July 22, 1994

Contract #TW0592

SPECIAL SPECIFICATION

SECTION 09250-S

[GYPSUM DRYWALL]{.underline}

Page

[PART 1 - GENERAL]{.underline}

1.01 Description Of Work 2

1.02 Design Requirements 2

1.03 Submittals 2

1.04 Quality Assurance 3

1.05 Delivery, Storage And Handling 3

1.06 Project Conditions 3

PART 2 - PRODUCTS

2.01 Manufacturers 3

2.02 Steel Framing Components For Suspended And Furred Ceilings 4

2.03 Steel Framing For Walls And Partitions 4

2.04 Gypsum Board 5

2.05 Trim Accessories 6

2.06 Gypsum Board Joint Treatment Materials 7

2.07 Miscellaneous Materials 7

PART 3 - EXECUTION

3.01 Installation Of Steel Framing 8

3.02 Installation Of Steel Framing For Suspended And Furred Ceilings 8

3.03 Installation Of Steel Framing For Walls And Partitions 9

3.04 Application And Finishing Of Gypsum Board 9

3.05 Methods Of Gypsum Drywall Application 10

3.06 Installation Of Drywall Trim Accessories 11

3.07 Installation Of Miscellaneous Materials 12

3.08 Finishing Of Drywall 12

SPECIAL SPECIFICATION

SECTION 09250-S

[GYPSUM DRYWALL]{.underline}

# PART 1 - GENERAL

## 1.01 [DESCRIPTION OF WORK]{.underline}

A. [Extent]{.underline} of each type of gypsum drywall construction
required is indicated on contract drawings. This section includes the
following types of gypsum board construction:

1\. Light-gauge, non-load bearing steel framing members.

2\. Gypsum board screw-attached to steel framing and furring members.

B. [Related Sections]{.underline}: Sound attenuation blankets are
specified in Division 7, Section \"Building Insulation\".

## 1.02 [DESIGN REQUIREMENTS]{.underline}

A. Provide partitions and suspended ceilings adequately braced for
seismic conditions as identified in Uniform Building Code, Chapter 47,
"Installation of Wall and Ceiling Coverings."

## 1.03 [SUBMITTALS]{.underline}

A. [Product Data]{.underline}: Submit product information from
manufacturers for each type of product specified.

B. [Material Safety Data Sheets (MSDS)]{.underline}: Submit MSDS for all
gypsum board products.

C. [Shop Drawings]{.underline}: Submit details of seismic bracing
proposed for use at suspended ceilings and at vertical partitions not
braced to structural system.

D. Submit shop drawings to illustrate each different condition. Include
installation details, inside and outside corners, control joints,
penetrations, etc. Indicate control joint locations on floor plans.

## 1.04 [QUALITY ASSURANCE]{.underline}

A. [Fire-Resistance Rating]{.underline}: Where gypsum drywall systems
with fire-resistance ratings are indicated, provide materials and
installations identical with applicable assemblies which have been
tested and listed by UL.

B. [Manufacturer]{.underline}: Obtain gypsum board products from a
single manufacturer or from manufacturers recommended by the prime
manufacturer of gypsum boards.

> Manufacturers offering products which may be incorporated in the work
> are those who have been in business successfully for at least 5 years
> without record of product failure.

C. [Products]{.underline}: All gypsum board products, including joint
compounds, tapes, sealants, adhesives, and texturing products shall not
contain any asbestos fibers.

## 1.05 [DELIVERY, STORAGE AND HANDLING]{.underline}

[Deliver and store materials]{.underline} in manufacturer\'s original
unopened packages, clearly marked with identifying information. Protect
materials as recommended by the manufacturer.

## 1.06 [PROJECT CONDITIONS]{.underline}

A. [Environmental Conditions]{.underline}: Establish and maintain
environmental conditions for application and finishing of gypsum board
to comply with ASTM C 840 and with gypsum board manufacturer\'s
recommendations.

