Exterior Cement Board Systems (DUROCK) Proprietary. CSI 3-Part Specifications.

07480 - DUROCK EXTERIOR CEMENT BOARD SYSTEMS(10/88)

This section is a proprietary guide specification for exterior walls

with DUROCK Exterior Cement Board manufactured by United States

Gypsum Company. DUROCK is an aggregated portland cement board with

polymer-coated woven glass fiber mesh embedded in its front and back

surfaces. Walls fabricated with DUROCK Exterior Cement Board offer

design flexibility and are lightweight, fire-resistant, and weather-

resistant. They can be finished with ceramic tile, thin brick, stone

aggregate in an epoxy matrix, or DUROCK Exterior Finish, a stucco-

look textured elastomeric coating. This section also specifies USG

metal framing, THERMAFIBER insulation, DURABOND tile setting and

grouting products, and other components of an exterior wall system.

For additional information, refer to United States Gypsum Company

Product Folders No. SA-810 and CB-132 or contact a USG

representative.

This section conforms to the general style and format of MASTERSPEC

Specifications, a product of the American Institute of Architects.

While conforming to the general style and format of MASTERSPEC,

United States Gypsum Company is solely responsible for the quality

and accuracy of the technical content of these suggested guide

specifications. Specifiers must review manufacturer's current

product data, determine the suitability of proposed products and

systems to project conditions, and edit guide specifications to

suit project requirements.

Neither the American Institute of Architects nor the American

Institute of Architects Foundation endorses or recommends use of

this product. It is not the practice of the Institute to test,

review, or endorse any manufacturer's product or to determine the

accuracy of technical claims.

PRODUCT MASTERSPEC

DUROCK EXTERIOR CEMENT BOARD SYSTEMS07480 - #SECTION 07480 - DUROCK EXTERIOR CEMENT BOARD SYSTEMS

PART 1 - GENERAL

RELATED DOCUMENTS

Drawings and general provisions of Contract, including General and

Supplementary Conditions and Division 1 Specification Sections, apply

to this Section.

SUMMARY

VERSATILE DUROCK EXTERIOR CEMENT BOARDS CAN

BE USED WITH A WIDE RANGE OF CONSTRUCTION

MATERIALS, METHODS, AND FINISHES. EDIT

BELOW TO DESCRIBE SCOPE OF THIS SECTION AND

TO COORDINATE WITH OTHER SECTIONS.

This Section includes exterior wall systems constructed of cement

board building panels and related materials, including:

Light gage steel framing.

Exterior finish.

Setting and grouting materials for ceramic tile and thin brick

veneer.

Insulation.

Water barrier membrane.

GENERAL REQUIREMENTS FOR THIN BRICK, SUCH

AS TYPE, SIZE, AND COLOR, CAN BE SPECIFIED

IN THIS SECTION OR IN DIVISION 4. BUT TO

ASSURE COMPATIBILITY WITH DUROCK,

INSTALLATION MATERIALS AND METHODS SHOULD

BE SPECIFIED IN THIS SECTION.

Thin brick veneer is specified in Division 4 Section "Unit Masonry".

WHENEVER POSSIBLE, STEEL FRAMING FOR CEMENT

BOARD BUILDING PANELS SHOULD BE SPECIFIED

IN SAME SECTION AS BUILDING PANELS TO ASSURE

SYSTEM COORDINATION. FOR ADDITIONAL

INFORMATION, SEE USG PRODUCT LITERATURE FOR

UNITED STATES GYPSUM COMPANY STEEL FRAMING

SYSTEMS.

Light gage steel framing is specified in Division 5 Section "Cold-

Formed Metal Framing".

Wood framing is specified in Division 6 Section "Rough Carpentry".

FIRE SAFING MAY BE REQUIRED BETWEEN EDGES

OF FLOOR SLABS AND CURTAIN WALL TYPE

CONSTRUCTION. FOR ADDITIONAL INFORMATION,

SEE USG PRODUCT LITERATURE FOR THERMAFIBER

FIRE SAFING INSULATION.

Fire safing insulation is specified in Division 7 Section

"Firestopping".

