09255-Gypsum Board Assemblies.DOC

Ellington Field ANGB

Houston, Texas

MASTERSPEC text, Copyright 1995, AIA, The American Institute of Architects

Paragraph number formatting method, Copyright 1988, ARCOM, Architectural Computer Services, Inc.

SECTION 09255

GYPSUM BOARD ASSEMBLIES

THIS SECTION USES THE TERM ARCHITECT. CHANGE THIS TERM AS NECESSARY TO MATCH THE ACTUAL TERM USED TO IDENTIFY THE DESIGN PROFESSIONAL AS DEFINED IN THE GENERAL AND SUPPLEMENTARY CONDITIONS.

PART 1 - GENERAL

1.1

RELATED DOCUMENTS

A.

Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

1.2

SUMMARY

A.

This Section includes the following:

ADJUST LIST BELOW TO SUIT PROJECT.

1.

Interior nonload-bearing steel framing members for gypsum board assemblies.

2.

Gypsum board assemblies attached to steel framing.

DELETE BELOW IF SPECIFIED IN DIVISION 9 SECTION "TILE."

3. Cementitious backer units installed with gypsum board assemblies (at shower stalls).

4. Water-resistant gypsum backing board installed with gypsum board assemblies (at wet walls at toilets).

5. Gypsum sheathing at exterior walls.

B.

Related Sections: The following Sections contain requirements that relate to this Section:

LIST BELOW ONLY PRODUCTS, CONSTRUCTION, AND EQUIPMENT FOR THIS PROJECT THAT THE READER MIGHT EXPECT TO FIND IN THIS SECTION BUT ARE SPECIFIED ELSEWHERE. VERIFY THAT THE SECTION TITLES LISTED BELOW FOR THIS PROJECT'S SPECIFICATIONS ARE CORRECT.

1.

Division 5 Section "Cold-Formed Metal Framing" for non-load and load-bearing steel framing (exterior walls) and load-bearing interior walls.

2.

Division 6 Section "Rough Carpentry" for wood framing and furring.

3. Division 7 Section "Firestopping" for firestopping systems and fire-resistance-rated joint sealants.

4. Division 9 Section “Gypsum Sheathing” for installations over steel framing.

5. Division 9 Section “Tile” for cementitious backer units installed as substrates for ceramic tile.

1.3

DEFINITIONS

A.

Gypsum Board Construction Terminology: Refer to ASTM C 11 and GA-505 for definitions of terms for gypsum board assemblies not defined in this Section or in other referenced standards.

1.4

ASSEMBLY PERFORMANCE REQUIREMENTS

DELETE BELOW IF STC-RATED ASSEMBLIES ARE NOT REQUIRED. IF RETAINING PARA, INDICATE STC RATINGS ON DRAWINGS.

A.

Sound Transmission Characteristics: For gypsum board assemblies with STC ratings, provide materials and construction identical to those of assemblies whose STC ratings were determined according to ASTM E 90 and classified according to ASTM E 413 by a qualified independent testing agency.

DELETE BELOW IF NO FIRE-RATED GYPSUM BOARD ASSEMBLIES.

B.

Fire Resistance: Provide gypsum board assemblies with fire-resistance ratings indicated.

1.5

SUBMITTALS

A.

General: Submit each item in this Article according to the Conditions of the Contract and Division 1 Specification Sections.

B.

Product Data: Provide for each type of product specified.

DELETE BELOW IF CONTROL- AND EXPANSION-JOINT LOCATIONS ARE INDICATED AND FULLY DETAILED ON DRAWINGS.

C. Shop Drawings: Furnish showing locations, fabrication, and installation of control and expansion joints including plans, elevations, sections, details of components, and attachments to other units of Work.

D. Product Certificates: Provide certificates signed by manufacturers of gypsum board assembly components certifying that their products comply with specified requirements.

NORMALLY DELETE BELOW. RETAIN ONLY IF MFRS SPECIFIED WILL PROVIDE PROJECT SPECIFIC CERTIFICATES.

1.6

QUALITY ASSURANCE

A.

Single-Source Responsibility for Steel Framing: Obtain steel framing members for gypsum board assemblies from a single manufacturer, unless otherwise indicated.

B.

Single-Source Responsibility for Panel Products: Obtain each type of gypsum board and other panel products from a single manufacturer.

C.

Single-Source Responsibility for Finishing Materials: Obtain finishing materials from either the same manufacturer that supplies gypsum board and other panel products or from a manufacturer acceptable to gypsum board manufacturer.

DELETE BELOW IF NO FIRE-RATED ASSEMBLIES.

D.

Fire-Test-Response Characteristics: Where fire-resistance-rated gypsum board assemblies are indicated, provide gypsum board assemblies that comply with the following requirements:

DELETE BELOW IF NOT APPLICABLE TO ASSEMBLIES INDICATED. INDICATE RATING, TESTING AGENCY, AND TESTING AGENCY'S DESIGN DESIGNATION ON DRAWINGS. SEE EDITING INSTRUCTION NO. 2 IN THE EVALUATIONS FOR MORE INFORMATION ABOUT REFERENCING PUBLICATIONS BELOW.

1.

Gypsum board assemblies indicated are identical to assemblies tested for fire resistance according to ASTM E 119 by an independent testing and inspecting agency acceptable to authorities having jurisdiction.

RETAIN BELOW IF PROPRIETARY TOP RUNNER THAT ISOLATES FIRE-RESISTANCE-RATED ASSEMBLIES FROM STRUCTURE ABOVE IS IN THIS SECTION. BELOW REFERS TO "FIRE TRAK" PRODUCED BY FIRE TRAK CORP.

2.

Deflection and Firestop Track: Top runner provided in fire-resistance-rated assemblies indicated is labeled and listed by UL, Warnock Hersey, or another testing and inspecting agency acceptable to authorities having jurisdiction.

DELETE BELOW IF NOT REQUIRED. IF RETAINING, INDICATE LOCATION, SIZE, AND OTHER DETAILS OF MOCKUPS ON DRAWINGS OR BY INSERTS.

1.7

DELIVERY, STORAGE, AND HANDLING

A.

Deliver materials in original packages, containers, or bundles bearing brand name and identification of manufacturer or supplier.

B.

Store materials inside under cover and keep them dry and protected against damage from weather, direct sunlight, surface contamination, corrosion, construction traffic, and other causes. Neatly stack gypsum panels flat to prevent sagging.

1.8

PROJECT CONDITIONS

A.

Environmental Conditions, General: Establish and maintain environmental conditions for applying and finishing gypsum board to comply with ASTM C 840 requirements or gypsum board manufacturer's recommendations, whichever are more stringent.

B.

Room Temperatures: For nonadhesive attachment of gypsum board to framing, maintain not less than 40 deg F. For adhesive attachment and finishing of gypsum board, maintain not less than 50 deg F for 48 hours before application and continuously after until dry. Do not exceed 95 deg F when using temporary heat sources.

C.

Ventilation: Ventilate building spaces as required to dry joint treatment materials. Avoid drafts during hot, dry weather to prevent finishing materials from drying too rapidly.

PART 2 - PRODUCTS

2.1

MANUFACTURERS

A.

Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated in the Work include, but are not limited to, the following:

RETAIN ABOVE FOR NONPROPRIETARY OR BELOW FOR SEMIPROPRIETARY SPECIFICATION. REFER TO DIVISION 1 SECTION "MATERIALS AND EQUIPMENT."

SEE EDITING INSTRUCTION NO. 1 IN THE EVALUATIONS FOR CAUTIONS ABOUT NAMING PRODUCTS AND MFRS.

