool.

Copy and re-edit Article below for each shaft-wall assembly required, and indicate locations of each on Drawings. Delete requirements shown on Drawings.

2.3	GYPSUM BOARD SHAFT WALL <Insert drawing designation, e.g., SW-1.>

Retain paragraph below, along with paragraph of same title in Part 2 "Manufacturers" Article for basis-of-design specification. Verify that design designations are indicated on Drawings.

A.	Basis-of-Design Product: National Gypsum Company assembly indicated on Drawings by design designation of a qualified testing and inspecting agency.

B.	[Intermittent] [Sustained] Air-Pressure Loads: [5 lbf/sq. ft. (0.24 kPa)] [7.5 lbf/sq. ft. (0.36 kPa)] [10 lbf/sq. ft. (0.48 kPa)] [15 lbf/sq. ft. (0.72 kPa)].

If retaining Part 1 "Performance Requirements" Article, retain applicable air-pressure load above and deflection limit below for shafts and deflection limit below for horizontal enclosures. If air-pressure loads and deflection limits are not retained, delete "Performance Requirements" Article. Verify that assemblies specified above comply with performance requirements retained.

C.	Deflection Limit: [L/240] [L/360] <Insert value>.

D.	Studs: Manufacturer's standard profile for repetitive members and corner and end members and for fire-resistance-rated assembly indicated.

1.	Depth: [As indicated] [2-1/2 inches (63.5 mm)] [4 inches (101.6 mm)] [6 inches (152.4 mm)].

If performance requirements option is selected in subparagraph below as method for determining thickness of members, retain applicable air-pressure load and deflection limit above, and retain Part 1 "Performance Requirements" Article.

2.	Minimum Base Metal Thickness: <Insert thickness based on structural capabilities tabulated in manufacturer's literature and on Project conditions> [As indicated] [Manufacturer's standard thicknesses that comply with structural performance requirements for stud depth indicated].

E.	Track (Runner): Manufacturer's standard J-profile track with long-leg length as standard with manufacturer, but at least [2 inches (51 mm)] <Insert length>, in depth matching studs.

If performance requirements option is selected in subparagraph below as method for determining thickness of members, retain applicable air-pressure load and deflection limit above, and retain Part 1 "Performance Requirements" Article.

1.	Minimum Base Metal Thickness: <Insert thickness based on structural capabilities tabulated in manufacturer's literature and on Project conditions> [As indicated] [Manufacturer's standard thicknesses that comply with structural performance requirements for stud depth indicated].

Retain first paragraph below for framing elevator hoistway entrances. .

F.	Jamb Struts: Manufacturer's standard J-profile strut with long-leg length of 3 inches (76.2 mm), in depth matching studs, and not less than 0.0329 inch (0.84 mm) thick.

G.	Room-Side Finish: [As indicated] [Gypsum board] [Gypsum veneer plaster] [Cementitious backer units].

Generally, delete paragraph above and below and show room- and shaft-side finishes on Drawings.

H.	Shaft-Side Finish: [As indicated] [As indicated by fire-resistance-rated assembly design designation].

I.	STC Rating: [As indicated] <Insert rating>.

Delete below if not applicable.

J.	Cavity Insulation: Sound attenuation blankets.

PART 3 - EXECUTION

3.1	EXAMINATION

A.	Examine substrates to which gypsum board shaft-wall assemblies attach or abut, with Installer present, including hollow-metal frames, elevator hoistway door frames, cast-in anchors, and structural framing. Examine for compliance with requirements for installation tolerances and other conditions affecting performance. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2	PREPARATION

Delete this Article if no sprayed fire-resistive materials.

A.	Sprayed Fire-Resistive Materials: Coordinate with gypsum shaft-wall assemblies so both elements of Work remain complete and undamaged. Patch or replace sprayed fire-resistive materials removed or damaged during installation of shaft-wall assemblies to comply with requirements specified in Division 7 Section "Sprayed Fire-Resistive Materials."

Detail requirements for attaching gypsum board assemblies to construction protected by sprayed fire-resistive materials on Drawings. Show locations of offset anchor plates (usually specified in Division 5) on Drawings.