Flashings are specified in Division 7 Section "Flashing and Sheet

Metal".

Sealants for joints in wall system and perimeter sealing are

specified in Division 7 Section "Joint Sealers".

VERIFY SUBSTRATE REQUIREMENTS WITH AGGREGATE

COATING MANUFACTURER.

Stone aggregate in epoxy matrix is specified in Division 9 Section

"Aggregate Coatings".

SEE USG PRODUCT LITERATURE FOR COMPATIBLE

DRYWALL PRODUCTS FROM UNITED STATES GYPSUM

COMPANY.

Gypsum drywall for interior finishes of exterior walls is specified

in Division 9 Section "Gypsum Drywall".

GENERAL REQUIREMENTS FOR TILE, SUCH AS TYPE,

SIZE, AND COLOR, CAN BE SPECIFIED IN THIS

SECTION OR DIVISION 9. BUT TO ASSURE

COMPATIBILITY WITH DUROCK, INSTAL-LATION

MATERIALS AND METHODS SHOULD BE SPECIFIED

IN THIS SECTION. SEE USG PRODUCT LITERA-TURE

FOR DURABOND TILE SETTING AND GROUTING

PRODUCTS WHICH ARE COMPATIBLE WITH MATERIALS

SPECIFIED IN THIS SECTION.

Ceramic tile veneer is specified in Division 9 Section "Tile".

QUALITY ASSURANCE

DELETE OR MODIFY FIRE-RESISTANCE RATING AS

REQUIRED FOR PROJECT. OTHER APPLICABLE UL

DESIGNS INCLUDE U457 AND U458. EDIT SECTION

TO CONFORM TO SELECTED UL DESIGN REQUIRE-

MENTS.

Fire-Resistance Rating: As indicated by reference to design

designation in UL "Fire Resistance Directory"; tested per ASTM E 119.

Steel Framing: UL Design U442.

Wood Framing: UL Design U329.

USG CAN NOT ACCEPT RESPONSIBILITY FOR

PERFORMANCE OF DUROCK EXTERIOR CEMENT BOARD

OR OTHER DUROCK COMPONENTS WHEN USED WITH

PRODUCTS WHICH HAVE NOT BEEN TESTED AND

APPROVED BY UNITED STATES GYPSUM COMPANY AS

PART OF THE DUROCK EXTERIOR CEMENT BOARD

SYSTEM.

Single-Source Responsibility: Obtain panel system components from

a single manufacturer, or from manufacturers recommended by the prime

manufacturer of cement boards.

SUBMITTALS

Product Data: Submit manufacturer's product literature, specifi-

cations, and installation instructions for each type of component

specified, including other data as may be required to show compli-ance

with these specifications.

Samples: Submit samples as listed below.

EDIT BELOW TO SUIT PROJECT.

Cement Board: 12 x 12 inches, apply exterior finish to one side

in color and texture required.

Metal Framing: 12 inches length, each type.

Fastener: Each type.

Reinforcing Tape: 12 inches length.

Membrane: 12 x 12 inches.

EDIT BELOW AS REQUIRED. DELETE IF COLORS

ARE PRESELECTED AND SCHEDULED.

Grout Samples for Initial Selection Purposes: Submit samples of

grout and exterior finish showing full range of colors available.

RETAIN BELOW IF REQUIRED TO COORDINATE WITH

TILE SUBMITTAL REQUIREMENTS.

Grout Samples for Verification Purposes: Submit samples of grout

applied to tile sample boards specified in Division 9 Section

"Tile".

SPECIFY ASSEMBLY SAMPLE ONLY IF REQUIRED BY

SPECIAL CONDITIONS.

Assembly: Provide 2 x 2 feet sample of assembled panel system,

containing all compon-ent materials as specified in this section

and representa-tive veneer and finish applications as specified

for the completed system; cut-away construction to illustrate

construc-tion and attachments.

DELETE BELOW IF NOT REQUIRED

Certification for Fire Test Performance: Submit manufacturer's fire

test report or written certification that assembly systems have been

tested by an independent laboratory and comply with required fire

test perform-ance.

