USG FIBEROCK Interior Panels Abuse-Resistant - Manual (Page 2)

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 Љ 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
Љ deep formed
by crowned face of hammer. Drive nails no closer than 3/8
Љ from edges and ends of panel.
Interior Joint 1. Mix joint compound in accordance with manufacturer’s recommendation. Use S HEETROCK Brand D URABOND
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 S HEETROCK
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 tap-
ing compound at all tapered angles and provide a true angle. Where necessary, sand lightly between coats and fol-
lowing 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.
S HEETROCK Brand T UFF -H IDE ™ Treat all joints, fasteners and accessories with a recommended S HEETROCK ® 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 T UFF -H IDE 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 S HEETROCK Brand Joint Tape and S HEETROCK Brand Setting-Type Joint Compound
(Optional) (D URABOND or E ASY S AND ). 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 Љ to 3/32Љ 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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