Tile Backer Boards (DUROCK). CSI 3-Part Specifications.

SECTION 09390

DUROCK INTERIOR TILE BACKER BOARD

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Use this guide specification to specify DUROCK Interior Tile

Backer Board systems. Review a copy of USG Publication SA-932

before editing specification

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PART 1 - GENERAL

GENERAL DOCUMENTS

Drawings and general provisions of Contract, including General

and Supplementary Conditions and Division 1 Specification

Sections, apply to this Section.

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EDIT THIS ARTICLE TO DESCRIBE SCOPE OF THIS SECTION AND TO

COORDINATE WITH OTHER SECTIONS.

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This Section includes tile backer boards. Extent of tile backer

board is shown on drawings, and includes:

Underlayment for tiled floors and countertops.

Backer board for tiled walls and ceilings.

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TO ASSURE COMPATIBILITY OF TILE BACKER BOARD WITH TILE SETTING

AND GROUTING MATERIALS, UNITED STATES GYPSUM COMPANY RECOMMENDS

THAT THE TILE SETTING AND GROUTING MATERIALS LISTED IN THIS GUIDE

SPECIFICATION BE USED WITH DUROCK TILE BACKER BOARDS.

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This Section also includes related materials including:

Setting and grouting materials for installation of tile to tile

backer boards.

Acoustical sealant and sound insulation.

Wood framing, furring, and subfloor are specified in Division 6

Section "Rough Carpentry."

Countertop base is specified in Division 6 Section "Architectural

Woodwork".

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RETAIN BELOW IF REQUIRED WATER RESISTANCE EXCEEDS CAPABILITY OF

WATER BARRIER SPECIFIED IN THIS SECTION.

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Waterproofing for stud cavity or floor framing is specified in

Division 7 Section "Waterproofing."

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RETAIN BELOW IF FIRE RATED PARTITIONS ARE REQUIRED. FOR

ADDITIONAL INFORMATION ON FIRE STOPS, SEE USG PRODUCT LITERATURE

FOR THERMAFIBER FIRE SAFING INSULATION AND SMOKE-STOP SYSTEMS.

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Fire stop insulation and sealants, required at penetrations

through fire resistive partitions, are specified in Division 7

Section "Firestopping".

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EDIT BELOW TO SUIT PROJECT. GYPSUM BOARD BASE LAYER AND

INSULATION ARE REQUIRED FOR SEVERAL OF THE DUROCK CEMENT BOARD

FIRE AND SOUND RATED SYSTEMS. AT SPECIFIER'S OPTION, THEY CAN BE

SPECIFIED IN EITHER THIS SECTION OR DIVISION 9 SECTION "GYPSUM

DRYWALL". IF SPECIFIED IN GYPSUM DRYWALL, PROVIDE CROSS

REFERENCE TO THIS SECTION AND COMPLY WITH REQUIREMENTS FOR RATED

ASSEMBLIES. SEE USG PRODUCT LITERATURE FOR COMPATIBLE PRODUCTS

FROM UNITED STATES GYPSUM COMPANY.

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Metal framing, gypsum drywall, and insulation are specified in

Division 9 Section "Gypsum Drywall."

Gypsum board base layer for installation under tile backer board

is specified in this section.

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IF STONE, THIN BRICK, OR OTHER FINISH MATERIAL IS USED INSTEAD OF

TILE, EDIT BELOW AND CHANGE REFERENCES THROUGHOUT SECTION.

SEE USG PRODUCT LITERATURE FOR DURABOND TILE SETTING AND GROUTING

PRODUCTS WHICH ARE COMPATIBLE WITH MATERIALS SPECIFIED IN THIS

SECTION.

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Tile is specified in Division 9 Section "Tile".

SYSTEM DESCRIPTION

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IF FIRE RATED OR SOUND RATED PARTITIONS ARE REQUIRED, MODIFY

BELOW EXAMPLE ACCORDING TO PERFORMANCE LEVELS REQUIRED BY

PROJECT.