B. [Minimum Room Temperatures]{.underline}: For attachment of gypsum
board to framing, maintain not less than 40 degrees F. For finishing of
gypsum board, maintain not less than 50 degrees F for 48 hours prior to
application, and continuously thereafter until drying is complete.

C. [Ventilation]{.underline}: Ventilate building spaces to remove water
not required for drying joint treatment materials. Avoid drafts during
dry, hot weather to prevent materials from drying too rapidly.

# PART 2 - PRODUCTS

## 2.01 [MANUFACTURERS]{.underline}

A. [Available Manufacturers]{.underline}: Subject to compliance with all
requirements, manufacturers offering products which may be incorporated
in the work include but are not limited to the following:

1\. [Steel Framing and Furring]{.underline}:

Dale Industries, Inc.

Dietrich Industries

> Gold Bond Building Products Division, National Gypsum Co. Unimast,
> Inc.

United States Gypsum Co.

2\. [Grid Suspension System]{.underline}:

Chicago Metallic Corp.

National Rolling Mills Co.

3\. [Gypsum Boards and Related Products]{.underline}:

Georgia Pacific Corp.

Gold Bond Building Products Division, National Gypsum Co.

United States Gypsum Co.

4\. [Bullnose Corner Bead]{.underline}:

Beadex

## 2.02 [STEEL FRAMING COMPONENTS FOR SUSPENDED AND FURRED CEILINGS]{.underline}

A. [General]{.underline}: Provide components which comply with ASTM C
754 for materials and sizes, unless otherwise indicated.

B. [Main Runners]{.underline}: Hot or cold-rolled steel channels with
rust inhibitive paint finish.

C. [Hanger Wire]{.underline}: ASTM A 641, soft, Class 1 galvanized,
minimum 9 gauge.

D. [Hanger Anchorage Devices]{.underline}: Screws, clips, bolts,
cast-in-place concrete inserts or other devices applicable to the
indicated method of structural anchorage for ceiling hangers. Size
devices for 3 times the calculated load supported, except size direct
pull-out concrete inserts for 5 times the calculated loads.

E. [Steel Rigid Furring Channels]{.underline}: ASTM C 645, hat-shaped,
depth of 7/8 inch; mininum 25 gauge thickness, unless otherwise
indicated.

F. [Grid Suspension System]{.underline}: ASTM C 645, manufacturer\'s
standard grid suspension system composed of main beams and cross furring
members which interlock to form a modular supporting network.

## 2.03 [STEEL FRAMING FOR WALLS AND PARTITIONS]{.underline}

A. [Steel Studs and Runners]{.underline}: ASTM C 645, galvanized, 25
gauge thickness unless otherwise indicated. 20 gauge at door jambs and
for support of restroom fixtures.

1\. [Depth of Section]{.underline}: 3-5/8 inch or as shown on drawings.

2\. [Runners]{.underline}: Match studs; type recommended by stud
manufacturer for floor and ceiling support of studs, and for vertical
abutment of drywall work at other work.

B. [Steel Rigid Furring Channels]{.underline}: ASTM C 645, hat-shaped,
galvanized; minimum depth of 7/8 inch and minimum 25 gauge thickness,
unless otherwise indicated.

C. [Z-Furring Members]{.underline}: Manufacturer\'s standard zee-shaped
furring members fabricated from hot-dip galvanized steel sheet complying
with ASTM A 525, Coating Designation G60; minimum 25 gauge thickness,
face flange of 1-1/4 inch, wall-attachment flange of 7/8 inch, and of
depth required to fit insulation thickness indicated.

D. [Fasteners]{.underline}: Type and size recommended by gypsum drywall
manufacturer for the substrate and application indicated.

## 2.04 [GYPSUM BOARD]{.underline}

A. [General]{.underline}: Provide gypsum board of type, edge
configuration, and thickness indicated, in maximum lengths available to
minimize end-to-end butt joints.

