Gypsum Board Shaft Wall Systems. CSI 3-Part Specifications.

SECTION 092750

GYPSUM BOARD SHAFT WALL SYSTEMS

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Use this guide specification to specify gypsum drywall Shaft Wall

systems by U. S. Gypsum Co. incorporating specially shaped light

gauge steel framing members for construction of fire-rated

partitions enclosing elevator shaftways, mechanical shaftways

stairways, etc. Review a copy of USG publication SA-926 before

editing specification.

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PART 1 - GENERAL

1.01 GENERAL DOCUMENTS:

General and Supplementary Conditions of Contract as well as

Drawings and general provisions of Contract and Division 1

Specification section, apply to work of this section.

1.02 DESCRIPTION OF WORK:

Extent of gypsum drywall Shaft Wall is shown on drawings and

schedules. Included are gypsum drywall shaftway enclosure

walls around elevator shafts, mechanical shafts, stairways,

etc.

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Include ceramic tile back-up materials if intended to be

installed under this section.

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Coordinate with all trades required to install work on or

into work of this section.

Related Work Specified Elsewhere

Stonework - Section 04400

Insulation - Section 07200

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THERMAFIBER Brand Sound Attenuation Fire Blankets used in Shaft

Wall stud cavity are usually included as part of this section.

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Sprayed-On Fireproofing - Section 07250

Hollow Metal Doors and Frames - Section 08100

Gypsum Board Systems - Section 09250

Painting - Section 09900

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For best final finish results specify all drywall surfaces to

receive a prime coat of SHEETROCK Brand First Coat primer in

accordance with U.S. Gypsum Co. directions after final joint

treatment and before finish painting.

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Include additional related sections as pertinent.

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1.03 QUALITY ASSURANCE:

Standards:

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-1002 Standard Specification for Steel Drill

Screws for the Application of Gypsum Board.

ASTM C-1047 Standard Specification for Accessories for

Gypsum Wallboard and Gypsum Veneer Base.

Fire-Resistance Rating: Where fire resistance rating is

required, provide materials and installation which are

identical with those of applicable assemblies tested per

ASTM E119 by fire testing laboratories acceptable to

authorities having jurisdiction.

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If mock-up is required identify location at the site, size

required and if special tests will be conducted relative to same

(e.g. sound tests).

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Unit Responsibility: Obtain gypsum drywall Shaftwall System

materials including fasteners, joint treatment products,

steel framing, etc. from a single manufacturer to ensure

consistency in quality of performance and appearance.

1.04 SUBMITTALS:

Product Data: Submit manufacturer's product specifications

and installation instructions for systems used.

Certificates: Submit certification of compliance with fire

and sound requirements indicated. Fire rating compliance

shall include verification of compatibility with labelled

elevator door frame installation and test verification of

call box and similar penetrations.

Provide additional certification as follows:

*Fire test verification of damper penetration

acceptability.

*Fire test verification of horizontal Shaft Wall

installation

*Test verification of fatigue failure resistance

through 1,000,000 cycles at a pressure of 7.5 psf and

a maximum deflection of l/240

*Code compliance documentation

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Copies of actual fire and sound test reports can be specified for

submittal.

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Samples: Furnish standard size sample of each linear or

continuous product, one standard hand sample of sheet

product, and one sample of all other components required for

project.

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Delete "Samples" paragraph if none required.

Include requirement for shop drawings if necessary.

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1.05 DELIVERY, STORAGE AND HANDLING:

Handling: Handle materials to avoid damage.

Delivery: Deliver materials to the jobsite in original

packages, containers, or bundles bearing the brand name and

manufacturer's identification.

Storage: Store materials in dry locations with adequate

ventilation, free from water, and in such a manner to permit

easy access for inspection and handling. Damaged or

deteriorated materials shall be removed from the site.

1.06 PROJECT CONDITIONS:

Protect adjacent work of other trades from moisture damage,

soiling, physical distress, etc. In cold weather during

gypsum panel joint finishing, temperatures within the

building shall be maintained within the range of 55 to 70F.

Provide adequate ventilation to carry-off excess moisture.

PART 2 - PRODUCTS

2.01 MANUFACTURER:

Subject to compliance with requirements, provide gypsum

drywall, steel framing, and all related components, as

manufactured or supplied by United States Gypsum Co.

2.02 MATERIALS:

A. Gypsum Panels (lengths as long as practical to

minimize number of joints):

SHEETROCK Brand (SW Edge)(FIRECODE Core) (FIRECODE C

Core) Gypsum Panels (1/2")(5/8")

B. Liner Board - 1" SHEETROCK Brand Gypsum Line Panels,

bevelled edge, 24" wide, lengths as required; water

resistant green paper; identified with UL

Classification Label

C. Cement Board: DUROCK Interior Cement Board; 1/2" thick,

36" wide, (48")(60")(72") long.