1.

Steel Framing and Furring:

a.

Clark Steel Framing, Inc.

b.

Consolidated Systems, Inc.

c.

Dale Industries, Inc.

d.

Dietrich Industries, Inc.

e.

Marino/Ware (formerly Marino Industries Corp.).

f.

National Gypsum Co.; Gold Bond Building Products Division.

g.

Unimast, Inc.

2.

Grid Suspension Assemblies:

a.

Armstrong World Industries, Inc.

b.

Chicago Metallic Corp.

c.

USG Interiors, Inc.

d.

Worthington Steel Company (formerly National Rolling Mills).

3.

Gypsum Board and Related Products:

MFRS LISTED BELOW MARKET PRODUCTS NATIONALLY. INSERT NAMES OF OTHER GYPSUM MFRS IF THEIR PRODUCTS ARE AVAILABLE IN PROJECT AREA AND COMPLY WITH SPECIFIED REQUIREMENTS. SEE EVALUATIONS FOR LISTING OF MEMBERS OF THE GYPSUM ASSOCIATION (GA). NOT ALL MFRS OFFER A FULL RANGE OF RELATED PRODUCTS.

a.

Domtar Gypsum.

b.

Georgia-Pacific Corp.

c.

National Gypsum Co.; Gold Bond Building Products Division.

d.

United States Gypsum Co.

DELETE BOTH PARAS AND LIST OF PRODUCTS BELOW IF NO PROPRIETARY WALLBOARD PRODUCTS ARE SPECIFIED. FIRE-RESISTANCE RATINGS FOR ASSEMBLIES USING PROPRIETARY GYPSUM BOARD PANELS ONLY APPLY TO ASSEMBLIES IDENTICAL IN MATERIALS AND CONSTRUCTION TO THOSE TESTED. IF MORE THAN ONE PRODUCT IS ACCEPTABLE FOR USE IN FIRE-RESISTANCE-RATED ASSEMBLIES, INDICATE ON DRAWINGS THAT ENTIRE TESTED ASSEMBLY INCORPORATING THE PARTICULAR PRODUCT OPTION SELECTED IS REQUIRED.

CERTAIN PROPERTIES OF PRODUCTS MAY BE SPECIFIED IN SUBSEQUENT ARTICLES BY SELECTING A "DEFAULT" REQUIREMENT THAT APPLIES UNLESS EXCEPTIONS ARE INDICATED HERE OR ON DRAWINGS. THESE DEFAULT REQUIREMENTS ARE QUALIFIED BY THE PHRASE "UNLESS OTHERWISE INDICATED." IF NO EXCEPTIONS ARE ALLOWED OR KNOWN TO EXIST, DELETE THIS PHRASE. IF ALL INDICATIONS ARE ON DRAWINGS, RETAIN ONLY THE "AS INDICATED" REQUIREMENT.

2.2

STEEL FRAMING COMPONENTS FOR SUSPENDED AND FURRED CEILINGS

DELETE ARTICLE IF NO SUSPENDED OR FURRED CEILINGS.

A.

General: Provide components complying with ASTM C 754 for conditions indicated.

DELETE ANY COMPONENTS BELOW IF NOT REQUIRED.

DELETE BELOW IF NO CONCRETE OR IF HANGERS ARE EMBEDDED DIRECTLY IN CONCRETE. VERIFY SAFETY FACTOR; REVISE AS REQUIRED OR INSERT SPECIFIC LOAD REQUIREMENTS AND NAMES OF ACCEPTABLE PRODUCTS.

REVISE THICKNESS BELOW TO COMPLY WITH REQUIREMENTS OF SPECIFIC FIRE-RESISTANCE-RATED ASSEMBLIES REQUIRED.

B.

Wire Ties: ASTM A 641, Class 1 zinc coating, soft temper, 0.062 inch thick.

DELETE WIRE HANGER PARA BELOW IF HANGER RODS OR FLAT HANGERS ARE REQUIRED BY LOCAL CODE OR LOADING.

C.

Wire Hangers: ASTM A 641, Class 1, zinc coating, soft temper, 0.162-inch diameter.

D.

Hanger Rods: Mild steel and zinc coated or protected with rust-inhibitive paint.

E.

Flat Hangers: Mild steel and zinc coated or protected with rust-inhibitive paint.

RETAIN BELOW FOR EXCEPTIONAL UPLIFT RESISTANCE. IF MORE THAN ONE HANGER TYPE IS REQUIRED, INDICATE LOCATIONS ON DRAWINGS.

F.

Angle-Type Hangers: Angles with legs not less than 7/8 inch wide, formed from 0.0635-inch-thick galvanized steel sheet complying with ASTM A 653, G 90 coating designation, with bolted connections and 5/16-inch diameter bolts.

DELETE BELOW IF SUSPENSION SYSTEM IS LIMITED TO GRID SUSPENSION SYSTEM.

G.

Channels: Cold-rolled steel, 0.0598-inch minimum thickness of base (uncoated) metal and 7/16-inch-wide flanges, and as follows:

DELETE ABOVE OR BELOW UNLESS BOTH ARE REQUIRED, LOCATIONS OF EACH ARE INDICATED ON DRAWINGS, AND QUALIFYING PHRASE FOR EXCEPTION IS CHANGED TO "WHERE INDICATED."

1.

Carrying Channels: 1-1/2 inches deep, 475 lb/1000 feet, unless otherwise indicated.

2.

Furring Channels: 3/4 inch deep, 300 lb/1000 feet, unless otherwise indicated.

RETAIN ABOVE WITH OR WITHOUT BELOW UNLESS BELOW BECOMES DEFAULT REQUIREMENT AND "WHERE INDICATED" IS DELETED FROM END OF SENTENCE. IF ABOVE IS RETAINED WITH BELOW, INDICATE LOCATION OF ITEMS WHERE GALVANIZED FINISH IS REQUIRED.

3.

Finish: ASTM A 653, G 60 hot-dip galvanized coating for framing for exterior soffits and where indicated.

H.

Steel Studs for Furring Channels: ASTM C 645, with flange edges of studs bent back 90 degrees and doubled over to form 3/16-inch-wide minimum lip (return), and complying with the following requirements for minimum thickness of base (uncoated) metal and for depth:

1.

Thickness: 0.0179 inch, unless otherwise indicated.

2.

Depth: As indicated on construction drawings.

3.

Protective Coating: ASTM A 653, G 40 hot-dip galvanized coating.

I.

Steel Rigid Furring Channels: ASTM C 645, hat shaped, depth of 7/8 inch, and minimum thickness of base (uncoated) metal as follows:

RETAIN ONE THICKNESS REQUIREMENT BELOW.

1.

Thickness: 0.0179 inch, unless otherwise indicated.

RETAIN BELOW IF GALVANIZED COATING IS ONLY REQUIRED AT EXTERIOR AND BUILDING PERIMETER LOCATIONS.

2.

Protective Coating: ASTM A 653, G 40 hot-dip galvanized coating for framing for exterior soffits and ceiling suspension members in areas within 10 feet of exterior walls.

REFER TO MFRS' LITERATURE FOR LIMITATIONS ON USING THEIR RESILIENT FURRING CHANNELS.

RETAIN BELOW FOR INTERIOR CEILINGS ONLY.

J.

Grid Suspension System for Interior Ceilings: ASTM C 645, manufacturer's standard direct-hung grid suspension system composed of main beams and cross-furring members that interlock to form a modular supporting network.