B. For interior applications on walls and ceilings, provide the
following: 1. [Fire-Resistive Board]{.underline}: ASTM C 36, and unless
otherwise indicated:

2\. [Type]{.underline}: Type \"X\".

3\. [Edges]{.underline}: Tapered.

4\. [Thickness]{.underline}: 5/8 inch at ceilings and walls.

C. For applications as Substrate for Exterior Insulation Finish System
(EIFS), provide the following:

1\. Walls: Exterior grade gypsum sheathing

a\. ASTM C 79

b\. Thickness: 1/2 inch

c\. Edge: T & G

2\. Ceilings: Exterior grade gypsum ceiling board

a\. ASTM C 931

b\. Thickness: 1/2 inch

c\. Edge: T & G

D. For rework at prototyping area

1\. ASTM C 931

2\. Type: X

3\. Thickness: 5/8 inch

4\. Edge: T & G

E. Thermal Barrier: Where used as thermal barrier under polyisocyanurate
insulation, provide the following:

1\. ASTM C 79

2\. Type: X

3\. Thickness: 5/8 inch

4\. Edge: Square

> 2.05 [TRIM ACCESSORIES]{.underline}

A. [Cornerbead and Edge Trim]{.underline}: Provide cornerbeads, edge
trim, and control joints which comply with ASTM C 1047 and requirements
indicated below:

1\. [Material]{.underline}: Unless otherwise indicated, galvanized steel
with either knurled and perforated or expanded flanges, and beaded for
concealment of flanges in joint compound.

2\. [Edge trim shapes]{.underline} indicated below by reference to
designations of Figure 1 in ASTM C 1047:

a\. \"L\" Bead

b\. \"U\" Bead

c\. \"LK\" Bead

B. [Control Joint]{.underline}: Provide one piece control joint formed
with vee-shaped slot per Figure 1 in ASTM C 1047, with slot opening
covered with removable strip.

## 2.06 [GYPSUM BOARD JOINT TREATMENT MATERIALS]{.underline}

A. [General]{.underline}: Provide materials complying with ASTM C 475,
ASTM C 840 and type recommended by the manufacturer for the application
indicated, except as otherwise indicated.

B. [Joint Tape]{.underline}: Paper reinforcing or fiberglass tape.

C. [Setting-Type Joint Compound]{.underline}: Factory-prepackaged,
job-mixed, chemical-hardening powder products formulated for bedding and
filling.

> For filling joints and treating fasteners and cut edges of
> water-resistant gypsum backing board, use formulation recommended by
> gypsum board manufacturer.

D. [Drying-Type Joint Compounds]{.underline}: Factory-prepackaged,
vinyl-based, ready-mix or job-mixed products formulated for taping and
topping.

## 2.07 [MISCELLANEOUS MATERIALS]{.underline}

A. [General]{.underline}: Provide auxiliary materials for gypsum drywall
construction which comply with referenced standards and the
recommendations of the gypsum board manufacturer.

B. [Gypsum Board Screws]{.underline}: ASTM C 1002.

C. [Acoustical Sealant]{.underline}: Water base, non-drying,
non-bleeding, non-staining type and permanently elastic. Comply with
requirements specified in Division 7, Section \"Joint Sealants\", and as
recommended by the gypsum board manufacturer for application indicated.

D. [Texturing Products]{.underline}: As recommended by gypsum board
manufacturer for satisfactory \"spatter\" spray texturing. Provide other
textures as indicated on drawings or schedules.

E. [Corner Guards]{.underline}: Provide surface-mounted corner guards on
all corridor walls and other high impact areas as indicated on drawings.
Where corner guards are required on fire-resistive walls, provide
surface or flush-mounted type that are UL listed.

1\. Corner guards shall consist of a continuous extruded aluminum
retainer, top and bottom high impact nylon closer caps, and a
vinyl/acrylic guard.