DELIVERY, STORAGE AND HANDLING

Deliver materials in original unopened packages, containers, or

bundles bearing brand name and identification of manufacturer or

supplier.

Store materials in an enclosed shelter in manner to keep them dry,

protected from weather, surface contamination, and damage from

construction traffic and other causes. Neatly stack cement boards

flat to prevent sagging. Protect emulsion products from freezing.

Handle cement boards to prevent damage to edges, ends or sur-faces.

Protect metal framing members from being bent or damaged. If gypsum

boards are utilized, handle and store similar to cement boards.

PROJECT CONDITIONS

Environmental Requirements, General: Comply with requirements of

referenced products application standards and recommendations of

manufacturer, for environmental conditions before, during and after

application of materials.

Weather Protection: Do not apply finishes to exterior cement board

if surface is wet, frozen, or contains frost; or when ambient

temperature is below 45 deg F (13 deg C). For at least 24 hours

after application of finish materials, maintain temperature at 45

deg F (13 deg C) minimum and protect from expos-ure to rain and mois-

ture.

PART 2 - GENERAL

MANUFACTURER

Subject to compliance with requirements, provide products manufac-

tured or supplied by United States Gypsum Company (USG), unless

otherwise indicated.

STEEL FRAMING MATERIALS

FRAMING IS ALSO AVAILABLE IN SOME AREAS WITH

ALUMINIZED FINISH PER ASTM A 463 OR WITH AN

ALUMINUM-ZINC ALLOY COATING, PER ASTM A 792.

Steel Framing - General: Uncoating steel thickness shall comply with

ASTM A 568. Hot-dipped galvanize to comply with ASTM A 525 G60.

Fabricate to comply with ASTM C 645.

SHOW RUNNER AND STUD DEPTH, TYPE, AND GAGE

ON DRAWINGS OR SPECIFY IN PARAGRAPHS BELOW.

Runners: USG Types CR and UR, 33 ksi minimum yield strength, gage

as shown on drawings, depth to match studs.

Studs: Size and gage as shown on drawings; provide following types:

USG Type SJ, 40 ksi minimum yield strength.

USG Type ST, 33 ksi minimum yield strength.

Steel Framing Fasteners: USG Type S-12 self-drilling screws, 1/2

inch long pan head type or 5/8 inch long low profile head type with

CLIMASEAL corrosion resistant finish.

Anchors: Provide types required to securely attach framing to

adjacent construction.

FOLLOWING ARE EXAMPLES ONLY. SPECIFY

FASTENERS SUITABLE FOR CONDITIONS OF USE.

Concrete: 5/32 inch diameter low-velocity power-driven fastener

with 1-1/2 inches minimum penetration.

Steel: Self-drilling screws.

Plywood Subfloor and Steel Joist Framing: Type S-12 pilot-point

screws, 1-15/16 inches long.

Curtain Wall Clip: USG Curtain Wall Slide Clip.

Framing Accessories: Provide bracing, blocking, metal angles, and

other accessories as shown on drawings and as required for applica-

tion intended.

CEMENT BOARD MATERIALS

DUROCK EXTERIOR CEMENT BOARD CAN ALSO BE

USED AS AN INTERIOR TILE BACKER BOARD, SEE

USG PRODUCT FOLDER SA-932 OR PRODUCT

MASTERSPEC SECTION 09390 - "DUROCK INTERIOR

TILE BACKER BOARD".

Cement Board: USG DUROCK Exterior Cement Board; aggregated portland

cement board with polymer-coated, woven glass-fiber mesh embedded in

front and back surfaces.

Thickness: 1/2 inch minimum.

Size: 4 feet wide x 8 feet long.

Faces: Smooth on one side, coarse on other side.

Edges: Formed, smooth, reinforced edges; square cut ends.

Weight:3 pounds per square foot maximum.

Flexural Strength: 1000 psi minimum per ASTM C 947.

Water Absorption: 10% by weight max., 24 hr. per ASTM C 948.

Nail Pull Resistance: 125 lbs. min., 0.4 inch head diameter, wet

or dry, per ASTM C 473.

