**November 21, 1997**

Contract \# **TW-0928**AQ-1486A

SPECIAL SPECIFICATION

SECTION 09250-S

[GYPSUM DRYWALL]{.underline}

Page

[PART 1 - GENERAL]{.underline}

1.01 Description Of Work

1.02 Submittals

1.03 Quality Assurance 3

1.04 Delivery, Storage And Handling

1.05 Project Conditions

PART 2 - PRODUCTS

2.01 Manufacturers

2.02 Steel Framing Components For Suspended And Furred Ceilings

2.03 Steel Framing For Walls And Partitions

2.04 Gypsum Board

2.05 Trim Accessories

2.06 Gypsum Board Joint Treatment Materials

2.07 Miscellaneous Materials

PART 3 - EXECUTION

3.01 General, Installation Of Steel Framing

3.02 Installation Of Steel Framing For Suspended And Furred Ceilings

3.03 Installation Of Steel Framing For Walls And Partitions

3.04 Application And Finishing Of Gypsum Board

3.05 Methods Of Gypsum Drywall Application

3.06 Installation Of Drywall Trim Accessories

3.07 Installation Of Miscellaneous Materials

3.08 Finishing Of Drywall

3.09 Surface Preparation And Primer

3.10 Cleaning And Protection

3.11 Flat Strapping Schedule 14

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 documents. 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.

3\. Horizontal and vertical shaft wall systems.

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

## 1.02 [SUBMITTALS]{.underline}

A. [General]{.underline}: Submit the following in accordance with
provisions of Section 1300-S, "Descriptive Submittals."

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

C. [Corner Guards]{.underline}: Submit floor plans showing proposed
locations of corner guards.

D.  [Gypsum Drywall Bracing Plan:]{.underline} Submit a plan showing
    proposed horizontal partition bracing for all floors and all walls
    terminating below elevated slabs. Show member size, gauge and
    spacing in addition to location on floor plan.

E.  [Flat Strapping Coordination Plan:]{.underline} Submit a plan
    showing proposed locations of flat strapping in walls. Color code ¼"
    scale architectural floor plans to show laboratory walls and office
    walls that receive flat strapping, and mounting heights.

## 1.03 [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.

## 1.04 [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.

## 1.05 [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. [Manufacturers]{.underline}: Products made by the following
manufacturers, provided they comply with requirements of Contract
documents, are those considered acceptable. However, it is the
Contractor's responsibility to provide only products compatible with
adjacent materials in the assembly.

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

Dale Industries, Inc.

Dietrich Industries, Inc.

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

United States Gypsum Co.

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

Armstrong World Industries, Inc.

Chicago Metallic Corp.

United States Gypsum Co.

Worthington Steel Company (formerly National Rolling Mills Co.)

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

Georgia Pacific Corp.

> National Gypsum Co.; Gold Bond Building Products Division

United States Gypsum Co.

B. [Substitutions]{.underline}: only under provisions of Section 1600-S.

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

## 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 unless otherwise shown on
drawings. See wall types sheet 105634/A1.

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.

3\. [Flat Strap Bracing:]{.underline} Provide 14 gauge x 6" wide flat
strap bracing at heights identified in Article 3.11 Flat Strapping
Schedule.

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. Steel C-H Studs (Shaft Wall Assemblies): C-H shape, galvanized, depth
of 2-1/2 inches and 4 inches as required, minimum 20 gauge, unless
otherwise 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. [Gypsum Board]{.underline}: ASTM C 36, and unless otherwise
indicated:

1\. [Type]{.underline}: Regular.

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

3\. [Thickness]{.underline}: 1/2 inch at ceilings.

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

C. [Fire-Resistive Board]{.underline}: ASTM C 36, and unless otherwise
indicated:

1\. [Type]{.underline}: Type 'X.'

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

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

D. [Gypsum Backing Board]{.underline}: ASTM C 36 where indicated on
Contract documents as base layer for multilayer application. Unless
otherwise indicated:

1\. [Type]{.underline}: Regular or Type 'X' for fire-resistance-rated
assemblies.

2\. [Edge]{.underline}: Tapered.

3\. [Thickness]{.underline}: 1/2 inch non-fire rated or 5/8 inch at fire
rated applications.

E. [Water-Resistant Backing Board]{.underline}: ASTM C 630, and use
where indicated on drawings. Unless otherwise indicated:

1\. [Type]{.underline}: Regular or Type \"X\" for fire-resistance-rated
assemblies.