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DUROCK Exterior Cement Board; 1/2" thick, 4'x8' may be used for

interior applications.

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D. Steel Studs and Runners:

Selection shall be based on:

*Design Load: (5psf) (7.5psf) (10psf) (15psf)

*Allowable Deflection: (l/120)(l/240)(l/360)

*End Reaction and Bending Stress shall be

considered in determining limiting heights.

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l/120 accepted under certain code jurisdictions; l/240 suggested

for drywall and veneer plaster finishes; l/360 suggested for

finishes such as ceramic tile, marble,etc.

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USG Steel CH Studs -- Providing continuous edge support

for Liner Panel edges:

(212CH25) (212CH22) (212CH20) (400CH25) (400CH20)

hot-dipped galvanized, lengths as required.

USG Steel E-Studs -- Providing continuous edge support

for Liner Pane edges:

(212ES25) (212ES20) (400ES25) (400ES20) (600ES25)

(600ES20) hot-dipped galvanized, lengths as

required.

USG Steel J-Runners:

(212JR24) (212JR20) (400JR24) (400JR20) (600JR20)

hot-dipped galvanized.

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Select studs and runners from limiting height table in SA-926

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USG Steel Jamb Struts, (212JS20) (400JS20) (600JS20),

hot-dipped galvanized.

E. Metal Furring Materials:

(Unimast Metal Furring Channels)

(RC-1 Resilient Channels)

F. Corner reinforcement: (DUR-A-BEAD Corner Bead No.

[103][104]) (SHEETROCK No. 800)

G. Metal Trim: SHEETROCK Metal Trim No. (200-A

[1/2"][5/8"]) (200-B [1/2"][5/8"]) (400) (401) (402)

(801-A [1/2"][5/8"]) (801-B [1/2"][5/8"])

H. Control Joint: SHEETROCK Zinc Control Joint No. 093.

I. Screws:

SIZE: (3/8")(7/16")(1/2")(1")(1-1/4")(1-1/2")

(1-5/8")(2")(2-1/4")(2-1/2")(3")

Style: (framing - Type [S][S-12]) (drywall - Type S)

(self-drilling - Type S-12) (laminating - Type G)

Head: (bugle)(pan)(trim)(pancake)(low-profile)(mod.

truss)

Coating: (reg.)(corrosion-resistant)

DUROCK steel screws: (1-1/4")(1-5/8")

J. Joint Treatment: SHEETROCK Joint Tape. (SHEETROCK

Setting Type Joint Compound) (SHEETROCK Lightweight

Setting Type Joint Compound) (SHEETROCK Joint Compound

[Taping][Topping][All-Purpose]) (SHEETROCK Ready-Mixed

Joint Compound [Taping][Topping][All-Purpose])

(SHEETROCK Lightweight All-Purpose Joint Compound

Ready-Mixed - Plus 3)

K. Caulking: SHEETROCK Acoustical Sealant

L. Insulation: THERMAFIBER Sound Attenuation Fire

Blankets (1")(1-1/2")(2")(3") thick, 24"x48".

M. Runner Fasteners: power-driven type, to withstand 193

lb. single shear and 200 lb. bearing force when driven

through structural head or base and without exceeding

allowable design stress in runner, fastener or

structural support.

O. Organic Adhesive: Type 1 -- DURABOND D-2001 Multi

Purpose Ceramic Tile Mastic.

PART 3 EXECUTION:

3.01 PARTITION INSTALLATION:

3.01.1 Studs and Liner Panel Installation:

Attach steel runners at floor and ceiling, with short

leg toward finish side of wall, to structural elements

with suitable fasteners located 2" from each end and

spaced 24" o.c. With steel frame construction install

J-Runners and/or E-Studs on columns and beams before

application of spray-fireproofing. Remove fireproofing

from E-studs and J-Runners before installing gypsum

liner panels. For structural steel fireproofing

requirements greater than 2-hours use Z-shaped stand-

off clips secured to structural steel before

fireproofing application.

Cut liner panels 1" less than floor-to-ceiling height

and erect vertically between J-Runners. Where shaft

walls exceed maximum available panel length, position

liner panel end joints within upper and lower third

points of wall, and stagger joints top and bottom in

adjacent panels. Mate ends of Liner Panel for tight

fit. Screw attach studs to runners on walls over 16

ft. high.

Cut CH Studs 3/8" to not more than 1/2" less than

floor-to-ceiling height, and install between liner

panels with liner inserted in the groove. CH Studs

cannot be spliced. Install full length steel E-Studs

or J-Runners vertically at T-intersections, corners,

and columns. Install full length E-Studs over gypsum

liner panels both sides of closure panels. Frame

openings with vertical E-Stud or J-Runner at edges,

horizontal J-Runner at head and sill. Suitably frame

all openings to maintain structural support for wall.