Freeze/Thaw: 100 cycles with no deter-ioration per ASTM C 666

Procedure A.

Flame Spread, Smoke Developed: 5, 0 per ASTM E 84.

Cement Board Fasteners: DUROCK Screws, wafer head, self-drilling

screw with CLIMASEAL corrosion resistant finish.

Metal Framing: Type S-12, 1-1/4 inches or 1-5/8 inches.

Use 1-5/8 inches fasteners when cement board is installed over

1/2 inch maximum rigid foam insulation.

Wood Framing: Type S, 1-5/8 inches.

Joint Reinforcement: As follows:

Reinforcing Tape: DUROCK Exterior Tape, 2 inches wide, polymer-

coated woven glass-fiber mesh with pressure-sensitive adhesive on

one side.

Joint Compound: USG DUROCK Exterior Basecoat; ready-to-mix

portland cement mortar containing dry latex polymers; gray.

Surface Control Joint: USG No. 093 control joint, roll-formed zinc.

Trim Accessories: DUROCK corner beads and 1/2 inch trim angles; zinc

alloy.

Water Barrier: TYVEK HOUSEWRAP, high density polyethylene fiber

water and air barrier, manufactured by E.I. duPont de Nemours &

Company.

NO. 15 ASPHALT FELT CAN BE SPECIFIED INSTEAD

OF TYVEK.

Staples: 1/2 inch crown, 3/8 inch leg; galvanized.

INSULATION

SHOW INSULATION THICKNESS OR R-VALUE ON

DRAWINGS OR SPECIFY BELOW. INSULATION

CONSIDER-ATIONS INCLUDE THERMAL REQUIREMENTS,

VAPOR BARRIER REQUIREMENTS, FIRE PERFORMANCE

CHARACTERISTICS, AND CONDITIONS OF USE.

Blanket Insulation: THERMAFIBER Mineral Fiber Insulation, thickness

or R-value as shown on drawings.

THERMAFIBER Sound Attenuation Fire Blankets (SAFB); ASTM C 665,

Type I; 15 flame spread, 0 smoke developed.

THERMAFIBER Fire Safety FS-15 Insulating Blankets; ASTM C 665,

Type I; 15 flame spread, 0 smoke developed.

THERMAFIBER Fire Safety FS-25 Insulating Blankets, foil faced;

ASTM C 665, Type III; 25 flame spread, 5 smoke developed.

THERMAFIBER Aluminum Foil-Faced Blankets, foil faced vapor

retarder with nailing flanges; ASTM C 665, Type III.

Fire Safing Insulation: THERMAFIBER Safing Insulation and steel

safing clips.

RIGID INSULATION MAY BE REQUIRED WHEN USING

DUROCK EXTERIOR FINISH TO HELP CONTROL

POTENTIAL "SHADOWING" ON SURFACE OF WALL DUE

TO CONDENSATION. SPECIFY TYPE OF RIGID FOAM

INSULATION REQUIRED. DO NOT USE EXPANDED

POLYSTYRENE (EPS OR "BEAD BOARD") OR EXCEED

1/2 INCH THICKNESS. SEE USG PRODUCT

LITERATURE OR REPRESENTATIVE FOR ADDITIONAL

INFORMATION.

EXTERIOR FINISH MATERIALS

INCLUDE THIS ARTICLE FOR DUROCK EXTERIOR

FINISH, A STUCCO-LOOK, WEATHER RESISTANT,

TEXTURED COATING.

Base Coat: USG DUROCK Exterior Basecoat; ready-to-mix portland

cement mortar containing dry latex polymers; gray.

Textured Coating: USG DUROCK Exterior Finish; acrylic coating, ready

mixed; fine or coarse formulation and color as selected from

manufacturer's standards.

Mixing: Mix in accordance with manufacturer's instructions. Water

shall be clean and potable.

SETTING AND GROUTING MATERIALS

INCLUDE THIS ARTICLE IF CERAMIC TILE OR THIN

BRICK VENEER FINISHES ARE USED. WHITE

MORTAR AND GROUT ARE ALSO AVAILABLE.

