General Specification Notes




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General Specification Notes:

References in blue are general indicators to the specifier.

References in red relate to fire-rated assemblies and/or code related issues, if not applicable, delete.



SECTION 06160 – SHEATHING
SHEETROCK Brand Gypsum Sheathing


Product Specification


PART 1 - GENERAL

1.01 SUMMARY

A.This Section includes the following:

1.Wall Sheathing.

2.Weather-Resistant Sheathing Barriers.

3.Sheathing Joint and Penetration Treatment.

B.Related Sections include the following:

1.Section 01352 – LEED Requirements.

2.Section 05400 – Cold-Formed Metal Framing.

3.Section 06100 – Rough Carpentry.

1.02 REFERENCES

A. American Society for Testing and Materials:

1. ASTM C 79: Standard Specification for Treated Core and Nontreated Core Gypsum Sheathing Board.

2. ASTM C 954: Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studs from 0.033 inch to 0.110 inch in Thickness.

3. ASTM C 1002: Standard Specification for Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs.

4. ASTM C 1280: Standard Specification for Application of Gypsum Sheathing.

5. ASTM C 1396: Standard Specification for Gypsum Board.

6. ASTM D 226: Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing.

7. ASTM E 84: Standard Test Method for Surface Burning Characteristics of Building Materials.

8. ASTM E 119: Test Method for Fire Tests of Building Construction and Materials.

9. ASTM E 1677: Standard Specification for an Air Retarder (AR) Material or System for Low-Rise Framed Building Walls.

B. Gypsum Association:

1. GA 253: Recommended Specification for the Application of Gypsum Sheathing.

1.03 SUBMITTALS

A. General: Submit in accordance with Section 01330

B. Product Data: Submit manufacturer’s current technical literature for product specified.

1.04 QUALITY ASSURANCE

A. Fire Resistance Rated Assembly Characteristics: Provide materials and construction identical to those tested in accordance to ASTM E 119 by an independent testing and inspection agency acceptable to authorities having jurisdiction.

1. Fire Resistance Ratings: Indicated by design designations from UL “Fire Resistance Directory.

1.05 DELIVERY, STORAGE, AND HANDLING

A. All materials shall be delivered in their original unopened packages and stored in an enclosed shelter providing protection from damage and exposure to the elements. WARNING: Store all SHEETROCK Brand Gypsum Sheathing flat. Panels are heavy and can fall over, causing serious injury or death. Do not move unless authorized.



PART 2 - PRODUCTS

2.01 WALL SHEATHING

A.Paper-Surfaced Gypsum Sheathing: ASTM C 79 or ASTM C 1396, gypsum sheathing; with water-resistant-treated core and with water-repellent paper bonded to core's face, back, and long edges.

1.Product: Subject to compliance with requirements, provide SHEETROCK Brand Gypsum Sheathing by United States Gypsum Company.

2.Type and Thickness: [Regular, 1/2 inch] [Type X, 5/8 inch] thick.

3.Edge and End Configuration: [V-shaped, tongue-and-groove long edges; square ends] [Square].

4.Size: [24 by 96 inches for horizontal] [48 by 96 inches for vertical] [48 by 108 for vertical] installation.



2.02 FASTENERS

          1. General: Provide fasteners of size and type indicated that comply with requirements specified in this Article for material and manufacture.

B.Nails: 11-gauge hot-dipped galvanized roofing nails [1-1/2 inch] [1-3/4 inch], 7/16 inch diameter head.

C.Wood Screws: DUROCK Brand Wood or USG Sheathing WF screws [1-1/4 inch] [1-5/8 inch] [2-1/4 inch] with corrosion-resistant coating.

D.Screws for Fastening Gypsum Sheathing to Cold-Formed Metal Framing: DUROCK Brand Steel or USG Sheathing SF steel drill screws [1-1/4 inch] [1-5/8 inch] [2-1/4 inch] with corrosion-resistant coating.

1.For steel framing less than 0.0329 inch thick, attach sheathing to comply with ASTM C 1002.

2.For steel framing from 0.033 to 0.112 inch thick, attach sheathing to comply with ASTM C 954.

2.03 WEATHER-RESISTANT SHEATHING BARRIERS


          1. Building Paper: ASTM D 226, Type 1 (No. 15 asphalt-saturated organic felt), unperforated.

E.Building Wrap: ASTM E 1677, Type I air retarder, with flame-spread and smoke-developed indexes of less that 25 and 450, respectively, when tested according to ASTM E 84, UV stabilized and acceptable to authorities having jurisdiction.

1.Products: Subject to compliance with requirements, provide Tyvek StuccoWrap by DuPont (E. I. du Pont de Nemours and Company).

F.Building-Wrap Tape: Pressure-sensitive plastic tape recommended by building-wrap manufacturer for sealing joints and penetrations in building wrap.