Install floor-to-ceiling steel J-Runners or E-Studs

each side os steel hinged door frames and Jamb Struts

each side of elevator door frames to act as strut

studs. Attach strut stud to floor and ceiling runners

with two 3/8" Type S-12 pan head screws. Attach strut

studs to jamb anchors with 1/2" Type S-12 pan head

screws. Over steel doors install a cut-to-length

section of J-Runner and attach to strut studs with 3/8"

Type S-12 screws. Provide additional liner panels,

gypsum shims and fillers at elevator door frames as

necessary to maintain the fire integrity of the

labelled frame installation. Follow specific elevator

door frame manufacturer's fire test; secure copy of

fire test report from frame manufacturer and maintain

at site for elevator inspector.

3.01.2 Resilient Channel Installation:

Position RC-1 Resilient Channels at right angles to

steel studs, space 24" o.c. and attach to stud flanges

with 3/8" Type S pan head framing screws driven through

holes in channel mounting flange. Install channels

with mounting flange down. Locate channels within 6"

of floor and ceiling. Splice channels by nesting

directly over a stud; screw attach through both

flanges; reinforce with screws at both ends of splice.

Install 3" wide gypsum filler strips to top and bottom

runner.

3.01.3 Sound Attenuation Fire Blanket Installation:

Install THERMAFIBER Sound Attenuation Fire Blankets

after gypsum liner panels are installed; friction fit

in place.

3.01.4 Gypsum Panel Installation:

Single Layer; One-Hour: apply 5/8" SHEETROCK Brand

Gypsum Panels, FIRECODE C Core, on corridor side.

Position gypsum panel vertically and fasten to studs

and runners with 1" Type S screws 12" o.c.

Double Layer; Two Hour: apply base layer vertically to

studs with 1" Type S screws 24" o.c. along edges and in

the field of the panels. (Apply face layer vertically

and fasten to studs and J-Runners with 1-5/8" Type S

screws 12" along the edges and in the field, staggered

from screws in base layer. Joints between base and

face layers staggered.) (Apply face layer horizontally

and attach over base layer with 1-5/8" Type S screws

12" o.c. in the field, along the vertical edges and to

the floor and ceiling runners. Face layer attached to

base layer with 1-1/2" long Type G screws midway

between studs and 1" from the horizontal joint.)

Double Layer; Two Hour: apply gypsum panels vertically

to both sides of studs. Fasten gypsum panels with 1'

Type S screws 12" o.c. along the vertical edges and in

the field.

Double Layer; Two Hour With DUROCK Cement Board:

install 1-1/2" THERMAFIBER Sound Attenuation Fire

Blankets in stud cavity. Apply base layer of 5/8"

SHEETROCK Brand FIRECODE Core gypsum panels vertically

and attach with 1" Type S screws 24" oc. along the

vertical edges and in the field. Install face layer of

1/2" DUROCK Cement Board by lamination to gypsum panels

with 4-inch wide strip of DURABOND D- 2001 mastic

applied with 3/4" notched trowel midway between studs

and fasten to studs with

1-5/8" DUROCK Screws 6" o.c.

Double Layer; Two Hour Resilient: apply base layer to

resilient channels with end joints staggered; fasten

with 1" Type S screws 12" o.c. Apply face layer

vertically with joints staggered; fasten to channels

with 1-5/8" Type S screws 12" o.c.

Triple Layer; Three Hour: install three layers of

SHEETROCK Brand FIRECODE C Core gypsum panel vertically

on corridor side of studs. Fasten base layer with 1"

Type S screws 24" o.c along vertical edges and in the

field; mid-layer horizontally with joints staggered

with 1-5/8" Type S screws 24" o.c. along vertical edges

and in the field; face layer vertically with joints

staggered and fastened with 2- 1/4" Type S screws 16"

o.c. Attach face layer to J- Runners with 2-1/4" Type

S screws 12" o.c.

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Three-hour assembly tested with fire exposure on the shaft side.

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Multiple Layer; Four Hour: position second layer of

liner panels vertically over studs and fasten to studs

and runners with 1-5/8" Type S screws 24" o.c. Apply

5/8" SHEETROCK Brand FIRECODE C Core gypsum panels

vertically over liner panels and attach with 2-1/4"

Type S screws staggered from screws in liner panels,

spaced 24" o.c. and driven into studs.

Install metal furring channels horizontally over gypsum

panel and space 24" vertically. Fasten top channel to

studs and runner with 2-1/4" Type S screws 12" o.c. and

alternated on channel flanges. Fasten other channels

to studs with screws 24" o.c. in top channel flange.

