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l` Cement Board Systems
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OUROCK® DUROCK cement board offers architects, builders and file contractors a strong, water -durable file base for
Cement Board tub and shower areas. Also an ideal underlayment for file 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 latex -fortified mortar or Type I organic adhesive.
DUROCK cement board is preferred by many applicators as a base for directly applied finishes, tile, stone and
thin -brick used in building exteriors.
DUROcK'M Corrosion -resistant; 8-gauge; wafer heads with countersinking ribs to prevent strip -out; self -drilling points. DuRocK
Tile Backer Screws tile backer screws for wood framing come in three lengths: 1-1 /4",1-5/8" and 2-1/4". DUROCK the backer screws
for steel framing can be used with steel framing where steel thickness is from 14 to 20-gauge; they come in two
lengths: 1-1/4" and 1-5/8". Both wood and steel screws have heads a minimum of 0.40" in diameter; their driving
recess is a No. 2 "Phillips" design.
OUROCe' Alkali -resistant glass -fiber tape reinforces joints to provide a strong, continuous surface. Each roll 2" x 50',
Tile Backer Tape 2" x 150', 2" x 250' or 4" x 150'.
Features and Dual Surface Although both sides of DUROCK cement board.are suitable for either mastic or thin -set mortar applications,
Benefits of the following is offered as a guide:
DUROCK — Smooth side for mastic applications; increases adhesive coverage
Cement Board — Textured surface enhances bonding, reduces tile slip with mortar applications
Dimensional — Low thermal and hygrometric expansion helps prevent cracking
Stability Will not swell, soften, decay, delaminate or disintegrate in water
Fire -Resistance — Noncombustible panel
— Assemblies with 1/2" DUROCK cement board have achieved 1- and 2-hour fire -resistance ratings
Light weight — At approximately 2.4 psf, the 1 /2" thick board is approximately 25% lighter than other cement boards
Easy installation — Easy to cut and fasten
— Installs up to 20% faster than other cement boards
Convenient Sizes — May be ordered in sizes to meet job requirements (see table of sizes and packaging)
Versatility — Provides a smooth, sound base for glass and ceramic mosaics; ceramic and quarry tile; lugged tile; thin
stone tile; and thin brick
— Adaptable for fences, fireplace fronts, mobile home skirting, agricultural buildings, garage wainscoting
and various exterior synthetic stucco systems.
Limitations 1. Designed for positive or negative uniform loads up to 60 psf. For complete information on the use of DUROCK
panels in exterior systems, consult uniform load table on page 3 for applicable positive or negative uniform loads
on wall systems.
2. Wall applications: Maximum stud spacing:16" o.c. (24" o.c. for cavity shaft wall assembly). Framing shall be
designed (based on stud properties alone) not to exceed U360 deflection for tile and thin brick, U240 for
direct -applied exterior finish systems. Maximum fastener spacing: 8" o.c. for wood and steel framing; 6" o.c.
for ceiling applications.
3. Floor applications: Maximum joist spacing 24" o.c. The subfloor system should be designed with a minimum
deflection limit of U360 for the span. Some finish materials may require a more rigid sub -assembly (such as large
format tile and natural stone products). In these cases, follow the manufacturer's minimum requirements.
The subfloor should be APA Span -Rated Plywood or OSB with an Exposure 1 classification or better with tongue
and groove or back blocked at the unsupported edges.
4. Maximum dead load for ceiling system is 7.5 psf.
5. Steel framing must be 20-gauge equivalent or heavier.
6. Do not use drywall screws or drywall nails. Do not use drywall joint tape.
7. Do not use 1 /4" DUROCK cement board for wall or ceiling applications.
8. Do not use DUROCK cement board with vinyl flooring. _,": M, r.)
g? .'9. DUROCK cement board is not designed for use as a str I 'a I.l
United States Gypsum Company SA932 2