2\. Guard length shall be a minimum of 4\'-0\".

3\. Wall thickness of .110 inch and angle-shaped with 3 inch legs and
1/4 inch radius at corners and ends.

4\. Furnish guard in matte finish from manufacturer\'s standard color
line. Closure caps shall be of the same color as the guards. Color to be
selected from color selection charts provided by the manufacturer.

F. [Chair Rails]{.underline}: Provide surface-mounted chair rails on all
conference room walls and as indicated on drawings.

1\. Chair rails shall consist of a wood rail painted to match wall.

2\. Provide rails with a minimum overall height of 3-1/2 inches and
overall depth of 7/8 inch.

G. [Bullnose Corner Bead]{.underline}: Provide nail-on corner bead as
manufactured by Beadex.

1\. Style: Danish N, 1-1/2 Softline.

2\. Size: 1-1/2 inch

# PART 3 - EXECUTION

## 3.01 [INSTALLATION OF STEEL FRAMING]{.underline}

A. Comply with provisions of UBC Articles 4703 and 4704.

B. [Steel Framing Installation Standard]{.underline}: Install steel
framing to comply with ASTM C 754 and with ASTM C 840 requirements that
apply to framing installation.

C. [Install supplementary framing, blocking and bracing]{.underline} at
terminations in the construction and for support of fixtures, equipment
services, heavy trim, grab bars, toilet accessories, furnishings, and
similar construction to comply with details indicated and with
recommendations of gypsum board manufacturer.

D. [Isolate steel framing]{.underline} from building structure where
edges of suspended ceilings abut building structure horizontally at
ceiling perimeters, at penetration of structural elements, and where
partition and wall framing abuts overhead structure.

E. [Do not]{.underline} bridge building expansion and control joints
with steel framing or furring members.

## 3.02 [INSTALLATION OF STEEL FRAMING FOR SUSPENDED AND FURRED CEILINGS]{.underline}

A. [Secure hangers]{.underline} to structural support by connecting
directly to structure where possible, otherwise connect to inserts,
clips or other anchorage devices or fasteners as indicated on drawings.

B. [Space main runners]{.underline} 4\'-0\" and hangers 4\'-0\" o.c.
along runners, unless otherwise indicated.

C. [Installation Tolerances]{.underline}: Install steel framing
components for suspended ceilings so that cross furring members or grid
suspension members are level to within 1/8 inch in 12\'-0\", measured
lengthwise on each member and transversely between parallel members.

D. [Grid Suspension System]{.underline}: Attach perimeter wall track or
angle where grid suspension system meets vertical surfaces. Mechanically
join main beam and cross furring members to each other and butt-cut to
fit into wall track.

E. [Attach perimeter wall track or angle]{.underline} wherever support
system meets vertical surfaces.

F. Cross runners supported with 12-gage vertical wires attached to the
building structure shall be provided at each end of each surface-mounted
lighting fixture.

## 3.03 [INSTALLATION OF STEEL FRAMING FOR WALLS AND PARTITIONS]{.underline}

A. [Install runners]{.underline} (tracks) at floors, ceilings and
structural walls, and columns where gypsum drywall stud system abuts
other work.

B. [Installation Tolerances]{.underline}: Install each steel framing and
furring member so that the fastening surface do not vary more than 1/8
inch from plane of faces of adjacent framing.

C. [Extend partition framing]{.underline} full height to structural
supports or substrates above suspended ceilings, except where partitions
are indicated to terminate at suspended ceilings. Where partitions
terminate below ceilings or just above ceiling without extending to
structure, provide lateral bracing. Continue framing for doors and
openings, and frame around ducts penetrating partitions above ceiling to
provide support for gypsum board.

D. [Space studs and wall furring]{.underline} at 16 inches o.c., except
as otherwise indicated. Attach studs to top and bottom tracks by button
punch or screws, except that studs located adjacent to doors, windows,
partition intersections or ends, and at corners shall be screwed to
tracks.