COORDINATE RELATED WORK SPECIFIED IN OTHER SECTIONS TO MAINTAIN

INTEGRITY OF RATED ASSEMBLIES. SEE CURRENT USG PRODUCT

LITERATURE FOR AVAILABLE RATINGS AND SYSTEMS.

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Performance: Construct partition in accordance with requirements

of tested and approved designs to obtain the following:

Sound Rating: Sound Transmission Class (STC) not less than 61

when tested in accordance with ASTM E 336 and classified in

accordance with ASTM E 413; USG Test No. SA-851028.

Fire Rating: 2 hour minimum, ASTM E 119. Comply with UL Design

U443 and Council of American Building Officials (CABO) National

Evaluation Service Committee Report No. NER-259.

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OMIT BELOW DESCRIPTION IF PARTITION IS ADEQUATELY DETAILED ON

DRAWINGS. MODIFY FOLLOWING EXAMPLE IN ACCORDANCE WITH PROJECT

REQUIREMENTS.

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Description:

Studs: 3-5/8 inches nominal, 25 gage steel studs, non-load

bearing.

Wall Boards: Tile backer board installed over gypsum board base

layer, both sides of partition.

Where tile finish is not required on both sides of a partition,

omit tile backer board from un-tiled side and provide a double

layer of gypsum board as specified in Division 9 Section "Gypsum

Drywall".

Sound Insulation: 3 inches thick.

SUBMITTALS

Product Data: Submit manufacturer's data for each type of

component and system specified, including performance ratings,

details of construction, materials, and installation

instructions.

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DELETE BELOW IF RATINGS ARE NOT REQUIRED OR IF PRODUCT DATA

SUBMITTAL IS SUFFICIENT.

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Test Reports: Submit test reports from qualified testing

laboratories indicating compliance with fire and sound resistance

requirements.

Samples: Submit standard size sample of tile backer board.

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EDIT BELOW AS REQUIRED. DELETE IF COLORS ARE PRESELECTED AND

SCHEDULED.

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Samples for Initial Selection Purposes: Submit samples of grout

showing full range of colors available.

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RETAIN BELOW IF REQUIRED TO COORDINATE WITH TILE SUBMITTAL

REQUIREMENTS.

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Samples for Verification Purposes: Submit samples of grout

applied to tile sample boards specified in Division 9 Section

"Tile".

DELIVERY, STORAGE, AND HANDLING

Deliver materials in their original unopened packages,

containers, or bundles bearing brand name and identification of

manufacturer or supplier.

Store materials under cover and in manner to keep them dry,

protected from weather, direct sunlight, surface contamination,

corrosion and damage from construction traffic and other causes.

Protect tile setting and grouting materials from freezing. Neatly

stack tile backer boards to prevent sagging; stack flat, on

continuous surface, and without skids.

Handle tile backer boards to prevent damage to edges, ends or

surfaces. Remove damaged or deteriorated materials from site.

PROJECT CONDITIONS

Cold Weather Protection: In cold weather, maintain continuous,

uniform, building temperatures of not less than 45 deg F (13 deg

C) or more than 100 deg. F (38 deg. C) for a minimum period of 48

hours prior to, during, and following tile backer board and tile

installation.

Conditioning: Store tile backer board in spaces where it is to

be installed for 48 hours prior to installation. Do not install

board when it is wet.

Ventilation: Ventilate building spaces as required to remove

excess moisture.

PART 2 - PRODUCTS

MANUFACTURER

Subject to compliance with requirements, provide products

manufactured or supplied by United States Gypsum Company.

MATERIALS

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DUROCK EXTERIOR CEMENT BOARD CAN ALSO BE USED AS A TILE BACKER

BOARD. DUROCK EXTERIOR CEMENT BOARD HAS GREATER FLEXURAL

STRENGTH THAN DUROCK TILE BACKER BOARD.

SINCE IT IS AVAILABLE IN SHEETS 4 FEET WIDE BY 8 FEET LONG, IT

CAN BE USED ECONOMICALLY ON LARGE WALL AND FLOOR AREAS WHERE IT

REDUCES THE NUMBER OF JOINTS TO BE TREATED.