2\. [Edge]{.underline}: Tapered.

3\. [Thickness]{.underline}: 5/8 inch.

F. [Gypsum Sheathing Board]{.underline}: ASTM C 79, and unless otherwise
indicated:

1\. [Type]{.underline}: Regular or Type 'X.'

2\. [Edges]{.underline}: Square.

3\. [Thickness]{.underline}: 1/2 inch at regular, 5/8 inch at fire rated
applications.

## 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.

C. [Ready-Mixed Taping Joint Compound]{.underline}: Pre-mixed,
non-asbestos, vinyl based compound formulated for tape application,
fastener spotting, first fill coat on metal beads and trim and filling.

D. [Ready-Mixed Topping Joint Compound]{.underline}: Pre-mixed,
non-asbestos, vinyl based compound for second and third coats over taped
joints, fastener spottings and the finish coat over metal beads and trim
.

E. [Drywall Primer]{.underline}: A flat latex based prime coat to
equalize the texture and porosity differences between joint compound and
drywall.

## 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. [Powder Texturing Product]{.underline}: Non-asbestos powder product,
mixed with water for producing a satisfactory "spatter" spray texture.
Provide other textures as indicated in Contract documents.

E. [Corner Guards]{.underline}: Provide surface-mounted corner guards on
all corridor walls and other high impact areas. 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 pre-finished
vinyl/acrylic (unless material noted otherwise on drawings) chair rails
on all conference room walls and as indicated on drawings.

1\. Chair rails shall consist of a continuous extruded aluminum
retainer, end and corner transitions, and a vinyl/acrylic rail.

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

3\. Color: As chosen from manufacturer's standard color charts at time
of submittals.

# PART 3 - EXECUTION

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

A. [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.

B. [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.

C. [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.

D. [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.

## 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. Where interior lab
partitions are indicated to terminate below elevated slabs provide
horizontal bracing to walls which terminate at elevated slabs. Continue
framing for doors and openings, and frame around ducts penetrating
partitions above ceiling to provide support for gypsum board.

> Size bracing to resist a lateral load of 5 psf acting normal to the
> partition wall.

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

B. [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.

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

D. [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.

E. [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.

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

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

H. [Isolate perimeter]{.underline} of non-load bearing drywall
partitions at structural abutments. Provide 1/4 to 1/2 inch wide spaces
and trim edges with "U"-bead trim where edges of drywall panels are
exposed. Seal joints between edges and abutting structural surfaces with
acoustical sealant. Do not fasten drywall directly to stud system runner
tracks.

I. [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.

J. [Space fasteners]{.underline} in each layer of gypsum board in
accordance with manufacturer\'s recommendations, Uniform Building Code,
and published U.L. or other published assemblies.

## 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.

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.

C. [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.

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

E. [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 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 over gypsum board joints, except those with trim
accessories having flanges not requiring tape. Do not apply joint tape
to the base layer in a double layer application, except as required to
meet specified fire-resistive assemblies, U.B.C., and elsewhere as noted
on Contract documents.

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.

4\. Apply drywall primer to joints as recommended by primer
manufacturer.

B. [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.

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

D. [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 inthe. Room Finish Schedule Section 09000.

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

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

## 3.09 [SURFACE PREPARATION AND PRIMER]{.underline}

[Prepare and apply drywall]{.underline} [primer]{.underline} to gypsum
board and other surfaces prior to receiving texture finishes according
to texture finish manufacturer's instructions. Apply primer only to
surfaces that are clean, dry and smooth.

## 3.10 [CLEANING AND PROTECTION]{.underline}

A. [Promptly remove any residual joint compound]{.underline} from
adjacent surfaces not indicated to receive texture.

B.  [Provide final protection]{.underline} and maintain conditions, in a
    manner acceptable to Installer, that ensure gypsum board assemblies
    are without damage or deterioration at the time of Substantial
    Completion.

C.  Flat Strapping Schedule

D.  Laboratory Walls: Mount flat strapping on all four walls within
    laboratories and CFZ's at the following heights: 15 inches, 57
    inches and 81 inches above finished floor.

E.  Office Walls: Mount flat strapping on all four walls within offices
    and conference rooms at the following heights: 6 inches, 32 inches
    and 65 inches above finished floor

F.  See wall type Sheet 105634/A1 for walls to receive strap bracing.

END OF SECTION