Skim Coat and Mortar: DUROCK or DURABOND Latex Fortified Mortar;

ready-to-mix, thin-set mortar containing dry latex polyme-rs,

especially formulated for use with DUROCK Exterior Cement Board; gray

or white.

Grout: DUROCK Latex Fortified Grout; ready-to-mix grout containing

dry latex polymers, especially formulated for use with DUROCK

Exterior Cement Board; gray or white.

Mixing: Mix in accordance with manufacturer's instructions. Water

shall be clean and potable.

SPECIFICATIONS FOR TILE, THIN BRICK,

AGGREGATE COATING, OR OTHER FINISH MATERIALS

CAN BE INSERTED HERE. COORDINATE WITH WORK

SPECIFIED IN OTHER SECTIONS.

PART 3 - EXECUTION

GENERAL

Comply with manufacturer's printed installation instructions for

products and applications indicated, except where more stringent

requirements apply.

RETAIN BELOW IF RATED CONSTRUCTION IS

REQUIRED.

Conform to construction requirements of tested assemblies used to

demonstrate required fire resistance.

EXAMINATION

Coordinate work of this section with building structural system;

ensure anchorage provisions have been installed to receive cement

board system.

RETAIN BELOW IF WOOD OR METAL FRAMING ARE

SPECIFIED IN ANOTHER SECTION.

Examine framing for compliance with requirements and conditions

affecting work of this section. Do not proceed with installation

until unsatisfactory conditions have been corrected.

STEEL FRAMING INSTALLATION

SPACING FOR RUNNER ATTACHMENT AND STUDS

SHOULD BE SHOWN ON DRAWINGS OR SPECIFIED

BELOW. SPACING SHOULD BE DETERMINED BY

ARCHITECT OR ENGINEER IN ACCORDANCE WITH

GUIDELINES CONTAINED IN USG PRODUCT

LITERATURE. WHERE REQUIRED BY POTENTIAL

DEFLECTION OF BUILDING STRUCTURE, INDICATE

ADDITIONAL REQUIREMENTS TO ALLOW FOR

"FLOATING" CONSTRUCTION OF EXTERIOR WALLS.

Runners: Accurately align and secure to base and head with power-

driven fasteners spaced as shown on drawings.

Studs: Position vertically in runners at spacing shown on drawings.

Anchor each stud to runner with four screws, two at top and two at

bottom, with one screw in each flange.

At building control joints that extend through wall, provide breaks

in top and bottom runner track. Install 1-1/2 inch cold-rolled

channel alignment stabilizers spaced maximum 5 feet o.c. vertically.

Place channels through holes in stud web of the first two adjacent

studs on both sides of the joint, and securely attached to the first

adjacent stud on either side of the joint.

SHOW DETAILS OF PENETRATIONS ON DRAWINGS.

At wall penetrations such as windows and doors, provide additional

reinforcement at header, sill, and jambs to transfer and support

loads.

Provide framing accessories and curtain wall clips as shown and

drawings and as required for conditions of use.

RIGID FOAM INSULATION

Install rigid foam insulation over framing with fasteners adequate

to hold in place until covered by cement boards. Butt ends and edges

and stagger joints.

WATER BARRIER

Install water barrier in shingle-like manner beginning at bottom of

wall. Overlap edges 2 inches.

CEMENT BOARD

Apply cement board panels with coarse side towards exterior and with

ends over supports. Stagger end joints in successive courses. Fit

ends and edges closely, but not forced together.

Fasten cement board panels to framing with specified fasteners.

Space 8 inches o.c. at walls, 6 inches o.c. at soffits. Drive

fasteners in field of panels first, working towards ends and edges.

Hold panel in firm contact with framing while driving fasteners.

Locate peri-meter fasteners at least 3/8 inch from ends and edges.

Drive screws so heads are flush with surface of panels. Provide firm

panel contact with framing.

Reinforcing Tape: Apply over joints and corners except where corner

beads or control joints are used. Do not overlap.