2.3

STEEL FRAMING FOR WALLS AND PARTITIONS

DELETE ARTICLE IF NO STEEL FRAMING FOR WALLS AND PARTITIONS. BEFORE SELECTING THICKNESSES AND DEPTHS OF FRAMING MEMBERS, CHECK MFRS' DATA FOR HEIGHT AND DEFLECTION REQUIREMENTS.

A.

General: Provide steel framing members complying with the following requirements:

1.

Protective Coating: ASTM A 653, G 40 hot-dip galvanized coating.

B.

Steel Studs and Runners: ASTM C 645, with flange edges of studs bent back 90 degrees and doubled over to form 3/16-inch-wide minimum lip (return), and complying with the following requirements for minimum thickness of base (uncoated) metal and for depth:

1.

Thickness: 0.0179 inch, unless otherwise indicated.

GA-219 RECOMMENDS 0.0329-INCH- (0.84-mm-) THICK FRAMING FOR BOTH STANDARD-WEIGHT AND HEAVY DOORS. GA-219 ALSO INCLUDES AN ALTERNATE DETAIL FOR 0.0179-INCH- (0.45-mm-) THICK FRAMING WITH 2 NESTED STUDS AT EACH JAMB FOR SLIP-ON DOOR FRAMES SUPPORTING STANDARD-WEIGHT DOORS.

a. For head runner, sill runner, jamb, and cripple studs at door and other openings.

DELETE BELOW IF NO CEMENTITIOUS BACKER UNITS.

2.

In locations to receive cementitious backer units.

a.

Thickness: 0.329 inch.

RETAIN OR REVISE DEFAULT REQUIREMENT FROM CHOICES ABOVE AND BELOW. DELETE, RETAIN, OR REVISE EXCEPTIONS OR RETAIN "AS INDICATED" IF BOTH DEFAULT AND EXCEPTIONS ARE DELETED.

3.

Depth: 3-5/8 inches, unless otherwise indicated.

C.

Deflection Track: Manufacturer's standard top runner designed to prevent cracking of gypsum board applied to interior partitions resulting from deflection of the structure above fabricated from steel sheet complying with ASTM A 653 or ASTM A 568. Thickness as indicated for studs, and width to accommodated depth of studs, and of the following configuration:

RETAIN 1 OF 3 SUBPARAS BELOW. BOTH CONFIGURATIONS ARE DESIGNED TO ALLOW ATTACHMENT OF STUDS TO TRACK.

ABOVE IS AVAILABLE FROM METAL-LITE, INC. THIS PRODUCT HAS BEEN TESTED IN FIRE-RESISTANCE ASSEMBLIES WITH "MONOKOTE MK-6" SPRAYED-ON CEMENTITIOUS FIREPROOFING PRODUCED BY W.R. GRACE & CO. INSTALLED IN THE TRACK. IF FIRE-RESISTANCE-RATED ASSEMBLIES ARE REQUIRED, DETAIL ASSEMBLIES ON DRAWINGS AND CORRELATE WITH REQUIREMENTS OF DIVISION 7 SECTION "SPRAYED-ON FIREPROOFING."

1.

Top runner with 2-1/2-inch-deep flanges that either have V-shaped offsets that compress when pressure is applied from construction above or have slots 1 inch o.c. that allow fasteners attached to studs through the slots to accommodate structural movement by slipping.

PARA AND SUBPARAS BELOW SPECIFY PROPRIETARY PRODUCT FOR ISOLATING PARTITION FRAMING FROM STRUCTURE ABOVE IN SPECIFIC FIRE-RESISTANCE-RATED ASSEMBLIES. THIS PRODUCT IS ALSO USEFUL FOR APPLICATIONS WHERE SOUND CONTROL IS IMPORTANT. DELETE BELOW IF NO RATED ASSEMBLIES OR EDIT TEXT TO SUIT PROJECT IF PRODUCT IS USED FOR SOUND CONTROL APPLICATIONS ONLY. DETAIL BRACING REQUIREMENTS TO PREVENT LATERAL MOVEMENT.

D.

Deflection and Firestop Track: Top runner designed to allow partition heads to expand and contract with movement of structure above while maintaining continuity of the assembly. Comply with requirements of ASTM C 645 except configuration, of thickness indicated for studs and width to accommodate depth of studs indicated with flanges offset at midpoint to accommodate gypsum board thickness.

RETAIN 1 OF 3 OFFSET CONFIGURATION REQUIREMENTS BELOW.

1.

Available Product: Subject to compliance with requirements, a product that may be incorporated in the Work includes, but is not limited to, "Fire Trak" manufactured by Fire Trak Corp.

E.

Steel Rigid Furring Channels: ASTM C 645, hat shaped, depth and minimum thickness of base (uncoated) metal as follows:

1.

Thickness: 0.0179 inch, unless otherwise indicated.

RETAIN ONE REQUIREMENT ABOVE AND BELOW.

2.

Depth: 7/8 inch.

RETAIN BELOW FOR ATTACHING FURRING CHANNELS TO INTERIOR MASONRY WALLS.

F.

Furring Brackets: Serrated-arm type, adjustable, fabricated from corrosion-resistant steel sheet complying with ASTM C 645, minimum thickness of base (uncoated) metal of 0.0329 inch, designed for screw attachment to steel studs and steel rigid furring channels used for furring.

REFER TO MFRS' LITERATURE FOR LIMITATIONS ON USING THEIR RESILIENT FURRING CHANNELS.

RETAIN BELOW IF CHANNEL BRIDGING IS DETAILED ON DRAWINGS.

G.

Steel Channel Bridging: Cold-rolled steel, 0.0598-inch minimum thickness of base (uncoated) metal and 7/16-inch-wide flanges, 1-1/2 inches deep, 475 lb/1000 feet, unless otherwise indicated.

RETAIN BELOW IF STEEL SHEET BLOCKING OR BRACING IS REQUIRED. INDICATE LOCATIONS, LENGTHS, AND WIDTHS ON DRAWINGS OR ADD A DETAILED DESCRIPTION TO TEXT.

H.

Steel Flat Strap and Backing Plate: Steel sheet for blocking and bracing complying with ASTM A 653 or ASTM A 568, length and width as indicated, and with a minimum base metal (uncoated) thickness as follows:

1.

Thickness: 0.0179 inch, unless otherwise indicated.

I.

Fasteners for Metal Framing: Provide fasteners of type, material, size, corrosion resistance, holding power, and other properties required to fasten steel framing and furring members securely to substrates involved; complying with the recommendations of gypsum board manufacturers for applications indicated.

2.4

GYPSUM BOARD PRODUCTS

A.

General: Provide gypsum board of types indicated in maximum lengths available that will minimize end-to-end butt joints in each area indicated to receive gypsum board application.

1.

Widths: Provide gypsum board in widths of 48 inches.

B. Gypsum Sheathing: Per materials conforming with requirements of ASTM C79.

1. Type: Regular.

2. Edges: V-shaped, tongue and grooved on long edges.

3. Size: 2(-0( x 8(-0(.

4. Thickness: ½ inch.

C. Gypsum Wallboard: ASTM C 36 and as follows:

DELETE TYPES BELOW IF NOT REQUIRED. INDICATE ON DRAWINGS IF FIRE-RESISTANT TYPES OCCUR. SEE EVALUATIONS.

1.

Type: Regular for vertical surfaces, unless otherwise indicated.

2.

Type: Type X where required for fire-resistance-rated assemblies.

3.

Type: Sag-resistant type for ceiling surfaces.

4.

Edges: Tapered and featured (rounded or beveled) for prefilling.

5.