1.	Before sprayed fire-resistive materials are applied, attach offset anchor plates or ceiling runners (tracks) to surfaces indicated to receive sprayed fire-resistive materials. Where offset anchor plates are required, provide continuous plates fastened to building structure not more than 24 inches (600 mm) o.c.

2.	After sprayed fire-resistive materials are applied, remove them only to extent necessary for installation of gypsum board assemblies and without reducing the fire-resistive material thickness below that which is required to obtain fire-resistance rating indicated. Protect remaining fire-resistive materials from damage.

3.3	INSTALLATION

A.	General: Install gypsum board shaft-wall assemblies to comply with requirements of fire-resistance-rated assemblies indicated, manufacturer's written installation instructions, and the following:

1.	ASTM C 754 for installing steel framing.

2.	Division 9 Section "[Gypsum Veneer Plaster] [Gypsum Board Assemblies] <Insert Section title>" for applying and finishing panels.

Include details on Drawings showing expansion-joint construction and locations.

B.	Do not bridge building expansion joints with shaft-wall assemblies; frame both sides of joints with furring and other support.

C.	Install supplementary framing in gypsum board shaft-wall assemblies around openings and as required for blocking, bracing, and support of gravity and pullout loads of fixtures, equipment, services, heavy trim, furnishings, and similar items that cannot be supported directly by shaft-wall assembly framing.

Fully detail openings in shaft-wall assemblies. Manufacturers' written recommendations for framing elevator hoistway door openings differ. If retaining subparagraph below, revise to suit Project and assemblies selected. Insert requirements for other openings to suit Project.

1.	At elevator hoistway door frames, provide jamb struts on each side of door frame.

Fully detail support for items attached to shaft-wall assemblies; subparagraph below is an example. If retaining, indicate size of reinforcing plate on Drawings. Insert requirements for other items to suit Project.

2.	Where handrails directly attach to gypsum board shaft-wall assemblies, provide galvanized steel reinforcing strip with [0.0312-inch (0.79-mm)] <Insert thickness> minimum thickness of base (uncoated) metal, accurately positioned and secured behind at least 1 face-layer panel.

Delete paragraph below if no stair enclosures or if not applicable.

D.	Integrate stair hanger rods with gypsum board shaft-wall assemblies by locating cavity of assemblies where required to enclose rods.

Fully detail items penetrating shaft-wall assemblies on Drawings.

E.	At penetrations in shaft wall, maintain fire-resistance rating of shaft-wall assembly by installing supplementary steel framing around perimeter of penetration and fire protection behind boxes containing wiring devices, elevator call buttons, elevator floor indicators, and similar items.

Detail locations where finish panels abut structure on Drawings. See "Crack Control" Article in the Evaluations.

F.	Isolate gypsum finish panels from building structure to prevent cracking of finish panels while maintaining continuity of fire-rated construction.

Indicate control-joint locations and details on Drawings or insert here.

G.	Install control joints to maintain fire-resistance rating of assemblies.

Revise first paragraph below to suit Project and details shown on Drawings. Delete if sound or air leakage is not a concern.

H.	Seal gypsum board shaft walls with acoustical sealant at perimeter of each assembly where it abuts other work and at joints and penetrations within each assembly. Install acoustical sealant to withstand dislocation by air-pressure differential between shaft and external spaces; maintain an airtight and smoke-tight seal; and comply with manufacturer's written instructions or ASTM C 919, whichever is more stringent.

I.	In elevator shafts where gypsum board shaft-wall assemblies cannot be positioned within 2 inches (51 mm) of the shaft face of structural beams, floor edges, and similar projections into shaft, install 1/2- or 5/8-inch- (12.7- or 15.9-mm-) thick, gypsum board cants covering tops of projections.

1.	Slope cant panels at least 75 degrees from horizontal. Set base edge of panels in adhesive and secure top edges to shaft walls at 24 inches (610 mm) o.c. with screws fastened to shaft-wall framing.

2.	Where steel framing is required to support gypsum board cants, install framing at 24 inches (610 mm) o.c. and extend studs from the projection to the shaft-wall framing.

END OF SECTION 09265