SPECIAL SPECIFICATION

SECTION 09262

[GYPSUM SHEATHING]{.underline}

Page

PART 1 - GENERAL

1.01 Related Documents
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...
2

1.02 References
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....
2

1.03 Summary
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....
2

1.04 Definitions
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...
3

1.05 Submittals
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....
3

1.06 Quality Assurance
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....
3

1.07 Delivery, Storage and Handling
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...
3

1.08 Sequencing and Scheduling
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....
3

PART 2 - PRODUCTS

2.01 Gypsum Sheathing Board
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...
4

2.02 Accessory Materials
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....
4

PART 3 - EXECUTION

3.01 Installation
\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....
5

SPECIAL SPECIFICATION

SECTION 09262

[GYPSUM SHEATHING]{.underline}

PART 1 - GENERAL

1.01 [RELATED DOCUMENTS]{.underline}

A. Drawings and general provisions of Contract, including General and
Supplementary Conditions and Division 1 Specification sections, apply to
this section.

1.02 [REFERENCES]{.underline}

A. [American Society for Testing and Materials (ASTM)]{.underline}

C 79 Specification for Gypsum Sheathing Board

C 954 Specification for Steel Drill Screws for the Application of Gypsum
Board or Metal Plaster Bases to Steel Studs from 0.033 in. (0.84 mm) to
0.112 in. (2.84 mm) in Thickness

C 1002 Specification for Steel Drill Screws for the Application of
Gypsum Board or Metal Plaster Bases

1.03 [SUMMARY]{.underline}

A. This Section includes the following applications of gypsum sheathing.

1\. Gypsum sheathing on steel studs in exterior walls (behind exterior
finish).

B. [Related Sections]{.underline}: The following sections contain
requirements that relate to this section:

1\. Division 5 Section \"Cold-Formed Metal Framing\" for steel framing
of walls covered with gypsum sheathing.

2\. Division 7 Section \"Flashing and Sheet Metal\" for flashing applied
in conjunction with gypsum sheathing.

3\. Division 7 Section \"Joint Sealers\" for sealants applied in
conjunction with gypsum sheathing.

1.04 [DEFINITIONS]{.underline}

A. [Gypsum Board Construction Terminology Standard]{.underline}: Refer
to ASTM C 11 and GA 505 for definitions of terms for gypsum board
construction not otherwise defined in this section or other referenced
standards.

1.05 [SUBMITTALS]{.underline}

A. Product data for each grade of gypsum sheathing indicated.

B. Research reports or evaluation reports of model code organization
acceptable to authority having jurisdiction which evidence compliance of
air infiltration barrier with building code in effect for Project.

1.06 [QUALITY ASSURANCE]{.underline}

A. [Single Source Responsibility]{.underline}: Obtain gypsum sheathing
from one source from a single manufacturer.

B. All materials used shall not contain asbestos fibers or lead.

1.07 [DELIVERY, STORAGE AND HANDLING]{.underline}

A. Deliver gypsum sheathing board and related materials in original
packages bearing brand name and identification of manufacturer.

B. Store gypsum sheathing board so that it is protected against damage
from weather, direct sunlight, surface contamination, corrosion,
construction traffic, and other causes. Neatly stack gypsum sheathing
boards flat on leveled supports off the ground under protective
covering.

C. Handle gypsum sheathing board to prevent damage to edges, ends, and
surfaces.

1.08 [SEQUENCING AND SCHEDULING]{.underline}

A. Sequence installation of gypsum sheathing board with installation of
exterior cladding to comply with requirements indicated below:

1\. Do not leave gypsum sheathing board exposed to the weather after
application for longer than one month.

a\. Protect cutouts, corners and joints in the sheathing by filling them
with a flexible sealant at the time sheathing is applied.

b\. As an alternate to sealant application, cover exposed exterior
surface of sheathing with building paper or air infiltration barrier.
Anchor covering with metal lath securely fastened through sheathing to
framing. Apply covering immediately after sheathing is installed.