Thickness: 5/8 inch unless otherwise indicated.

DELETE BELOW IF NO MULTILAYER APPLICATIONS. SEE EVALUATIONS.

BELOW IS SUITABLE ONLY FOR SOFFITS INDIRECTLY EXPOSED TO WEATHER. SEE MFRS' LITERATURE FOR LIMITATIONS.

DELETE BELOW IF CEMENTITIOUS BACKER UNITS ARE EXCLUSIVELY SPECIFIED AS BASE FOR TILE.

D.

Water-Resistant Gypsum Backing Board: ASTM C 630 and as follows:

1.

Type: Regular, unless otherwise indicated.

RETAIN OR REVISE DEFAULT REQUIREMENT BELOW. DELETE, RETAIN, OR REVISE EXCEPTIONS OR RETAIN "AS INDICATED" IF BOTH DEFAULT AND EXCEPTIONS ARE DELETED.

2.

Thickness: 5/8 inch, unless otherwise indicated.

BELOW REFERS TO "DENS-SHIELD TILE BACKER" BY GEORGIA-PACIFIC.

2.5

CEMENTITIOUS BACKER UNITS

DELETE ARTICLE IF CEMENTITIOUS BACKER UNITS ARE NOT REQUIRED FOR PROJECT OR IF SPECIFIED IN ANOTHER SECTION.

A.

Provide cementitious backer units complying with ANSI A118.9, of thickness and width indicated below, and in maximum lengths available to minimize end-to-end butt joints.

CORRELATE THICKNESS BELOW WITH PRODUCTS RETAINED. 7/16-INCH (11.1-mm) THICKNESS IS AVAILABLE IN "THE ORIGINAL WONDERBOARD" PRODUCED BY CUSTOM BUILDING PRODUCTS. 1/2-INCH (12.7-mm) THICKNESS IS AVAILABLE IN ALL PRODUCTS LISTED EXCEPT "THE ORIGINAL WONDERBOARD." 5/8-INCH (15.9-mm) THICKNESS IS AVAILABLE FROM UNITED STATES GYPSUM CO.

1.

Thickness: 5/8 inch.

2.

Width: 48 inches.

B.

Available Products: Subject to compliance with requirements, cementitious backer units that may be incorporated in the Work include, but are not limited to, the following:

RETAIN ABOVE FOR NONPROPRIETARY OR BELOW FOR SEMIPROPRIETARY SPECIFICATION. REFER TO DIVISION 1 SECTION "MATERIALS AND EQUIPMENT."

SEE EDITING INSTRUCTION NO. 1 IN THE EVALUATIONS FOR CAUTIONS ABOUT NAMING PRODUCTS AND MFRS.

1.

The Original Wonderboard; Custom Building Products.

2.

Wonderboard Multi+Board; Custom Building Products.

3.

DomCrete Cementitious Tile-Backer Board; Domtar Gypsum.

4.

Util-A-Crete Concrete Backer Board; FinPan, Inc.

5.

DUROCK Cement Board; United States Gypsum Co.

2.6

TRIM ACCESSORIES

A.

Accessories for Interior Installation: Cornerbead, edge trim, and control joints complying with ASTM C 1047 and requirements indicated below:

1.

Material: Formed metal or plastic, with steel sheet zinc coated by hot-dip or electrolytic process, or steel sheet coated with aluminum or rolled zinc.

2.

Shapes indicated below by reference to Fig. 1 designations in ASTM C 1047:

RETAIN SHAPES REQUIRED FROM CHOICES BELOW.

a.

Cornerbead on outside corners, unless otherwise indicated.

b.

LC-bead with both face and back flanges; face flange formed to receive joint compound. Use LC-beads for edge trim, unless otherwise indicated.

c.

L-bead with face flange only; face flange formed to receive joint compound. Use L-bead where indicated.

d.

One-piece control joint formed with V-shaped slot and removable strip covering slot opening.

DELETE BELOW IF NO CURVED EDGES.

2.7

JOINT TREATMENT MATERIALS

A.

General: Provide joint treatment materials complying with ASTM C 475 and the recommendations of both the manufacturers of sheet products and of joint treatment materials for each application indicated.

PAPER TAPES WITH PRESSURE-SENSITIVE ADHESIVE BACKING ARE AVAILABLE. IF ADDED TO TEXT, VERIFY ACCEPTABILITY WITH MFRS LISTED. GLASS-FIBER-MESH JOINT TAPES, WITH OR WITHOUT PRESSURE-SENSITIVE ADHESIVE BACKING, ARE ALSO AVAILABLE BUT ARE ONLY APPROVED BY MFRS FOR USE WITH SELECTED SETTING-TYPE JOINT COMPOUNDS.

B.

Joint Tape for Gypsum Board: Paper reinforcing tape, unless otherwise indicated.

DELETE BELOW IF NOT APPLICABLE.

RETAIN BELOW IF CEMENTITIOUS BACKER UNITS ARE SPECIFIED IN THIS SECTION.

C.

Joint Tape for Cementitious Backer Units: As recommended by cementitious backer unit manufacturer.

JOINT COMPOUNDS LISTED BELOW ARE USUAL RANGE OF PRODUCT CHOICES AVAILABLE. BEFORE EDITING BELOW, EDIT PART 3 "FINISHING GYPSUM BOARD ASSEMBLIES" ARTICLE TO DETERMINE WHICH COMPOUND PRODUCTS TO RETAIN. SEE EVALUATIONS FOR CONSIDERATIONS INVOLVED IN SELECTING JOINT COMPOUNDS.

D.

Setting-Type Joint Compounds for Gypsum Board: Factory-packaged, job-mixed, chemical-hardening powder products formulated for uses indicated.

RETAIN APPLICABLE REQUIREMENTS BELOW. SETTING-TYPE JOINT COMPOUNDS OFFER ADJUSTABLE SETTING AND WORKING TIMES. THEY ARE USED WHERE FAST ONE-DAY FINISHING IS REQUIRED OR WHERE RAPID DRYING CONDITIONS EXIST THAT WOULD CAUSE DRYING-TYPE JOINT COMPOUNDS TO SHRINK EXCESSIVELY AND LOSE SURFACE STRENGTH.

1.

Where setting-type joint compounds are indicated as a taping compound only or for taping and filling only, use formulation that is compatible with other joint compounds applied over it.

2.

For prefilling gypsum board joints, use formulation recommended by gypsum board manufacturer.

3.

For filling joints and treating fasteners of water-resistant gypsum backing board behind base for ceramic tile, use formulation recommended by gypsum board manufacturer.

4.

For topping compound, use sandable formulation.

E.

Drying-Type Joint Compounds for Gypsum Board: Factory-packaged vinyl-based products complying with the following requirements for formulation and intended use.

CORRELATE FORMULATION AND COMPOUND TYPES WITH FINISHING REQUIREMENTS IN PART 3. ACCORDING TO MFRS, READY-MIXED FORMULATIONS MAKE UP MAJORITY OF SALES.

1.

Ready-Mixed Formulation: Factory-mixed product.

a.

Taping compound formulated for embedding tape and for first coat over fasteners and face flanges of trim accessories.

b.

Topping compound formulated for fill (second) and finish (third) coats.

c.

All-purpose compound formulated for both taping and topping compounds.

DELETE BELOW IF CEMENTITIOUS BACKER UNITS ARE NOT SPECIFIED IN THIS SECTION OR IF FINISHING OF CEMENTITIOUS BACKER UNITS INCLUDED IN THIS SECTION IS WORK OF DIVISION 9 SECTION "TILE."

F.