USE TRIM ACCESSORIES WITH DUROCK EXTERIOR

FINISH AND, IF REQUIRED, WITH AGGREGATE

COATING. OPTIONAL TRIM ANGLES CAN BE USED

AT PERIMETER OF CEMENT BOARD PANEL SYSTEM.

Trim Accessories: Install corner beads at outside corners. Install

trim angles where shown on drawings. Fasten with staples.

Vent soffits as shown on drawings.

EXPANSION AND CONTRACTION

Provide surface control joints where shown on drawings and as

follows:

ADJUST LISTING BELOW TO PROJECT.

Wall abuts a structural element or dissimilar wall or surface.

Construction changes within the plane of the wall.

At control or expansion joints in underlaying construction.

12 feet o.c. maximum.

Separate cement boards behind control joints. Where vertical and

horizontal control joints intersect, vertical control joints shall

be continuous and horizontal control joints shall abut. Apply

sealant to splices, terminals, and intersections of control joints

as specified in Division 7 Section "Joint Sealers".

BLANKET AND SAFING INSULATION

Blanket Insulation: Install to completely fill stud cavity to

thickness required. Tightly butt ends and sides of blankets.

Staple nailing flanges to sides of wood studs and plates, do

not attach to face of framing.

RETAIN ABOVE WITH USING WOOD FRAMING AND

INSULATION BLANKETS WITH NAILING FLANGES.

RETAIN BELOW IF USING INSULATION BLANKETS

WITH VAPOR RETARDER.

Install vapor retarder towards the predominately warm, humid

side of the exterior wall.

Safing Insulation: Install at perimeter of fire rated floor slabs

and where shown on drawings. Secure with safing clips spaced 24

inches o.c. maximum.

RETAIN FOLLOWING IF EXTERIOR FINISH SYSTEM

IS REQUIRED.

EXTERIOR FINISH SYSTEM

Surfaces to receive exterior finish shall be clean and dry prior to

application.

Joints: Apply base coat material over reinforcing tape and trim

acces-sories and flush with adjacent cement board. Force base coat

through tape to fill and level joints, or prefill joints and then

tape and level joints. Allow to set 24 hours before application of

base coat.

Base Coat: Apply 1/16 inch minimum thick base coat over entire

surface. Base coat shall be uniform, smooth, and flat. Allow to

set 24 hours before application of exterior finish.

Textured Coating: Provide 1/16 inch minimum, 3/16 inch maximum

coating thickness in specified texture.

SPECIFY REQUIRED TEXTURE BELOW.

Lace Finish: Trowel on a first coat. Before surface moisture

leaves, skip-trowel on second coat with trowel held flat.

Spanish Finish: Trowel on a smooth first coat. Apply a second

coat using random, overlapping trowel strokes.

Sandstone Finish: Trowel on a first coat and immediately double

back with a second coat. Using a sponge float, press surface to

achieve required texture.

Float Finish: Trowel on finish and immediately double back with

a second coat. Rub surface with a wood float using a uniform,

circular motion to bring sand particles up to the surface.

RETAIN FOLLOWING IF TILE OR THIN BRICK

VENEER IS REQUIRED. CHANGE "TILE" TO "THIN

BRICK" BELOW AS REQUIRED.

TILE OR THIN BRICK VENEER

Comply with applicable requirements of Division 4 Section "Unit

Masonry".

RETAIN ABOVE FOR THIN BRICK OR BELOW FOR

TILE. IF RELATED SECTION IS NOT INCLUDED

IN PROJECT MANUAL, IT MAY BE NECESSARY TO

EXPAND THIS SECTION TO SPECIFY ADDITIONAL

REQUIRE-MENTS.

Comply with applicable requirements of Division 9 Section "Tile".

Skim Coat: Apply uniform 1/8 inch minimum thick coat of mortar over

cement board. Surface shall be smooth and flat. Allow to set 24

hours before application of tile or thin brick.

Installation: Comply with ANSI A108.5 requirements for thin-set

installation. Use notched trowel of size required by thickness of

tile or thin brick. Apply uniform setting bed to skim coated

surface. Back-butter tile or thin brick and firmly press into

freshly applied mortar; use sliding and twisting motion to embed

units and obtain complete mortar contact. Allow mortar to set for

24 hours before applica-tion of grout.