E. [Frame door openings]{.underline} with vertical studs securely
attached by screws at each jamb either directly to frames or to jamb
anchor clips on door frame; install runner track sections (for jack
studs) at head and secure to jamb studs.

F. [Frame openings other than door openings]{.underline} in same manner
as required for door openings, and install framing below sills of
openings to match framing required above door heads.

## 3.04 [APPLICATION AND FINISHING OF GYPSUM BOARD]{.underline}

A. Install walls in strict accordance with indicated UL assemblies.

B. [Gypsum Board Application and Finishing Standard]{.underline}:
Install and finish gypsum board to comply with ASTM C 840.

C. [Install ceiling boards]{.underline} in the direction and manner
which will minimize the number of end-butt joints, and which will avoid
end joints in the central area of each ceiling. Stagger end joints at
least 12 inches.

D. [Install wall/partition]{.underline} boards vertically to avoid
end-butt joints wherever possible.

E. [Install exposed gypsum board]{.underline} with face side out. Do not
install imperfect, damaged or damp boards. Butt boards together for a
light contact at edges and ends with not more than 1/16 inch open space
between boards. Do not force into place.

F. [Locate either edge or end joints]{.underline} over supports.
Position boards so that like edges abut, tapered edges against tapered
edges and mill-cut or field-cut ends against mill-cut or field-cut ends.
Stagger vertical joints over different studs on opposite sides of
partitions.

G. [Attach gypsum board to framing and blocking]{.underline} as required
for additional support at openings and cutouts.

H. [Form control joints]{.underline} and expansion joints with space
between edges of boards, prepared to receive trim accessories.

I. [Isolate perimeter]{.underline} of non-load bearing drywall
partitions at structural abutments. Provide 1/4 to 1/2 inch space and
trim edge with \"U\" bead trim. Seal joints with acoustical sealant. Do
not fasten drywall directly to stud system runner tracks.

J. [Where sound attenuation drywall construction]{.underline} is
indicated, seal the work at perimeters, control and expansion joints,
openings, and penetrations with a continuous bead of acoustical sealant
including a bead at both faces of partitions. Comply with
manufacturer\'s recommendations for location of beads and close off
sound-flanking paths around or through the work.

K. [Space fasteners]{.underline} in gypsum boards in accordance with
manufacturer\'s recommendations.

## 3.05 [METHODS OF GYPSUM DRYWALL APPLICATION]{.underline}

A. [Single-Layer Application]{.underline}: Install gypsum wallboard as
follows:

1\. On ceilings, apply gypsum board prior to wall/partition board
application to the greatest extent possible.

2\. On partitions/walls, apply gypsum board vertically (parallel to
framing), unless otherwise indicated and provide sheet lengths which
will minimize end joints.

3\. On Z-furring members, apply gypsum board vertically (parallel to
framing) with no end joints. Locate edge joints over furring members.

B. [Wall Tile Base]{.underline}: Where drywall is base for thin-set
ceramic tile and similar rigid applied wall finishes, install gypsum
backing board.

> At showers, tubs and similar \"wet\" areas, install water-resistant
> backing board. Apply with un-cut long edge at bottom of work, and
> space 1/4 inch above fixture lips. Seal ends, cut-edges, and
> penetrations of each piece with water-resistant compound before
> installation.

D. [Double-Layer Application]{.underline}: Install gypsum backing board
for base layer and gypsum board for face layer.

1\. On ceilings, apply base layer prior to application of base layer on
walls/partitions; apply face layers in same sequence. Offset joints
between layers at least 10 inches.

2\. On partitions/walls apply base layer and face layers vertically
(parallel to framing) with joints of base layer over supports, and with
face layer joints offset at least 10 inches with base layer joints.