PART 2 - PRODUCTS

2.01 [GYPSUM SHEATHING BOARD]{.underline}

A. [Gypsum Sheathing Board with Water-Resistant Core]{.underline}:
Gypsum sheathing board consisting of noncombustible gypsum core
incorporating a water-resistant material, surfaced on face, back and
long edges with water-repellent paper; complying with ASTM C 79 and
requirements indicated below:

1\. Type: Regular (not Type X).

2\. Edge and End Configuration: Square.

3\. Thickness: 5/8 inch.

4\. Size: 4 feet by 8 feet.

B. [Products]{.underline}: Subject to compliance with requirements,
provide one of the following:

1\. Gypsum Sheathing Board with Water-Resistant Core, Regular Type:

\"Centex American Gypsum Sheathing\"; Centex American Gypsum Co.

\"Gyproc Gypsum Sheathing\"; Domtar Gypsum Co.

\"G-P Gypsum Sheathing\"; Georgia-Pacific Corp.

\"Gold Bond Gypsum Sheathing\"; Gold Bond Building Products Div.,
National Gypsum Co.

USG Gypsum Sheathing; United States Gypsum Co.

2.02 [ACCESSORY MATERIALS]{.underline}

A. [Air Infiltration Barrier]{.underline}: Refer to \"Exterior and
Interior Wall Types\" on drawings.

B. [Fasteners]{.underline}: Type S steel drill screws, 1\" long, with
corrosion-resistant finish in form of cadmium plating or proprietary
coating, and as follows:

1\. For attachment of sheathing to light gage steel framing of less than
0.033 of an inch in thickness, provide steel drill screws complying with
ASTM C 1002.

2\. For attachment of sheathing to steel framing from 0.033 to 0.112 of
an inch in thickness, provide steel drill screws complying with ASTM C
954.

C. [Sealant]{.underline}: Solvent-release-curing joint sealant
compatible with joint substrates formed by gypsum sheathing and other
related materials and complying with requirements of Division 7 Section
\"Joint Sealers.\"

PART 3 - EXECUTION

3.01 [INSTALLATION]{.underline}

A. [General]{.underline}: Except as otherwise indicated, comply with
manufacturer\'s instructions, GA 252, and the following for the
installation of gypsum sheathing.

1\. Cut boards at penetrations, edges and other obstructions of the
work; fit tight against abutting work, except provide 3/8 inch setback
where non-loadbearing work abuts structural elements at head and jambs.

2\. Coordinate installation of sheathing with installation of flashing
and joint sealers so that these combined materials are installed in the
sequence and manner which prevents exterior moisture from passing
through completed exterior wall assembly to the interior.

3\. Apply fasteners so that screw heads bear tightly against face of
gypsum sheathing boards but do not cut into face paper.

4\. Do not bridge building expansion joints with gypsum sheathing; cut
and space edges to match spacing of structural support elements.

B. [Vertical Installation]{.underline}: Install 4-feet wide gypsum
sheathing boards vertically with vertical edges centered over flanges of
steel studs. Abut ends and edges of each board with those of adjoining
boards. Screw-attach boards at perimeter and within field of board to
each steel stud as follows:

1\. Fasteners spaced approximately 8 inches o.c. and set back 3/8 inch
minimum from edges and ends of boards.

C. [Air Infiltration Barrier Application]{.underline}: Cover gypsum
board sheathing with air infiltration barrier as follows:

1\. Cut back air infiltration barrier 1/2 inch on each side of break in
supporting members at control joint locations.

2\. Apply asphalt-saturated organic felt horizontally with 2 inch
overlap and 6 inch endlap; fasten to sheathing with corrosion-resistant
staples.

3\. Apply air infiltration barrier over tops of parapets and down to
roof counterflashing with 4 inch lap.

END OF SECTION