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Cutting Panels – Cut ends, edges, scribe,and make cutouts within fields of panels in a workmanlike manner.Panels should be
cut to size utilizing a knife and straight edge. A power saw should be used only if it is equipped with a dustcollection device. Panels may be cut by scoring and snapping, or by sawing,working from the face side.
A S
NAPPER SHEAR
®
tool specifically designed for FIBEROCK
Brand Panels may also be used.
– When using the score-and-snap method, score the panel twice and snap the panel away from the cut face.
The backside of the panel is then broken by snapping the panel in the reverse direction.
– If a power-operated saw is used, a low-RPM,3-1/2 (89 mm) carbide-blade, portable saw is recommended.
– Where necessary to obtain neatly fitting joints, a rasp or surform should be used to smooth cut edges.
– Holes for pipes, fixtures, and other small openings can be cut out with a saw or a drywall router equipped with a
1/4 carbide bit.When using a router, panels should be held away from the wall to avoid damage to utility boxes.
Basic Single-Layer System 1. Position all ends and edges of all gypsum fiber panels over framing members, except when joints are at right
Treated Joints angles to framing members, as in perpendicular application or when end joints are back-blocked.
2. Apply gypsum fiber panels first to the ceiling, then to the walls. Install panels vertically whenever possible.For horizon-
tal panel application, panels must be gapped 1/16" of an inch. End joints should be loosely fit.Install panels a minimum
of 3/8" above the floor.To minimize end joints,use panels of maximum practical lengths. Stagger end joints in successive courses with joints on opposite sides of a partition placed on different studs.
3. Attach panels to framing supports by: (Standard Single Nailing Method) (Double Nailing Method) (Power-Driven
Screws). Space fasteners not less than 3/8 from edges and ends of panels and drive as recommended for
specified fastening method. Drive fasteners in field of panels first, working toward ends and edges.Hold panel
in firm contact with framing while driving fasteners. Drive fastener heads slightly below surface of gypsum fiber
panels in a uniform dimple.
4. For non-fire-rated partition designs, refer to the table below for fastener spacing. For UL fire-rated partition
designs, refer to the specific UL design for proper fastener spacing.
Fastener Spacing
Ceilings Thickness Application Frame Spacing Nails Screws
(Wood- or
1/2 parallel 16 o.c. 7 o.c. 12 o.c.
or Steel
perpendicular 16 o.c. 7 o.c. 12 o.c.
Framed)
5/8 parallel 16 o.c. 7 o.c. 12 o.c.
perpendicular 24 o.c. 7 o.c. 12 o.c.
Fastener Spacing
Walls Thickness Frame Spacing* Nails Screws
1/2 —24 o.c. 8 o.c. 12 o.c.
16 o.c. 8 o.c. 16 o.c.
5/8 —24 o.c. 8 o.c. 12 o.c.
16 o.c. 8 o.c. 16 o.c.
*16 o.c recommended for abuse-resistant applications.
5. Install trim at all internal and external angles formed by the intersection of either panel surfaces or other
surfaces. Apply metal or paper-faced corner bead to all vertical or horizontal external corners in accordance
with manufacturer’s directions.
Control Joint Attach Zinc Control Joint No. 093 with Bostitch 9/16 “G” staples or equivalent spaced not over 6 apart in each
Installation flange. Cut end joints square and align for neat fit. Remove protective tape when joint treatment is completed.
Break panel behind joint and back by double framing members (spaced 1/2 apart).
FIBEROCK
®
Brand
Interior Panels
Application Tips
Abuse-Resistant
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Fastener Drywall Screws Power-drive with an electric screw gun so screwheads provide a slight depression below surface of gypsum
Application fiber panels. Do not drive screws closer than 3/8 from edges and ends of gypsum fiber panels.
Nails Drive nails with heads slightly below gypsum fiber panel surface in a uniform dimple 1/32 deep formed
by crowned face of hammer.Drive nails no closer than 3/8 from edges and ends of panel.
Interior Joint 1. Mix joint compound in accordance with manufacturer’s recommendation.Use SHEETROCK Brand DURABOND
System Application Setting-Type Joint Compound for the embedment of the S
HEETROCK Brand Joint Tape. Standard ready-mixed
compounds (non-lightweight) can be used for the balance of finishing.