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FOR ADDITIONAL INFORMATION, SEE USG PRODUCT FOLDER SA-700. DO

NOT USE DUROCK INTERIOR TILE BACKER ON BUILDING EXTERIOR.

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Tile Backer Board: DUROCK Interior Tile Backer Board; aggregated

portland cement board with vinyl-coated, woven glass-fiber mesh

embedded in back and front surfaces.

Thickness: 1/2 inch minimum.

Size: 3 feet wide; 4, 5, or 6 feet long.

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

Edges: Formed smooth edges; square cut ends.

Weight:3 pounds per square foot.

Flexural Strength: 750 psi minimum per ASTM C 947.

Compressive Strength: 2300 psi minimum with 1 inch diameter disk

per ASTM D 2394.

Nail Pull Resistance: 125 lbs. minimum per ASTM C 473.

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

Floor Tile Installation System Rating: Residential per ASTM C627

Underlayment: DUROCK Underlayment.

Thickness: 5/16".

Size: 4 feet x 4 feet

Edges: Formed smooth edges; square cut ends.

Floor Tile Installation System Rating: Residential per ASTM C627

Joint Reinforcement: DUROCK glass-fiber tape, vinyl coated,

open-weave tape; 2 inches wide; pressure-sensitive.

Gypsum Board Base Layer: 1/2 inch SHEETROCK Brand FIRECODE "C"

gypsum panels.

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RETAIN ABOVE OR BELOW IF REQUIRED FOR SPECIFIED FIRE RATED

ASSEMBLY; EDIT AS REQUIRED.

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Gypsum Board Base Layer: Specified in Division 9 Section "Gypsum

Drywall". Provide type required by specified performance

requirements.

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NAILS AND STAPLES ARE FASTENER OPTIONS AT WOOD FRAMING IN NON-

FIRE RATED ASSEMBLIES.

CONSULT CURRENT PRODUCT LITERATURE FOR MORE INFORMATION.

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Fasteners: Self-drilling screws with corrosion resistant finish.

At Tile Backer Board: DUROCK screws with flat wafer head capable

of being driven flush to surface of tile backer board; 1- 1/4

inch long.

When tile backer board is installed over gypsum board base layer,

screws shall be 1-5/8 inches long.

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RETAIN ABOVE AND BELOW IF GYPSUM BOARD BASE LAYER IS SPECIFIED IN

THIS SECTION.

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At Gypsum Board: USG bugle head drywall screws, 1 inch long.

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RETAIN BELOW IF RATED CONSTRUCTION IS REQUIRED.

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Acoustical Sealant: SHEETROCK Brand Acoustical Sealant. Sealant

shall be type used in sound attenuation and fire resistance tests

and shall remain resilient for life of installation.

Sound Insulation: THERMAFIBER Sound Attenuation Fire Blankets

(SAFB); unfaced, semi-rigid spun mineral fiber mat, 2.5 pcf

minimum density, 2000 deg F meltpoint; 16 inches x 48 inches x

thickness indicated; ASTM C 665, Type 1.

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RETAIN ABOVE OR BELOW IF RATED CONSTRUCTION IS REQUIRED.

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Sound Insulation: THERMAFIBER Sound Attenuation Fire Blankets

(SAFB) as specified in Division 9 Section "Gypsum Drywall".

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RETAIN BELOW IF REQUIRED. MODIFY IF VAPOR RETARDER OR

WATERPROOFING IS REQUIRED.

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Water Barrier: Vapor permeable membrane, 15 lb. asphalt felt or

TYVEK building paper by E.I. du Pont de Nemours & Company.

Tile Setting Materials:

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SEE USG PRODUCT LITERATURE FOR TILE SETTING MATERIAL SELECTION

INFORMATION. EDIT LISTING TO SUIT PROJECT.

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Organic Adhesives: ANSI A136.1, Type I. Provide one of

following:

DUROCK Ceramic Tile Mastic.

DURABOND D-2001 Multi-Purpose Ceramic Tile Mastic.

DURABOND D-67 Multi Purpose Ceramic Tile Mastic.