Joint Compound for Cementitious Backer Units: Material recommended by cementitious backer unit manufacturer.

2.8

ACOUSTICAL SEALANT

A.

Acoustical Sealant for Exposed and Concealed Joints: Manufacturer's standard non-sag, paintable, nonstaining latex sealant complying with ASTM C 834, and ASTM E 90 for reducing airborne sound transmission through perimeter joints and openings in building construction.

UNITED STATES GYPSUM CO. ADVERTISES THAT ITS ACOUSTICAL SEALANT HAS FLAME-SPREAD AND SMOKE-DEVELOPED RATINGS OF LESS THAN 25 PER ASTM E 84. INSERT THIS REQUIREMENT ABOVE IF REQUIRED FOR SEALANT BY AUTHORITIES HAVING JURISDICTION.

B.

Acoustical Sealant for Concealed Joints: Manufacturer's standard nondrying, nonhardening, nonskinning, nonstaining, gunnable, synthetic-rubber sealant recommended for sealing interior concealed joints to reduce transmission of airborne sound.

C.

Available Products: Subject to compliance with requirements, acoustical sealants that may be incorporated in the Work include, but are not limited to, the following:

RETAIN ABOVE FOR NONPROPRIETARY OR BELOW FOR SEMIPROPRIETARY SPECIFICATION. REFER TO DIVISION 1 SECTION "MATERIALS AND EQUIPMENT."

SEE EDITING INSTRUCTION NO. 1 IN THE EVALUATIONS FOR CAUTIONS ABOUT NAMING PRODUCTS AND MFRS.

1.

Acoustical Sealant for Exposed and Concealed Joints:

a.

PL Acoustical Sealant; ChemRex, Inc.; Contech Brands.

b.

AC-20 FTR Acoustical and Insulation Sealant; Pecora Corp.

c.

SHEETROCK Acoustical Sealant; United States Gypsum Co.

2.

Acoustical Sealant for Concealed Joints:

a.

BA-98; Pecora Corp.

b.

Tremco Acoustical Sealant; Tremco, Inc.

2.9

MISCELLANEOUS MATERIALS

A.

General: Provide auxiliary materials for gypsum board construction that comply with referenced standards and recommendations of gypsum board manufacturer.

1. Provide rails, staples, screws, bolts, nuts, washers and devices as indicated and as recommended by applicable standards, complying with applicable Federal Specifications.

2. Nails, Wire Brads and Staples: Per FS FF-N-105.

3. Wood Screws: Per ANSI B18.6.1.

4. Lag Bolts: Per ANSI B18.2.1.

5. Bolts: Steel bolts per ASTM A307; Grade A with ASTM A563 hex nuts and where indicated, flat washers.

6. Power Driven Fasteners: Per National Evaluation Report NER-272.

DELETE MATERIALS NOT APPLICABLE TO PROJECT.

B.

Spot Grout: ASTM C 475, setting-type joint compound recommended for spot-grouting hollow metal door frames.

C.

Fastening Adhesive for Wood: ASTM C 557.

D.

Fastening Adhesive for Metal: Special adhesive recommended for laminating gypsum panels to steel framing.

E.

Steel drill screws complying with ASTM C 1002 for the following applications:

DELETE APPLICATIONS BELOW NOT REQUIRED FOR PROJECT.

1.

Fastening gypsum board to steel members less than 0.033 inch thick.

2.

Fastening gypsum board to wood members.

3.

Fastening gypsum board to gypsum board.

RETAIN BELOW IF FRAMING MEMBERS OF THICKNESSES INDICATED ARE SPECIFIED IN THIS SECTION OR LOAD-BEARING STEEL FRAMING IS SPECIFIED IN DIVISION 5 SECTIONS.

F.

Steel drill screws complying with ASTM C 954 for fastening gypsum board to steel members from 0.033 to 0.112 inch thick.

RETAIN BELOW IF CEMENTITIOUS BACKER UNITS ARE SPECIFIED IN THIS SECTION.

G.

Steel drill screws of size and type recommended by unit manufacturer for fastening cementitious backer units.

H.

Sound-Attenuation Blankets: Unfaced mineral-fiber blanket insulation produced by combining fibers manufactured from glass, slag wool, or rock wool with thermosetting resins to comply with ASTM C 665 for Type I (blankets without membrane facing).

RETAIN 1 OF 3 BELOW. IF USED IN FIRE-RESISTANCE-RATED ASSEMBLIES, VERIFY THAT MINERAL-FIBER TYPES RETAINED CORRESPOND WITH REQUIREMENTS OF TESTED ASSEMBLIES.

PART 3 - EXECUTION

3.1

EXAMINATION

REVISE BELOW TO SUIT PROJECT CONDITIONS AND CONSTRUCTION.

A.

Examine substrates to which gypsum board assemblies attach or abut, installed hollow metal frames, cast-in-anchors, and structural framing, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of assemblies specified in this Section. Do not proceed with installation until unsatisfactory conditions have been corrected.

3.2

PREPARATION

DELETE ARTICLE IF NO STEEL FRAMING FOR CEILINGS OR PARTITIONS. DELETE PARA AND SUBPARA BELOW IF POSTINSTALLED ANCHORS ARE SPECIFIED EXCLUSIVELY FOR INSTALLING CEILING SYSTEMS.

A.

Ceiling Anchorages: Coordinate installation of ceiling suspension systems with installation of overhead structural assemblies to ensure that inserts and other provisions for anchorages to building structure have been installed to receive ceiling hangers that will develop their full strength and at spacing required to support ceilings.

DELETE BELOW IF ANCHORAGE DEVICES ARE NOT USED OR IF SPECIFIED IN OTHER SECTIONS.

3.3

INSTALLING STEEL FRAMING, GENERAL

ASTM C 840 INCLUDES INSTALLATION REQUIREMENTS THAT ARE NOT INCLUDED IN ASTM C 754.

A.

Steel Framing Installation Standard: Install steel framing to comply with ASTM C 754 and with ASTM C 840 requirements that apply to framing installation.

B.

Supplementary Framing, Blocking, and Bracing: Install at terminations in gypsum board assemblies to support fixtures, equipment services, heavy trim, grab bars, toilet accessories, furnishings, or similar construction. Comply with details indicated and with recommendations of gypsum board manufacturer or, if none available, with United States Gypsum Co.'s "Gypsum Construction Handbook."

INDICATE ISOLATION DETAILS ON DRAWINGS OR INSERT DETAILED DESCRIPTION HERE.

C.

Structural Movement: Isolate steel framing from building structure at locations indicated to prevent transfer of loading imposed by structural movement. Comply with details shown on Drawings.

BELOW ARE EXAMPLES ONLY. RETAIN OR REVISE TO SUIT PROJECT.

1.

Where building structure abuts ceiling perimeter or penetrates ceiling.

2.

Where partition framing and wall furring abut structure, except at floor.

RETAIN ABOVE OR BELOW. RETAIN ABOVE IF DETAILS ARE PROVIDED ON DRAWINGS OR REVISE TO DESCRIBE CONNECTION REQUIRED. RETAIN BELOW IF DEFLECTION TRACK IS SPECIFIED IN PART 2. VERIFY ISOLATION PROVISIONS FOR FIRE-RESISTANCE-RATED CONSTRUCTION COMPLY WITH REQUIREMENTS OF RATED ASSEMBLIES.

a.

Install deflection track top runner to attain lateral support and avoid axial loading.

