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USG DUROCK BRAND CEMENT BOARD SYSTEMS usg.com IT’S YOUR WORLD. BUILD IT.1

USG DUROCK® BRAND CEMENT BOARD SYSTEMS USG DUROCK® BRAND CEMENT BOARD USG Durock® Brand Cement Board offers architects, builders and tile contractors a strong, water-durable tile base for tub and shower areas. Also an ideal underlayment for tile on floors and countertops in new construction and remodeling. Board is readily applied over wood or steel framing spaced 16" o.c. with corrosion-resistant wood or steel screws or hot-dipped galvanized roofing nails. After joints are treated, ceramic wall or floor tile is applied using latexfortified mortar or Type I organic adhesive. USG Durock®...

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LIMITATIONS CONT. 8. Do not use drywall screws or drywall nails. Do not use drywall joint tape. 9. Do not use 1/4" USG Durock® cement board for wall or ceiling applications. 10. Do not use USG Durock® cement board with vinyl flooring. 11. USG Durock® cement board is not designed for use as a structural panel. 12. Maximum installed weight of the finish system should not exceed 15 psf. 13. USG Durock® cement board panels should not be used in areas where they are exposed to temperatures that exceed 200°F. 14. In locations close to salt water or other challenging environments, design...

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PARTITIONS USG Durock® cement board exceeds ANSI standards for cementitious backer units (CBU). See ANSI A118.9 for test methods and specifications for CBU and ANSI A108.11 for interior installation of CBU. Exceeds industry standards as an exterior substrate for exterior finishes. Exceeds ASTM C1325 standards for nonasbestos fiber-mat reinforced cementitious backer units. One-Hour Fire-Rated Construction Two-Hour Fire-Rated Construction ROOF/CEILINGS One-Hour Fire-Rated Construction

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Two-Hour Fire-Rated Construction Dimensional Lumber, Wood Framed Construction Detail Description • Two layers 5/8” USG Sheetrock® Brand Firecode® C gypsum panels - 8” x 8” ceramic tile • 1/2" USG Durock® Brand cement board • 1" USG Sheetrock® Brand gypsum liner panels - 1/2" plywood - 2 x 10 wood joist 16" o.c. - 3" mineral wool batt Test Number One-Hour Fire-Rated Construction Wood Framed, Load-Bearing Acoustical Performance Notes: USG Durock® Brand cement board, 5/8" thick, may be substituted for 1/2" cement board panels in all assemblies listed above. USG Fiberock® 5/8" thick or USG...

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Floors, interior—wood or steel joists Type I organic adhesive or latex-fortiﬁed mortar liquid or sheet membrane USG DurockTM Brand tile backer tape USG Durock® Brand cement board or underlayment Type I organic adhesive or latex-fortiﬁed mortar padding carpet wood or steel joists 3/4" USG Durock® Brand cement board or underlayment Note: For bonding cement backerboard to plywood subﬂoor, use Type 1 organic adhesive or latex-fortiﬁed mortar that is suitable for this kind of application. For application of various types of tiles to cement backerboard on ﬂoors or countertops, contact the tile...

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Typical bathtub installation Fixture attachment—steel framing 3/8" Type S-12 pan head screw Use USG Sheetrock® Brand joint treatment system and sealer for ﬁnishing USG Durock® Brand cement board to USG Sheetrock® Brand gypsum panel (Refer to 3.7B) in painted areas 1/2" USG Sheetrock® Brand gypsum panel steel runner 1/2" USG Durock® Brand cement board 32" x 5'-0" USG Durock® Brand cement board 32" x 5'-0" USG DurockTM Brand tile backer screws for wood framing 8" o.c. support framing for attachment of ﬁxtures ceramic tile USG DurockTM Brand tile backer tape Type I organic adhesive or...

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GOOD DESIGN PRACTICES Systems covered herein have been tested and evaluated for use as described. For other system applications, consult your local representative. All details, specifications and data contained in this literature are intended as a general guide for using USG Durock® cement board systems. These products must not be used in a design or construction of any given structure without complete and detailed evaluation by a qualified structural engineer or architect to verify suitability of a particular product for use in the structure. Information in this publication should be used...

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9. Smooth Side/Rough Side USG Durock® cement board has a smooth side and a rough side. Although both sides of USG Durock® cement board are suitable for either mastic or thin-set mortar applications, as a general guide, use the smooth side for mastic applications and the rough side for mortar applications. 10. Shadowing and Spotting When the outside temperature differs considerably from the building's interior temperature, airborne dirt can accumulate on the colder regions of walls, causing “shadowing” or “spotting,” particularly over fasteners and framing. This is a natural phenomenon that...

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Steel or wood wall framing to receive USG Durock® cement board panels shall be structurally sound, free from bow and in general compliance with local building code requirements. Damaged and excessively bowed studs shall be replaced before installation of USG Durock® cement board panels. Framing shall be designed (based on stud properties alone) not to exceed L/360 deflection for tile and thin brick, L/240 for Direct-Applied Exterior Finish Systems. Steel framing must be 20-gauge equivalent or heavier with corrosion-resistant metal coating equivalent to G60 hot-dipped galvanized. Exterior...

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C Shaft Wall—Attach USG Durock® cement board over base layer of gypsum panels with 1-5/8" USG Durock™ tile backer screws for steel framing at 8" o.c. to studs. Since studs are at 24" o.c., laminate cement board to base layer of gypsum panels with a 4" wide strip of construction adhesive between studs. Apply adhesive with a 1/4" squarenotched trowel. D Exterior Walls—Attach USG Durock® cement board with corrosion-resistant screws spaced a maximum of 8" o.c. over framing spaced a maximum of 16" o.c. Apply a weather-resistive barrier and flashing behind the panels as required. Follow the...

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