3\. On Z-furring members apply base layer vertically (parallel to
framing), and face layer either vertically (parallel to framing) or
horizontally (perpendicular to framing) with vertical joints offset at
least one furring member. Locate edge joints of base layer over furring
members.

E. [Single-Layer Fastening Methods]{.underline}: Apply gypsum boards to
supports with screws.

F. [Double-Layer Fastening Methods]{.underline}: Apply base layer of
gypsum board and face layer to base layer by fastening both base layers
and face layers separately to supports with screws.

## 3.06 [INSTALLATION OF DRYWALL TRIM ACCESSORIES]{.underline}

A. [General]{.underline}: Where feasible, use the same fasteners to
anchor trim accessory flanges as required to fasten gypsum board to the
supports.

B. [Install metal corner beads]{.underline} at external corners of
drywall work.

C. [Install metal edge trim]{.underline} whenever edge of gypsum board
would otherwise be exposed or semi-exposed. Provide type with face
flange to receive joint compound except where \"U\" bead
(semi-finishing) type is indicated.

1\. Install \"L\" bead where work is tightly abutted to other
construction.

2\. Install special \"LK\" bead where other work is kerfed to receive
long leg of \"L\" bead trim.

3\. Install \"U\" bead where edge is exposed, revealed, gasketed, or
sealant-filled (including expansion joints).

D. [Install \"U\" bead]{.underline} trim where indicated, and where
exterior gypsum board edges are not covered by applied moldings.

E. [Install control joints]{.underline} at locations indicated, or if
not indicated, at spacings and locations required by referenced gypsum
board application and finish standard.

## 3.07 [INSTALLATION OF MISCELLANEOUS MATERIALS]{.underline}

A. [Install]{.underline} each item in accordance with the
manufacturer\'s directions and recommendations. Use anchors and other
fasteners supplied by the manufacturer which match the finish of the
items. Install all items plumb or level.

B. [Mount chair rails]{.underline} at 2\'-6 1/2\" above finished floor
level.

## 3.08 [FINISHING OF DRYWALL]{.underline}

A. [General]{.underline}: Apply treatment at gypsum board joints (both
directions), flanges of trim accessories, penetrations, fastener heads,
surface defects, and elsewhere as required to prepare work for
decoration.

1\. Prefill any open joints and rounded or beveled edges using type of
compound recommended by the manufacturer.

2\. Apply joint tape at joints between gypsum boards, except where trim
accessories are indicated.

3\. Finish interior gypsum board by applying joint compound in three
coats (not including prefill of openings in base), and sand between
coats and after last coat.

B. [Base for Acoustical Tile]{.underline}: Where gypsum board is
indicated as a base for adhesively-applied acoustical tile, install tape
and 2-coat compound treatment, without sanding.

C. [Water-Resistant Gypsum Board Base for Ceramic Tile]{.underline}:
Treat joints and fasteners to comply with directions of water-resistant
joint compound manufacturer.

1\. In areas to be tiled, treat fastener heads with water-resistant
joint compound.

a\. Fill tapered edges in gypsum panels with water-resistant joint
compound, embed joint tape firmly, and wipe off excess compound.

b\. Follow immediately with a second coat of water-resistant joint
compound over taping coat, being careful not to crown the joint.

c\. Fold and embed tape in all interior angles to form true angle.

2\. In areas not to be tiled, treat fastener heads and embed tape as
indicated above, using water-resistant joint compound. Finish with two
coats of joint compound used for regular gypsum board work.

D. [Fire-rated Gypsum Board]{.underline}: Tape and bed all joints
including all layers of multiple layer applications.

E. [Surface Texturing]{.underline}: All gypsum board surfaces exposed in
finish areas shall be textured. Finish areas are those specified to be
painted and as scheduled on the drawings.

1\. Texture shall be a \"spatter\" spray application unless otherwise
approved.

2\. Spray shall be applied to produce a uniform texture without starved
spots or other evidence of thin application.

END OF SECTION