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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Copyright 1991 by U.S. Gypsum Co.
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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