RETAIN BELOW IF PROPRIETARY FIRE-RESISTANCE-RATED DEFLECTION AND FIRESTOP TRACK IS SPECIFIED IN PART 2. INDICATE LOCATIONS OF ASSEMBLIES INCORPORATING PRODUCT ON DRAWINGS.

b.

Install deflection and firestop track top runner at fire-resistance-rated assemblies where indicated.

1) Attach jamb studs at openings to tracks using manufacturer's standard stud clip.

INCLUDE DETAILS ON DRAWINGS SHOWING CONTROL- AND EXPANSION-JOINT CONSTRUCTION AND LOCATIONS FOR BOTH FIRE-RESISTANCE-RATED AND NONRATED ASSEMBLIES.

D.

Joints: Do not bridge building control and expansion joints with steel framing or furring members. Independently frame both sides of joints with framing or furring members as indicated.

3.4

INSTALLING STEEL FRAMING FOR SUSPENDED CEILINGS

DELETE PARA BELOW IF NO WOOD FRAMING (CEILING JOISTS/BEAMS, STUDS, ETC.).

A.

General: Suspend ceiling hangers from building structural members and as follows:

1.

Install hangers plumb and free from contact with insulation or other objects within ceiling plenum that are not part of supporting structural or ceiling suspension system. Splay hangers only where required to miss obstructions and offset resulting horizontal forces by bracing, countersplaying, or other equally effective means.

2.

Where width of ducts and other construction within ceiling plenum produces hanger spacings that interfere with the location of hangers required to support standard suspension system members, install supplemental suspension members and hangers in form of trapezes or equivalent devices. Size supplemental suspension members and hangers to support ceiling loads within performance limits established by referenced standards.

3.

Secure wire hangers by looping and wire-tying, either directly to structures or to inserts, eyescrews, or other devices and fasteners that are secure and appropriate for substrate, and in a manner that will not cause them to deteriorate or otherwise fail.

4.

Secure flat, angle, and rod hangers to structure, including intermediate framing members, by attaching to inserts, eyescrews, or other devices and fasteners that are secure and appropriate for structure as well as for type of hanger involved, and in a manner that will not cause them to deteriorate or otherwise fail.

5.

Do not attach hangers to steel roof deck. Attach hangers to structural members.

6.

Do not connect or suspend steel framing from ducts, pipes, or conduit.

REVISE BELOW TO INCLUDE SPECIFIC PROVISIONS FOR SEISMIC BRACING TO SUIT PROJECT.

B.

Sway-brace suspended steel framing with hangers used for support.

C.

Install suspended steel framing components in sizes and at spacings indicated, but not less than that required by the referenced steel framing installation standard.

BELOW IS AN EXAMPLE OF A DEFAULT REQUIREMENT. DELETE IF SPACING IS INDICATED ON DRAWINGS OR REVISE IF OTHER SPACING IS REQUIRED TO SUIT PROJECT.

1.

Wire Hangers: 48 inches o.c.

2.

Carrying Channels (Main Runners): 48 inches o.c.

3.

Furring Channels (Furring Members): 24 inches o.c.

TOLERANCES BELOW ARE BASED ON THOSE SPECIFIED IN ASTM C 636 FOR ACOUSTICAL CEILINGS. NO TOLERANCES CURRENTLY EXIST IN GYPSUM BOARD STANDARDS. REVISE IF OTHER TOLERANCES ARE REQUIRED.

D.

Install steel framing components for suspended ceilings so that cross-furring or grid suspension members are level to within 1/8 inch in 12 feet tolerances as measured both lengthwise on each member and transversely between parallel members.

FURRING MEMBERS MUST BE WIRE-TIED TO SUPPORTS IN MOST FIRE-RESISTANCE-RATED ASSEMBLIES. VERIFY REQUIREMENTS OF APPLICABLE ASSEMBLIES AND REVISE PARA BELOW TO SUIT PROJECT.

E.

Wire-tie or clip furring members to main runners and to other structural supports as indicated.

DELETE BELOW IF GRID SUSPENSION SYSTEM IS NOT INCLUDED IN PART 2 OR ALLOWED.

F.

Grid Suspension System: 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.

SHOW FRAMING DETAILS FOR BELOW ON DRAWINGS.

3.5

INSTALLING STEEL FRAMING FOR WALLS AND PARTITIONS

A.

Install runners (tracks) at floors, ceilings, and structural walls and columns where gypsum board stud assemblies abut other construction. Where studs are installed directly against exterior walls, install asphalt felt strips or foam gaskets between studs and wall.

BELOW IS BASED ON RECOMMENDATION IN GA-216 FOR FRAMING. ASTM C 840 REQUIRES ONLY THAT FRAMING AND SUBSTRATES BE INSTALLED SO THAT AFTER GYPSUM BOARD HAS BEEN INSTALLED, THE FINISHED SURFACE WILL BE IN AN EVEN PLANE. DELETE BELOW IF ASTM C 840 REQUIREMENT IS ACCEPTABLE.

B.

Installation Tolerances: Install each steel framing and furring member so that fastening surfaces do not vary more than 1/8 inch from the plane formed by the faces of adjacent framing.

C.

Extend partition framing full height to structural supports or substrates above suspended ceilings, except where partitions are indicated to terminate at suspended ceilings. Continue framing over frames for doors and openings and frame around ducts penetrating partitions above ceiling to provide support for gypsum board.

DELETE BELOW IF PERIMETER RELIEF IS NOT REQUIRED OR REVISE TO SUIT PROJECT IF DEFLECTION TRACK IS SPECIFIED IN PART 2.

1.

Cut studs 1/2 inch short of full height to provide perimeter relief.

RETAIN BELOW OR REVISE TO SUIT PROJECT. FOR COMPLEX CONDITIONS, INCLUDE DETAILS OF CLOSURES ON DRAWINGS.

2.

For STC-rated and fire-resistance-rated partitions that extend to the underside of floor/roof slabs and decks or other continuous solid structural surfaces to obtain ratings, install framing around structural and other members extending below floor/roof slabs and decks, as needed, to support gypsum board closures needed to make partitions continuous from floor to underside of solid structure.

RETAIN ABOVE AND BELOW OR REVISE TO MAKE BELOW THE DEFAULT REQUIREMENT AND ABOVE THE EXCEPTION; OR DELETE BOTH IF NOT APPLICABLE (E.G., NO SUSPENDED CEILINGS).

D.

Install steel studs and furring in sizes and at spacings indicated.

BELOW ARE EXAMPLES OF DEFAULT REQUIREMENTS. ASTM C 754 TABULATES MAXIMUM FRAMING SPACING BASED ON THICKNESS AND ORIENTATION OF GYPSUM BOARD PANELS AND DEFLECTION AND LATERAL LOADING. MFRS' LITERATURE IS ALSO A VALUABLE RESOURCE. RETAIN APPLICABLE REQUIREMENTS OR REVISE. DELETE IF SPACING IS INDICATED ON DRAWINGS.

BELOW CORRESPONDS TO SI (METRIC) MODULE.

1.

Single-Layer Construction: Space studs 24 inches o.c., unless otherwise indicated.

REVISE BELOW IF 16-INCH (406-mm) SPACING IS REQUIRED. ASTM C 754 DOES NOT INCLUDE 16-INCH (406-mm) SPACING FOR DOUBLE-LAYER CONSTRUCTION. IF MULTIPLE LAYERS ARE USED TO ACHIEVE FIRE-RESISTANCE RATING, VERIFY STUD SPACING REQUIREMENTS OF SPECIFIC ASSEMBLIES REQUIRED AND REVISE BELOW TO SUIT PROJECT.

2.