2. Apply joint compound in a thin uniform layer to all joints and angles to be reinforced. Immediately apply SHEETROCK
Brand Joint Tape centered over joint and seated into compound. Sufficient compound must remain under the tape
to provide proper bond. Follow immediately with a thin skim coat to embed tape, but not to function as a second coat.
Fold and embed tape properly in all interior angles to provide a true angle. The tape or embedding coat must
be hardened prior to application of second coat.
Note: Do not use fiberglass tape.
3. Apply second coat of joint compound over embedding coat, filling panel taper flush with surface; cover tape and
feather beyond first coat. On joints with no taper, cover the tape and feather on either side of tape. Allow second
coat to harden prior to application of finish coat.
4. Spread finish coat evenly over and extend beyond second coat on all joints and feather to a smooth uniform
finish. Do not allow finished joint to protrude beyond plane of the surface.Apply a finish coat to cover tape and taping compound at all tapered angles and provide a true angle. Where necessary, sand lightly between coats and following the final application of compound to provide a smooth surface ready for decoration.
Finishing Fasteners Apply joint compound to all fastener depressions.
Finishing Bead and Trim 1. Apply first coat to all bead and trim and properly feather out from ground to plane of surface. Compound must
harden prior to application of second coat.
2. Apply second coat in same manner as first coat, extending compound slightly beyond first coat, and properly
feathering from ground to plane or surface. When dry, sand finish as necessary to provide a flat smooth surface
ready for decoration. When sanding,take care not to roughen surface.
SHEETROCK Brand TUFF-HIDE
™
Treat all joints, fasteners and accessories with a recommended SHEETROCK®Brand joint treatment system.
Primer- Surfacer,(Optional) A minimum Level 4 wallboard finish is recommended (refer to Gypsum Association publication GA-214,
“Recommended Levels of Gypsum Board Finish” or ASTM C-840 equivalent for a detailed description.) Apply
a uniform coat of S
HEETROCK Brand TUFF-HIDE Primer-Surfacer to entire surface using approved airless spray
equipment to a minimum wet film thickness (WFT) of 15 mils. On all applications,a WFT in excess of 20 mils is
not recommended. Use a WFT gauge to ensure proper application and maximum performance. Refer to USG
publications J1613 and J1691 for complete recommendations.
Veneer Plaster Joints should be treated with SHEETROCK Brand Joint Tape and SHEETROCK Brand Setting-Type Joint Compound
(Optional) (D
URABOND or EASY SAND). Joint surfaces must be treated with a separate coat of joint compound to fully conceal
the paper tape. When the joint is completely dry, treat entire wall surface with USG plaster bonder according to
application directions. Then apply D
IAMOND
®
Brand Veneer Basecoat Plaster from 1/16 to 3/32 thickness using
a scratch and double-back technique. This is accomplished by applying a tight,thin coat over the entire area, and
immediately doubling back with plaster from the same batch to achieve full thickness. When basecoat plaster is
firm, broom the surface to leave it rough and open for finish.With basecoat set and partially dry, apply I
MPERIAL
®
Brand Finish Plaster using a scratch and double-back technique. Complete finishing when material is firm.
Leave finished surface smooth and dense for decorating. Refer to USG System Folder SA920 for complete plaster
recommendations.
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Ceramic Tile FIBEROCK
Brand Abuse-Resistant Panels are acceptable for use as a ceramic tile backer in dry areas only.
Applications Refer to the TCA Handbook designs W221,W222, W223, W242 and W243 for specific system and finishing
requirements.
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SAFETY FIRST!
Follow good safety practices.
Read material safety data
sheets and related literature on
products before specification
and/or installation.
Trademarks
The following trademarks used
herein are owned by United
States Gypsum Company:
D
IAMOND,DURABOND,EASY SAND,
F
IBEROCK,IMPERIAL,SHEETROCK,
T
UFF-HIDE.THERMAFIBER is a
trademark of Thermafiber LLC.
S
NAPPER SHEAR is a trademark of
Pacific International Tool & Shear.
Note
Products described here may
not be available in all geographic markets. Consult your
U.S. Gypsum Company sales
office or representative for information.
Notice
We shall not be liable for incidental or 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 their 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
the date it was or reasonably
should have been discovered.
Manufactured by
United States Gypsum Company
125 South Franklin Street
Chicago, IL 60606
800 USG.4YOU (874-4968)
www.usg.com
F253/2-04
©2004, United States Gypsum Company
Printed in U.S.A.
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