2.04 SHEATHING JOINT AND PENETRATION TREATMENT MATERIALS


          1. Sealant for Paper-Surfaced Gypsum Sheathing Board: Elastomeric, medium-modulus, neutral-curing silicone joint sealant compatible with joint substrates formed by gypsum sheathing and other materials, recommended by sheathing manufacturer for application indicated, and complying with requirements for elastomeric sealants specified in Section 07920 – Joint Sealants.

2.05 MISCELLANEOUS MATERIALS

          1. Flexible Flashing: Composite, self-adhesive, flashing product consisting of a pliable, rubberized-asphalt compound, bonded to a high-density, cross-laminated polyethylene film.

G.Primer for Flexible Flashing: Product recommended by manufacturer of flexible flashing for substrate.

PART 3 - EXECUTION

3.01 INSTALLATION, GENERAL

A.Do not use materials with defects that impair quality of sheathing or pieces that are too small to use with minimum number of joints or optimum joint arrangement.

B.Cut panels at penetrations, edges, and other obstructions of work; fit tightly against abutting construction, unless otherwise indicated.

C.Coordinate wall sheathing installation with flashing and joint-sealant installation so these materials are installed in sequence and manner that prevent exterior moisture from passing through completed assembly.

D.Do not bridge building expansion joints; cut and space edges of panels to match spacing of structural support elements.

3.03 GYPSUM SHEATHING INSTALLATION


          1. Comply with ASTM C 1280, GA-253 and manufacturer's written instructions.

1.Fasten sheathing to wood framing with [nails] [screws].

2.Fasten sheathing to cold-formed metal framing with screws.

3.Install boards with a 3/8-inch gap where non-load-bearing construction abuts structural elements.

4.Install boards with a 1/4-inch gap where they abut masonry or similar materials that might retain moisture, to prevent wicking.

E.Apply fasteners so heads bear tightly against face of sheathing boards but do not cut into facing.

F.Horizontal Installation: Install sheathing with V-grooved edge down and tongue edge up. Interlock tongue with groove to bring long edges in contact with edges of adjacent boards without forcing. Abut ends of boards over centers of studs, and stagger end joints of adjacent boards not less than one stud spacing. Attach boards at perimeter and within field of board to each steel stud.

1.Space fasteners approximately 8 inches o.c. and set back a minimum of 3/8 inch from edges and ends of boards.

2.For sheathing under stucco cladding, boards may be initially tacked in place with screws if overlying self-furring metal lath is screw-attached through sheathing to studs immediately after sheathing is installed.

G.Vertical Installation: Install board vertical edges centered over studs. Abut ends and edges of each board with those of adjacent boards. Attach boards at perimeter and within field of board to each stud.

1.Space fasteners approximately 8 inches o.c. and set back a minimum of 3/8 inch from edges and ends of boards.

2.For sheathing under stucco cladding, boards may be initially tacked in place with screws if overlying self-furring metal lath is screw-attached through sheathing to studs immediately after sheathing is installed.

3.04 WEATHER-RESISTANT SHEATHING BARRIER INSTALLATION


          1. General: Cover sheathing with weather-resistant sheathing paper as follows:

1.Cut back barrier 1/2 inch on each side of the break in supporting members at expansion- or control-joint locations.

2.Apply barrier to cover vertical flashing with a minimum 4-inch overlap, unless otherwise indicated.

H.Building Paper: Apply horizontally with a 2-inch overlap and a 6-inch end lap; fasten to sheathing with galvanized staples or roofing nails.

I.Building Wrap: Comply with manufacturer's written instructions.

1.Seal seams, edges, fasteners, and penetrations with tape.

2.Extend into jambs of openings and seal corners with tape.



3.05 SHEATHING JOINT-AND-PENETRATION TREATMENT

A. Apply elastomeric sealant to joints and fasteners. Seal all penetrations and openings.



3.06 FLEXIBLE FLASHING INSTALLATION

          1. Apply flexible flashing where indicated to comply with manufacturers written instructions.

1.Prime substrates as recommended by flashing manufacturer.

2.Lap seams and junctures with other materials at least 4 inches, except that at flashing flanges of other construction, laps need not exceed flange width.

3.Lap flashing over weather-resistant building paper at bottom and sides of openings.

4.Lap weather-resistant building paper over flashing at heads of openings.

5.After flashing has been applied, roll surfaces with a hard rubber or metal roller to ensure that flashing is completely adhered to substrates.

3.07 PROTECTION


          1. Paper-Surfaced Gypsum Sheathing: When applied to a structure, sheathing must not be left exposed to the elements for more that one month unless all gaps resulting from cuts, corners, joints and machine-end cuts of the sheathing are filled with a elastomeric sealant at the time of erection to protect the sheathing from water intrusion. This treatment will extend exposure time to six months. Protect sheathing by covering exposed exterior surface of sheathing with weather-resistant sheathing barrier securely fastened to framing. Apply covering immediately after sheathing is installed.

END OF SECTION 06160


SHEATHING

06160 -
USG Product Specification




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