Cementitious Backer Unit Construction: Space studs 16 inches o.c., unless otherwise indicated.

E.

Install steel studs so flanges point in the same direction and leading edge or end of each gypsum board panel can be attached to open (unsupported) edges of stud flanges first.

F.

Frame door openings to comply with GA-219, and with applicable published recommendations of gypsum board manufacturer, unless otherwise indicated. Attach vertical studs at jambs with screws either directly to frames or to jamb anchor clips on door frames; install runner track section (for cripple studs) at head and secure to jamb studs.

USUALLY RETAIN BELOW WITH REQUIREMENT FOR 0.0329-INCH- (0.84-mm-) THICK STUDS IN PART 2 FOR HEAVY DOORS, 200 TO 300 LB (90.72 TO 136.08 kg), UP TO 48 INCHES (1219 mm) WIDE. FRAMING FOR DOORS OVER 48 INCHES (1219 mm) WIDE, DOUBLE DOORS, AND EXTRA-HEAVY DOORS SHOULD BE DESIGNED TO MEET LOADING CONDITIONS.

1.

Install 2 studs at each jamb, unless otherwise indicated.

RETAIN BELOW IF ONE-PIECE ZINC CONTROL JOINTS ARE REQUIRED AT HEAD.

2.

Install cripple studs at head adjacent to each jamb stud, with a minimum 1/2-inch clearance from jamb stud to allow for installation of control joint.

RETAIN BELOW IF SUSPENDED CEILINGS ARE NOT CAPABLE OF WITHSTANDING DOOR OPENING AND CLOSING FORCES.

3.

Extend jamb studs through suspended ceilings and attach to underside of floor or roof structure above.

DELETE BELOW IF NO FRAMED OPENINGS OTHER THAN DOORS, OR REVISE TO SUIT PROJECT. FRAMING INSTALLATION FOR LARGE OPENINGS SHOULD BE FULLY DETAILED.

G.

Frame openings other than door openings to comply with details indicated or, if none indicated, as required for door openings. Install framing below sills of openings to match framing required above door heads.

3.6 INSTALLING GYPSUM SHEATHING

A. Apply sheathing in maximum lengths possible. Apply tongue and groove sheathing with long dimension horizontal.

B. Attach sheathing with screws spaced at 8( o.c. at each support.

C. Abutt ends of sheathing at center of supports. Stagger end joints.

3.7

APPLYING AND FINISHING GYPSUM BOARD, GENERAL

A.

Gypsum Board Application and Finishing Standards: Install and finish gypsum panels to comply with ASTM C 840 and GA-216.

B.

Install sound-attenuation blankets, where indicated, prior to installing gypsum panels unless blankets are readily installed after panels have been installed on one side.

C.

Install ceiling board panels across framing to minimize the number of abutting end joints and to avoid abutting end joints in the central area of each ceiling. Stagger abutting end joints of adjacent panels not less than one framing member.

D. Install gypsum panels with face side out. Do not install imperfect, damaged, or damp panels. Butt panels together for a light contact at edges and ends with not more than 1/16 inch of open space between panels. Do not force into place.

E.

Locate both edge or end joints over supports, except in ceiling applications where intermediate supports or gypsum board back-blocking is provided behind end joints. Do not place tapered edges against cut edges or ends. Stagger vertical joints on opposite sides of partitions. Avoid joints other than control joints at corners of framed openings where possible.

F.

Attach gypsum panels to steel studs so leading edge or end of each panel is attached to open (unsupported) edges of stud flanges first.

G.

Attach gypsum panels to framing provided at openings and cutouts.

DELETE IF GYPSUM PANELS ARE NOT USED OVER WOOD FRAMING.

DELETE BELOW IF HOLLOW METAL DOOR FRAMES ARE NOT USED IN STEEL-FRAMED PARTITIONS.

H.

Spot grout hollow metal door frames for solid-core wood doors, hollow metal doors, and doors over 32 inches wide. Apply spot grout at each jamb anchor clip and immediately insert gypsum panels into frames.

I.

Form control and expansion joints at locations indicated and as detailed, with space between edges of adjoining gypsum panels, as well as supporting framing behind gypsum panels.

J.

Cover both faces of steel stud partition framing with gypsum panels in concealed spaces (above ceilings, etc.), except in chases that are braced internally.

1.

Except where concealed application is indicated or required for sound, fire, air, or smoke ratings, coverage may be accomplished with scraps of not less than 8 sq. ft. in area.

2.

Fit gypsum panels around ducts, pipes, and conduits.

3.

Where partitions intersect open concrete coffers, concrete joists, and other structural members projecting below underside of floor/roof slabs and decks, cut gypsum panels to fit profile formed by coffers, joists, and other structural members; allow 1/4- to 3/8-inch-wide joints to install sealant.

K.

Isolate perimeter of nonload-bearing gypsum board partitions at structural abutments, except floors, as detailed. Provide 1/4- to 1/2-inch-wide spaces at these locations and trim edges with U-bead edge trim where edges of gypsum panels are exposed. Seal joints between edges and abutting structural surfaces with acoustical sealant.

BELOW IS FEASIBLE ONLY WITH WOOD FRAMING WHERE FIRE RATINGS ARE NOT REQUIRED. DELETE FOR METAL-FRAMED GYPSUM BOARD ASSEMBLIES.

L.

Space fasteners in gypsum panels according to referenced gypsum board application and finishing standard and manufacturer's recommendations.

BELOW IS A REQUIREMENT OF BOCA NATIONAL BUILDING CODE. RETAIN IF REQUIRED BY LOCAL CODE.

1.

Space screws a maximum of 12 inches o.c. for vertical applications.

M.

Space fasteners in panels that are tile substrates a maximum of 8 inches o.c.

3.8

GYPSUM BOARD APPLICATION METHODS

A.

Single-Layer Application: Install gypsum wallboard panels as follows:

DELETE BELOW IF NO GYPSUM BOARD CEILINGS.

1.

On ceilings, apply gypsum panels prior to wall/partition board application to the greatest extent possible and at right angles to framing, unless otherwise indicated.

DELETE ABOVE OR BELOW. ORIENTATION OF PANELS AFFECTS FRAMING SPACING AS WELL AS APPEARANCE. SEE EVALUATIONS.

2.

On partitions/walls, apply gypsum panels horizontally (perpendicular to framing), unless parallel application is required for fire-resistance-rated assemblies. Use maximum-length panels to minimize end joints.

a.

Stagger abutting end joints not less than one framing member in alternate courses of board.

USUALLY RETAIN BELOW IF VERTICAL APPLICATION OF PANELS IS SPECIFIED.

B.

Wall Tile Substrates: For substrates indicated to receive thin-set ceramic tile and similar rigid applied wall finishes, install cementitious backer units to comply with ANSI A108.11 at locations indicated to receive wall tile and at all walls of shower stalls.

DELETE BELOW IF EITHER CEMENTITIOUS BACKER UNITS OR GLASS-MAT, WATER-RESISTANT GYPSUM BACKING BOARD IS RETAINED ABOVE. DRAWINGS SHOULD SHOW SEALANT INSTALLED IN 1/4-INCH (6.4-mm) GAP.

DELETE BELOW IF NO GYPSUM BOARD CEILINGS.

C.

Multilayer Application on Ceilings: Apply gypsum board indicated for base layers prior to applying base layers on walls/partitions; apply gypsum wallboard face layers in same sequence. Offset face-layer joints one framing member, 16 inches minimum, from parallel base-layer joints. Apply base layers at right angles to framing members, unless otherwise indicated.