Dry-set Mortar: ANSI A118.1. Provide one of following:

DURABOND D-50 Sanded Ceramic Tile Thin-Set Mortar mixed with

DURABOND D-L16 Acrylic Latex Additive.

Latex-Portland Cement Mortar: ANSI A118.4. Provide one of the

following:

DURABOND D-30 Marble and Granite Mortar.

DUROCK Latex Fortified Mortar.

DURABOND D-40 Latex Fortified Mortar.

Modified Epoxy Emulsion Mortar: ANSI A118.8; DURABOND D-L19

CERAMIPOXY Tile Setting Mortar.

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SEE USG PRODUCT LITERATURE FOR GROUT SELECTION INFORMATION. EDIT

LISTING BELOW TO SUIT PROJECT.

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Grout: Provide in colors selected by Architect/Engineer from

manufacturer's standard colors.

Dry-Set Grout: ANSI A118.6; DURABOND C-150 Commercial Dri-Set

Grout mixed with D-L26 Acrylic Latex Grout Additive or DUROCK LFG

250 Latex Fortified Grout.

Acid Resistant Colored Floor Grout: ANSI A118.6; DURABOND AR-20

Acid Resistant Colored Floor Grout mixed with D-L26 Acrylic Latex

Grout Additive.

Finishes for Un-Tiled Surfaces:

Tile Backer Board Sealer: DUROCK or DURABOND, Type I Adhesive,

thin four parts adhesive with one part water.

Joint Tape: SHEETROCK Brand reinforcing tape.

Joint Compound: SHEETROCK Setting type or Lightweight Setting

Type Joint Compound.

Finishing Compound: SHEETROCK Ready-Mixed Joint Compound or

SHEETROCK Lightweight All Purpose Joint Compound Ready-Mixed.

Corner Bead: USG DUR-A-BEAD No. 103 or No. 800, galvanized steel

corner reinforcement, 1-1/4 inches x 1-1/4 inches.

PART 3 - EXECUTION

EXAMINATION

Examine substrates and framing for compliance with requirements

and conditions affecting work of this Section. Do not proceed

with installation until piping, waterproofing, and other in-wall

work has been installed and accepted by Architect/Engineer and

unsatisfactory conditions have been corrected.

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RETAIN BELOW FOR SOUND RATED PARTITIONS.

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Examine adjacent construction for conditions which could

contribute to loss of sound attenuation.

GENERAL

Comply with manufacturer's printed installation instructions

applicable to products and applications indicated, except when

more stringent requirements apply.

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RETAIN BELOW IF RATED CONSTRUCTION IS REQUIRED.

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Conform to construction requirements of tested assemblies used to

demonstrate required sound attenuation and fire resistance.

Before installation, cut tile backer boards to required sizes,

make necessary cut-outs for penetrations, and grind or drill to

provide relief at bolts and screw heads which project beyond face

of substrate.

Control Joints: Do not install tile backer board continuously

through building movement and control joints or where control

joints are required in ceramic tile.

Sound Insulation: Fiction fit insulation blankets between

framing. Butt blanket ends and fill all voids.

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RETAIN ABOVE OR BELOW IF REQUIRED FOR RATED CONSTRUCTION.

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Sound Insulation: Install as specified in Division 9 Section

"Gypsum Drywall".

Acoustical Sealant: Completely seal around perimeter of and

penetrations through sound rated partitions.

FLOORS AND COUNTERTOPS

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COORDINATE DIVISION 6 SPECIFICATIONS FOR SUBFLOOR AND COUNTERTOP

BASE WITH REQUIREMENTS IN DUROCK PRODUCT LITERATURE.

