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 Hamilton Drywall
Products is proud to introduce Prep Coat Plus "Level 5" as our newest addition to
our paint line. Click here for more information! |
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| Delamination of
texture on drywall surfaces is an expensive and apparently increasing problem. Job site
investigation of this problem reveals not one cause, but
several. Read more >>> |
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| Finishing and Texturing Gypsum Drywall Walls and Ceilings |
| Unless otherwise indicated,
all walls, partitions and ceilings on which gypsum wallboard has been applied, are included. The
levels of finish on these surfaces have been defined in accord with "Recommended Levels of Gypsum
Board Finish" (GA-214). Contractor is to furnish all labor and material necessary to produce a
smooth, monolithic surface suitable for application of the specified decorative
finish. (See Finish Schedule) |
| 1.1 Reinforce and conceal
all joints between gypsum wallboard panels. |
| 1.2 All corner reinforcement
(cornerbead; metal, or other) is to be finished to a smooth, even plane, using only those compounds
recommended for that purpose by the manufacturer. |
| 1.3 All exposed fastener
heads are to be concealed and finished smooth. |
| 2.1 No materials shall be
applied until a minimum temperature of 50° F has been maintained for a period of at least 48
hours in the working area and the surface moisture has been stabilized (dry). The same conditions
shall be maintained during the complete finishing operation and until all materials are completely
dry and stable. Provide adequate ventilation to insure proper drying, setting, or curing
conditions. |
| 3.1 All finishing materials
shall be the products of Hamilton Drywall Products. (See Hamilton Finishing System Selector
Guide) |
| 3.2 Materials to be delivered
to job site in original, unopened containers, and stored in a location protected from weather and
tampering. |
| 4.1 Mixing and/or thinning
of joint compounds shall be done in accordance with Hamilton’s recommendations, which appear on
each container. Intermixing of chemically hardening and drying materials is not recommended. |
4.2 Reinforcement of field
and interior angle joints shall be accomplished by embedding drywall tape directly over the joint
in a coat of the recommended joint cement (or taping system) approximately three inches in width.
The tape should be firmly seated in the joint cement, wiped smooth, and excess joint cement removed.
(Sufficient cement is to be applied to insure proper bond of the tape and fill the wallboard
recess.)
Note: In
all operations, allow each coat of joint cement to dry thoroughly before applying subsequent coats. |
| 4.3 Second, or skim coat,
to be applied to a width of approximately seven inches, centered over the joint, and drawn to a
smooth, even plane with the wall board surface. |
| 4.4 If required, a
third coat shall be applied to a width of approximately ten to twelve inches, centered over
the joint, and drawn to a smooth, even plane. |
| 4.5 Fastener heads
shall be covered with at least two coats of joint cement allowing sufficient drying time
between coats. |
4.6 All cut-outs
around pipes, vents, receptacles, etc., shall be back filled with joint cement and when necessary,
reinforced with joint tape.
Note: Special
treatment is sometimes required on fire resistive wall/ceiling assemblies. Consult the uniform
Building Code or responsible agency for requirements. |
| 4.7 All corner
reinforcing, as well as exposed flanges of trim, shall be concealed with at least two coats
of the recommended joint cements and finished smooth. |
| 4.8 Where necessary,
the dried joint cement surfaces may be lightly sanded to insure a smooth surface. Care should
be taken not to raise the nap of the wall board face paper. All sanding dust is to be
removed. Approved protective respirators should
be worn while mixing powder or sanding. Sponging is recommended where practical. |
| 4.9 For wall or ceiling
surfaces to be finished with gloss paints, or subject to severe lighting conditions, a thin skim
coat of joint cement or Hamilton's Prep Coat Plus shall be applied to the entire surface of the
board. This is particularly important on smooth, untextured surfaces. (See Level of Finish) |
| 5.1 Surfaces to receive
texture should be treated to minimize variances between joints and field of board. Hamilton's Prep
Coat Plus is recommended for that purpose. If water-soluble contaminants are suspected on the
substrate, the application of a sealer is recommended to prevent discoloration. |
| 5.2 Samples of texture
pattern and coverage to be submitted for architectural approval prior to application. |
| 5.3 Masking
(optional) – All door frames, windows, and window frames are to be masked prior to
application of textures. |
| 5.4 Clean-up
(optional) – Remove masking from area not to receive texture. Floors are to be scraped
and left broom clean. |
| 6.1 Acceptability
of surfaces for decoration and proper application of those decorative products are the
responsibility of the appropriate contractor (paint, wall covering, etc.) |
| Note:
Method of application of paint products can
be critical. Roller application has proven to be the most satisfactory over drywall
surfaces. |
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