REVISE BELOW IF WALL CONDITIONS PERMIT ECONOMICAL USE OF HORIZONTAL APPLICATION OF BASE LAYER AND LAMINATED ATTACHMENT METHOD IS USED.

D.

Multilayer Application on Partitions/Walls: Apply gypsum board indicated for base layers and gypsum wallboard face layers vertically (parallel to framing) with joints of base layers located over stud or furring member and face-layer joints offset at least one stud or furring member with base-layer joints. Stagger joints on opposite sides of partitions.

DELETE BELOW IF NO Z-FURRING MEMBERS.

E.

Single-Layer Fastening Methods: Fasten gypsum panels to supports with screws.

RETAIN BELOW FOR ATTACHMENT TO METAL OR WOOD SUPPORTS.

F.

Multilayer Fastening Methods: Fasten base layers of gypsum panels and face layer to base layers with screws and face layer with adhesive and supplementary fasteners.

RETAIN ONE OF THE FOLLOWING.

ABOVE AND BELOW ARE SUITABLE FOR METAL OR WOOD SUPPORTS; ABOVE METHOD IS REQUIRED FOR CERTAIN FIRE-RESISTANCE-RATED ASSEMBLIES.

3.9

INSTALLING TRIM ACCESSORIES

A.

General: For trim accessories with back flanges, fasten to framing with the same fasteners used to fasten gypsum board. Otherwise, fasten trim accessories according to accessory manufacturer's directions for type, length, and spacing of fasteners.

BELOW ARE EXAMPLES OF UNIVERSAL SCOPE DEFINITIONS FOR USING TRIM. REVISE AS DESIRED OR SHOW ON DRAWINGS.

B.

Install cornerbead at external corners.

C.

Install edge trim where edge of gypsum panels would otherwise be exposed. Provide edge trim type with face flange formed to receive joint compound, except where other types are indicated.

1.

Install LC-bead where gypsum panels are tightly abutted to other construction and back flange can be attached to framing or supporting substrate.

2.

Install L-bead where edge trim can only be installed after gypsum panels are installed.

DELETE ABOVE OR BELOW. IF ABOVE IS RETAINED, LOCATE JOINTS ON DRAWINGS TO COMPLY WITH ASTM C 840 REQUIREMENTS FOR SPACING CONTROL (EXPANSION) JOINTS.

D.

Install control joints according to ASTM C 840 and manufacturer's recommendations and in specific locations approved by Contracting Officer’s Representative for visual effect.

3.10

FINISHING GYPSUM BOARD ASSEMBLIES

A.

General: Treat gypsum board joints, interior angles, flanges of cornerbead, edge trim, control joints, penetrations, fastener heads, surface defects, and elsewhere as required to prepare gypsum board surfaces for decoration.

B.

Prefill open joints, rounded or beveled edges, and damaged areas using setting-type joint compound.

DELETE ABOVE OR BELOW. STANDARD STEEL OR ZINC TRIM ACCESSORIES HAVE FLANGES FORMED TO RECEIVE JOINT COMPOUND WITHOUT TAPE. RETAIN BELOW IF ALUMINUM AND OTHER TRIM ACCESSORIES REQUIRE TAPE AND JOINT COMPOUND ON FLANGES TO PREVENT CRACKING.

C.

Apply joint tape over gypsum board joints and to flanges of trim accessories as recommended by trim accessory manufacturer.

D.

Levels of Gypsum Board Finish: Provide the following levels of gypsum board finish per GA-214.

DELETE LEVELS BELOW THAT DO NOT APPLY TO PROJECT. GA-214 ALSO INCLUDES LEVEL 0 (NO TAPING, FINISHING, OR ACCESSORIES) FOR TEMPORARY CONSTRUCTION AND WHERE FINAL DECORATION IS UNDETERMINED. IF INSERTING LEVEL 0, MODIFY "APPLY JOINT TAPE" PARA ABOVE TO ALLOW THIS EXCEPTION. GA-216 ALSO INCLUDES RECOMMENDED LOCATIONS FOR EACH FINISH LEVEL. ALTHOUGH THIS INFORMATION MAY BE ADDED TO SUBPARAS BELOW, THE FOLLOWING SUBPARAS ASSUME THAT FINISH LEVEL 4 PREDOMINATES AND EXCEPTIONS WILL BE INDICATED ON DRAWINGS. CORRELATE WITH OTHER PARAS IN ARTICLE SPECIFYING NUMBER OF COATS OF JOINT COMPOUND. SEE EDITING INSTRUCTION NO. 3 IN THE EVALUATIONS.

1.

Level 1 for ceiling plenum areas, concealed areas, and where indicated, unless a higher level of finish is required for fire-resistance-rated assemblies and sound-rated assemblies.

2.

Level 2 where panels form substrates for tile and where indicated.

ACCORDING TO GA-214, LEVEL 5 FINISH BELOW IS SUITABLE FOR SURFACES RECEIVING GLOSS AND SEMIGLOSS ENAMELS AND NONTEXTURED FLAT PAINTS.

3.

Level 5 for gypsum board surfaces where exposed to view for paint or wall covering.

E.

Use the following joint compound combination as applicable to the finish levels specified:

JOINT COMPOUND COMBINATIONS BELOW ASSUME FINISH LEVEL 4 OR 5 IS REQUIRED FOR PROJECT. IF NEITHER LEVEL 4 NOR 5 IS SPECIFIED, DELETE COATS NOT REQUIRED FOR FINISH LEVELS SPECIFIED. CORRELATE PRODUCTS NAMED IN COMBINATIONS BELOW WITH PRODUCTS DESCRIBED IN PART 2 "JOINT TREATMENT MATERIALS" ARTICLE.

DELETE BELOW IF LEVEL 5 IS NOT REQUIRED FOR PROJECT.

1.

Where Level 5 gypsum board finish is indicated, embed tape in joint compound and apply first, fill (second), and finish (third) coats of joint compound over joints, angles, fastener heads, and accessories; and apply a thin, uniform skim coat of joint compound over entire surface. For skim coat, use joint compound specified for third coat, or a product specially formulated for this purpose and acceptable to gypsum board manufacturer. Touch up and sand between coats and after last coat as needed to produce a surface free of visual defects, tool marks, and ridges and ready for decoration.

PARA BELOW ASSUMES LEVEL 4 FINISH IS DEFAULT REQUIREMENT. IF NOT, REVISE OR DELETE PARA TO SUIT PROJECT.

DELETE BELOW IF LEVEL 2 FINISH IS NOT REQUIRED FOR PROJECT.

2.

Where Level 2 gypsum board finish is indicated, embed tape in joint compound and apply first coat of joint compound.

DELETE BELOW IF LEVEL 1 FINISH IS NOT REQUIRED FOR PROJECT.

3.

Where Level 1 gypsum board finish is indicated, embed tape in joint compound.

DELETE BELOW IF EXTERIOR GYPSUM SOFFIT BOARD IS NOT REQUIRED FOR PROJECT.

DELETE BELOW IF NO WATER-RESISTANT GYPSUM BACKING BOARD.

DELETE BELOW IF NO GLASS-MAT, WATER-RESISTANT GYPSUM BACKING BOARD.

DELETE BELOW IF NO CEMENTITIOUS BACKER UNITS OR IF SPECIFIED IN DIVISION 9 SECTION "TILE."

3.11

CLEANING AND PROTECTION

A.

Promptly remove any residual joint compound from adjacent surfaces.

B.

Provide final protection and maintain conditions, in a manner acceptable to Installer, that ensure gypsum board assemblies are without damage or deterioration at the…