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Floors and Countertops: Laminate DUROCK Underlayment to 5/8"

minimum exterior grade plywood base using ceramic tile mastic,

latex fortified mortar or thin-set mortar mixed with acrylic

latex additive applied to subloor with 1/4" square-notched trowel

for thin-set, 5/32" V-notched trowel for mastic. Place

underlayment with joints staggered from subfloor joints. Fit

ends and edges closely but not forced together. Fasten to

subfloor with 1-1/4" DUROCK Wood Screws or 1-1/2" galvanized

roofing nails spaced 8" o.c. in both directions with perimeter

fasteners at least 3/8" and less than 5/8" from ends and edges;

or with 1/4"x7/8" galvanized staples spaced 4" o.c. in both

directions. Prefill joints with tile-setting mortar or adhesive

and then immediately embed tape and level joints; or apply DUROCK

Interior Tape over the joints and then apply tile-setting mortar

or adhesive, forcing it through the tape to completely fill and

level the joints.

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EDIT ABOVE TO MATCH PRODUCT TYPES SELECTED.

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PARTITIONS AND CEILINGS

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EDIT BELOW AS REQUIRED.

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Framing: Install over framing type indicated on drawings.

Install blocking to support tub and other plumbing fixtures, and

to receive soap dishes, grab bars, towel racks and other

accessories and hardware.

At shower receptors, fur out studs, if necessary, so inside face

of receptor is flush with exposed face of tile backer board.

Gypsum Board Base Layer: Install base layer; screw to framing 24

inches o.c.

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RETAIN ABOVE OR BELOW IF REQUIRED FOR RATED CONSTRUCTION.

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Gypsum Board Base Layer: Install base layer as specified in

Division 9 Section "Gypsum Drywall".

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EDIT OR DELETE BELOW AS REQUIRED.

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Water Barrier: Install over gypsum board base layer at tubs,

showers, and other wet areas and where indicated. Lap joints to

shed water towards face of partition. Bottom edge shall overhang

lip of tub, shower pan, or shower receptor.

Apply tile backer boards to framing with long dimension parallel

to or across framing. Fit ends and edges closely but not forced

together. Center end or edge joints on framing and stagger

joints in adjacent rows.

At tub, shower pan, or shower receptor, place temporary 1/4 inch

spacer strips around lip of fixture. Install board abutting top

of spacer. Remove spacer before installing tile. Joint sealants

are specified in another section.

Fasten tile backer board to framing. Locate screws at least 3/8

inch from edge of board and as follows:

Walls - Wood Framing: 8 inches o.c.

Walls - Steel Framing 20 to 14-Gage: 8 inches o.c.

Ceiling: 6 inches o.c.

JOINT TREATMENT

Tiled Surfaces: Apply joint reinforcing over joints and corners.

Embed with mortar or adhesive used to set tile.

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LIMIT UN-TILED SURFACES TO SMALL AREAS, SUCH AS FROM TOP OF TILED

TUB SURROUND TO CEILING.

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Un-Tiled Exposed or Painted Surfaces: Install tile backer board

with smooth side exposed. Seal tile backer board with tile

backer board sealer. Apply tape over joints. Embed joint tape

and treat fasteners with joint compound. Flat trowel a skim coat

of joint compound over tile backer board to fill voids. Sand to

provide a smooth surface except where a textured finish is

indicated. Finish joints with at least two coats of finishing

compound. Install corner beads at outside corners.

TILE INSTALLATION

Install tile in accordance with instruction of manufacturer of

tile backer board and tile setting and grouting materials. Comply

with the following standards:

Organic Adhesives: ANSI A136.1.

Dry-Set Adhesives: ANSI A108.5.

Latex Portland Cement Mortar: ANSI A108.5.

Grout: ANSI A108.10.

Provide tile patterns, trim, accessories, expansion and control

joints, sealants, and other accessories as specified in Division

9 Section "Tile".

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IF TILE INSTALLATION IS SPECIFIED IN THIS SECTION, RETAIN

PARAGRAPHS ABOVE AND MODIFY AS REQUIRED. IF TILE INSTALLATION IS

SPECIFIED IN ANOTHER SECTION, RETAIN BELOW.

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Install tile as specified in another Section. Install with

setting materials and grouts acceptable to tile backer board

manufacturer to assure compatibility with substrate.

END OF SECTION 09390

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A limited license is extended to qualified design professionals

to duplicate and print this guide specification for the purpose

of incorporating products manufactured by U.S. Gypsum Co. into a

construction specification or purchase order.

Notice: We 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

current 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.

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