Install second layer of 5/8" SHEETROCK Brand FIRECODE C

Gypsum Panels vertically over furring channels with

vertical joints staggered 24" from joints in first

layer. Fasten gypsum panels with 1" Type S screws 1"

from vertical edges, 12" o.c. in top channel and 24"

o.c. in other channels. Install face layer vertically

over second layer with vertical joints staggered 24"

and fasten to furring channels with 1-5/8" Type S

screws 12" o.c. into the channels.

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Four hour assembly tested with fire exposure on the corridor side

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Horizontal Installation; Two Hour: install three layers

of 1/2" SHEETROCK Brand FIRECODE C Core gypsum panels

to horizontally installed CH and/or E-Studs. Install

the base layer with the edges parallel to the studs and

attached with 1" Type S screws 24" o.c.; the mid layer

in the same manner with joints offset 2-feet and

attached with 1-5/8" Type S screws 24" o.c.; and the

face layer perpendicular to the studs and attached with

2-1/4" Type S screws spaced 12" o.c. Place face layer

end joints between studs and secure with 1-1/2" Type G

screws 8" o.c.

3.07 ACCESSORY APPLICATION:

3.07.1 Corner Bead - Reinforce all vertical and horizontal

exterior corners with corner bead fastened

with 9/16" galvanized staple 9" o.c. on both flanges

along entire length of bead.

3.07.2 Metal Trim - Where assembly terminates against masonry

or other dissimilar material, and where shown on

drawings, apply metal trim over panel edge and fasten

with 9/16" galvanized staple 9" o.c.

3.07.3 Control Joints - Break panel behind joint and back by

double framing members. Apply acoustical sealant to

fill gap and attach 093 Control Joint to face layer

with 9/16" galvanized staples 6" o.c. on both flanges

along entire length of joint.

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For fire-rated assemblies control joint must be properly backed-

up to maintain the fire integrity.

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3.07.4 Caulking - Apply SHEETROCK Brand Acoustical Sealant to

partition perimeters and around penetrations to

minimize whistling and dirt accumulation due to air

movement.

3.08 JOINT TREATMENT APPLICATION:

3.08.1 Gypsum Panel Joints:

Mix joint compound in strict accordance with

manufacturer's recommendations. Apply joint compound

in a thin uniform layer to all joints and angles to be

reinforced. Immediately apply joint tape centered over

joint and seated into compound. Sufficient compound -

appx. 1/64" to 1/32" - must remain under the tape for

proper bond. Follow immediately with a thin skim coat

to embed tape but not to function as a second coat.

Fold and embed tape properly in all interior angle to

provide a true angle. Allow embedding coat to dry

thoroughly prior to application of second coat.

Apply second coat of joint compound filling panel taper

flush with surface; cover tape and feather out at least

2" beyond first coat. On joints with no taper cover

the tape and feather out at least 4" on either side of

tape. Allow second coat to dry thoroughly prior to

application of finish coat.

Spread finish coat evenly over and extend at least 2"

beyond second coat on all joints and feather to a

smooth uniform finish. Apply a finish coat to cover

tape and taping compound at all tapered angles and

provide a true angle. Where necessary sand lightly

between coats and following the final application of

compound to provide a smooth surface ready for

decoration.

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Setting type joint compounds need only have hardened prior to

application of next coat.

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3.08.2 Finishing Fasteners:

Apply joint compound to fastener depressions as the

first coat. Follow with a minimum of two additional

coats of joint compound leaving all depressions level

with the surface.

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SHEETROCK Lightweight All Purpose Joint Compound Ready-Mixed

(PLUS 3) requires only one additional coat.

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3.08.3 Finishing Beads and Trim:

Apply first coat to all beads and trim and properly

feather out from ground to plane of surface. Allow

joint compound to thoroughly dry prior to application

of second coat

Apply second coat in same manner, extending compound

slightly beyond onto face panel. Allow to thoroughly

dry prior to application of finish coat.

Apply finish coat extending compound slightly beyond

second coat and properly feather from ground to

surface. Sand as necessary to provide a flat smooth

surface ready for decoration.

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SHEETROCK Lightweight All Purpose Joint Compound Ready-Mixed

(PLUS 3) requires only two coats.

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3.09 CLEAN-UP:

When gypsum drywall shaft wall work is completed remove

temporary protection and enclosure of other work.

Promptly remove joint compound from doors and frames,

windows and other surfaces. Remove unused materials

and equipment and clean floors of gypsum drywall and

framing debris.

End of Section 09270

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A limited license is extended to qualified design professionals

to duplicate and print this guide specification for the purpose

of incorporating products manufactured by U.S. Gypsum Co. into a

construction specification or purchase order.

Notice: We shall not be liable for incidental and consequential

damages, directly or indirectly sustained, nor for any loss

caused by application of these goods not in accordance with

current printed instructions or for other than the intended use.

Our liability is expressly limited to replacement of defective

goods. Any claim shall be deemed waived unless made in writing

to us within thirty (30) days from date it was or reasonably

should have been discovered.

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