Grout: Comply with ANSI A108.10 and TCA Handbook for Ceramic Tile

Installation. Force maximum amount of grout into joints and tool

grout into joints to provide neat and uniform appearance. Clean

grout from finished surfaces. Cure grout as required.

RETAIN FOLLOWING IF AGGREGATE COATING IS

REQUIRED.

AGGREGATE COATING

Apply taped cement board surface as specified in Division 9 Section

"Aggregate Coatings".

SEALANTS

Apply sealants around perimeter of and penetrations through cement

board building panel systems as specified in Division 7 Section

"Joint Sealers".

END OF SECTION 07480

PRODUCT MASTERSPEC - EVALUATIONS

DUROCK EXTERIOR CEMENT BOARD SYSTEMS07480 - E#SECTION 07480 - DUROCK EXTERIOR CEMENT BOARD SYSTEMS

EVALUATION SHEETS

USG TECHNICAL SERVICES DEPARTMENT:

Eastern Construction Products Region

P.O. Box 16511, Atlanta, GA 30321

1000 Abernathy Road N.E., Suite 500, Atlanta, GA 30328-5603

(404) 393-0770

Northeast Office

555 White Plains Road, Tarrytown, NY 10591-5155

(914) 332-0800

Central Construction Products Region

1 South Wacker Drive, Suite 2000, Chicago, IL 60680-4616

P.O. Box 806278, Chicago, IL 60680-4124

(312) 606-4128

Western Construction Products Region

P.O. Box 2452, Los Angeles, CA 90054

620 North Brand Boulevard, Glendale, CA 91203-1212

(818) 956-1882

Architectural & Construction Services Department

101 South Wacker Drive, Chicago, IL 60606-4385

(312) 606-3739

USG PRODUCT LITERATURE:

Product literature is available from United States Gypsum Company

Representatives; contact USG for current information.

System Folder SA-810, DUROCK Exterior Cement Board Systems,

Sweet's General Building and Renovation File 08900/USG.

USG DUROCK Exterior Finish brochure CB-132.

Gypsum Construction Handbook, 3rd edition.

Computer Diskette with USG Guide Specifications.

REFERENCED STANDARDS:

Standards referenced in the text of this section are listed below

according to source, designation, and title. Revision of standards

occur periodically and may happen before this section is updated in

the future. Refer to Division 1 section "Definitions and Standards"

for addresses and telephone numbers.

American National Standards Institute (ANSI):

A108.5Installation of Ceramic Tile with Dry-Set Portland

Cement Mortar or Latex-Portland Cement Mortar.

A108.10Installation of Grout in Tilework.

American Society for Testing and Materials (ASTM):

A 463Specification for Steel Sheet, Cold-Rolled, Aluminum-

Coated, Type 1 and Type 2.

A 525Specification for General Requirements for Steel

Sheet, Zinc-Coated (Galvanized) by the Hot-Dip

Process.

A 568Specification for General Requirements for Steel,

Carbon and High-Strength Low-Alloy Hot-Rolled Sheet

and Cold-Rolled Sheet.

A 742Specification for General Requirements for Steel

Sheet, Aluminum-Zinc Alloy-Coated by the Hot-Dip

Process.

C 473Methods for Physical Testing of Gypsum Board Products

and Gypsum Lath.

C 645Specification for Non-Load (Axial) Bearing Steel

Studs, Runners (Track), and Rigid Furring Channels

for Screw Application of Gypsum Board.

C 665Specification for Mineral-Fiber Blanket Thermal

Insulation for Light Frame Construction and

Manufactured Housing.

C 666Test Method for Resistance of Concrete to Rapid

Freezing and Thawing.

C 947Test Method for Flexural Properties of Thin-Section

Glass-Fiber-Reinforced Concrete (Using Simple Beam

with Third-Point Loading).

C 948Test Method for Dry and Wet Bulk Density Water

Absorption, and Apparent Porosity of Thin Sections of

Glass-Fiber Reinforced Concrete.

E 84Method for Surface Burning Characteristics of Building

Materials.

E 119Methods of Fire Tests of Building Construction and

Materials.

Tile Council of America (TCA):

Handbook for Ceramic Tile Installation.

Underwriters Laboratory, Inc. (UL):

Fire Resistance Directory.

NOTICES:

Trademarks: The following trademarks used herein are owned by USG

Corporation or its subsidiaries: USG, DURABOND, DUROCK, and

THERMAFIBER. CLIMASEAL, S, and S-12 are registered trademarks of

ITW Buildex. TYVEK HOUSEWRAP is a registered trademark of E.I.

duPont de Nemours & Company.

Notice: USG Corporation and its subsidiaries shall not be liable

for incidental and consequential damages, directly or indirectly

sustained, nor for any loss caused by application of these goods not

in accordance with printed instructions or for other than the

intended use. Our liability is expressly limited to replacement of

defective goods. Any claim shall be deemed waived unless made in

writing to us within thirty (30) days from date it was or reasonably

should have been discovered.

Note: All products described here may not be available in all

geographic markets. Consult your local sales office or represen-

tative for information.

PRODUCT MASTERSPEC - DRAWING COORD

DUROCK EXTERIOR CEMENT BOARD SYSTEMS07480 - D#SECTION 07480 - DUROCK EXTERIOR CEMENT BOARD SYSTEMS

DRAWING COORDINATION

In addition to general MASTERSPEC Instructions for coordinating

drawings with specifications, it is suggested that drawings indicate

the following information related to this section:

Locations and dimensions of cement board building panels.

Types of finishes and changes in finishes or colors, if any.

Typical framing details including size, gage, and type of runners

and studs, means of attachment to adjacent construction and

fastener spacing, stud spacing, and framing accessories.

Insulation R-value or thickness.

Location of trim, control joints, soffit vents, and other

accessories.

Flashings, penetrations, sealants, interior finishes, vapor

retarders, and other related work.

Suggested Details: Additional details are shown in USG product

literature listed on Evaluation Sheets. Technical assistance in

preparing details is also available from USG Representatives.

PRODUCT MASTERSPEC - SPEC COORD

DUROCK EXTERIOR CEMENT BOARD SYSTEMS07480 - S#SECTION 07480 - DUROCK EXTERIOR CEMENT BOARD SYSTEMS

SPECIFICATION COORDINATION

DUROCK Exterior Cement Board Systems consist of components which have

been designed and tested together as an integrated exterior wall

assembly. While each of the components of the system could be

specified in other sections, it is strongly recommended that all

exterior wall components be specified in the same section. This will

help assure the performance of the exterior wall system and provide

single source responsibility.

In some instances, however, it may be necessary to specify some

components of the DUROCK Exterior Cement Board Systems in other

sections to avoid duplication of specification requirements. For

example, a thin brick used as a veneer for DUROCK Exterior Cement

Board might also be used on the interior of a building on DUROCK Tile

Backer Board, gypsum board, or other substrates. In this case, the

thin bricks could be specified in a Division 4 section with cross-

references to this section for the setting and grouting materials and

installation required on DUROCK Exterior Cement Board.

The following sections of the specifications have specific

requirements which must be coordinated with this Section.

-Division 4 Section "Unit Masonry": Coordinate requirements for

thin brick veneer.

-Division 5 Section "Cold-Formed Metal Framing": Coordinate

requirements for light gage steel framing.

-Division 6 Section "Rough Carpentry": Specify wood framing.

-Division 7 Section "Building Insulation": Coordinate requirements

for thermal insulation.

-Division 7 Section "Firestopping": Specify fire safing.

-Division 7 Section "Flashing and Sheet Metal": Specify through-

wall flashings.

-Division 7 Section "Joint Sealers": Coordinate requirements for

sealants.

-Division 9 Section "Aggregate Coatings": Coordinate requirements

for aggregate coating system.

-Division 9 Section "Gypsum Drywall": Specify gypsum board

finishes for interior of exterior wall.

-Division 9 Section "Tile": Coordinate requirements for ceramic

tile veneer.