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Main FeaturesDiamond® Veneer Finish is formulated for hand application over Imperial® Gypsum Base or as a finish of a two-coat system over a sanded gypsum basecoat, Imperial® Basecoat Plaster or Diamond® Veneer Basecoat Plaster.
Data/Submittal Sheets & Specifications
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What is the recommended stud spacing for installing conventional plaster?
Do not exceed 16 inches on center.
When using the USG Decorative Interior Finishing System (DIFS), how many different textures can be achieved?
There are many textures available however semi-smooth, medium and heavy are standard examples.
Can conventional 3-coat plaster be used with drywall grid?
Yes. If the main tees, cross tees and hanger wires are properly sized and spaced to carry the plaster load and only Red Top®; Structo-base® gypsum basecoat plaster is used for the scratch and brown coats.
Can USG Veneer Plaster be applied directly over CMU?
The CMU must cure for at least 45 to 60 days prior to the plaster application. Refer to USG system folder SA920 for specific application directions.
How is the USG Decorative Interior Finishing System (DIFS) applied?
It is recommended that the sealer be applied using low-pressure airless spray equipment.
When can veneer plaster be painted?
Veneer plaster can be painted when it is completely dry. The best way to determine if the plaster is dry is by taping a piece of 12" by 12" plastic to the surface. If any moisture remains on the plastic after 24 hours then the plaster is not completely dry.
How should the Color Trend colorant and water be mixed?
Mix Color Trend and water together in a bucket using a heavy-duty 450-RPM drill with a drywall blade-type joint compound paddle. Turn the drill on and off several times to evenly disperse the colorant through the water and to prevent splashing.
When using Diamond® Veneer Finish, does it matter if some of the colorant is spilled or splashed out during mixing?
Yes. Any loss of the colorant causes color variation in the finished material.
What are the only base coat plasters that can be used as the scratch and brown coat for a conventional 3-coat application over wide-flange (1 inch or greater) framing?
USG has three products that can be used: Red Top® Gypsum Plaster, Red Top® Wood-Fiber Gypsum and USG® Structo-Base® Gypsum Plaster.
Can plaster be used for grouting doorframes?
Yes, but only on open throat doorframes, per door manufactures requirements. Red Top® Gypsum Plaster mixed with sand is most commonly used for full grouts. (Recommendation: 1-part Red Top Gypsum/ 2-parts sand per bag)
See the Gypsum Construction Handbook for full details.
How long should USG Decorative Interior Finishing System (DIFS) dry before applying sealer?
Sealer can only be applied after the surface has dried (usually about 24 hours depending on the humidity and temperature at the job site).
What components make up USG Decorative Interior Finishing System (DIFS)?
First Coat Primer, Plaster Bonder-clear, any USG veneer plaster, Colortrend colorants, and a choice of either Semi-Gloss or Low Luster Sealer.
When can a conventional plaster system be painted?
A conventional plaster system can be painted after it is completely dry.
What is the shelf life of plaster?
Plaster can be stored 3-6 months if it is stored in a cool, dry place, protected from extreme heat and cold, direct sunlight and at a temperature above 45°F (7°C).
What is the best way of repairing an old wood lath plaster application?
Remove the old plaster down to the wood lath, staple metal over the existing lath and apply Red Top® sanded conventional basecoat over the metal lath. Any USG finish plaster can be applied over the basecoat plaster for a final coat.
Why must a color be picked that is darker than the actual color wanted?
A color darker than the desired result must be selected to compensate for the color change that occurs when the plaster is applied and dries.
What paints are recommended for decorating veneer plaster?
Consult paint manufacture for proper primer selection for both lime-containing finish plasters, such as Diamond® Veneer Finish; or non-lime-containing finish plasters such as Imperial® Veneer Finish. See literature piece PM15 for Preperation for Painting details.
What steps are taken before applying USG Decorative Interior Finishing System (DIFS) over existing sound, clean, bondable, monolithic substrate?
Before applying the plaster to any substrate it must be identified as clean and bondable. Plaster bonder-clear is then applied to the entire surface. Once the plaster bonder is dry to the touch, apply the colored finish. When that is dry, seal with a Low-luster or semi Gloss sealer.
Can Veneer Plaster be applied to sun-faded USG Imperial® Brand Gypsum Base?
No. An alum spray must be applied prior to application.
Can I store USG Decorative Interior Finishing System (DIFS) products outdoors?
As with all gypsum products, DIFS products must be protected from exposure to excessive or continuous moisture and the elements before, during and after installation. Storing outdoors uncovered is not recommended.
What are the deflection design criteria for installing plaster systems?
When installing a veneer plaster system it should be designed at deflection L/240 and L/360 for a Conventional Plaster system.
What is the best way to prevent color variation in the USG Decorative Interior Finishing System (DIFS)?
To prevent color variation in the USG Decorative Interior Finishing System, make sure that the area you are plastering is free of direct airflow to prevent against dry-out and that the minimum thickness of plaster applied is 1/8 of an inch.
What substrates can USG Decorative Interior Finishing System (DIFS) be applied over?
Properly prepared drywall surfaces, basecoat plaster, and existing surfaces that have been identified as sound and bondable.
What is the difference between USG Imperial® Veneer Finish Plaster and USG Diamond® Veneer Finish Plaster?
USG Imperial® Veneer Finish Plaster is stronger and more abrasion resistant.
USG Diamond® Veneer Finish Plaster is designed for ease of use and slightly improved abrasion resistance when compared to gypsum panels.
What is the recommended spacing of control joints for a plaster system?
Control joints are not to exceed 30 feet for walls and ceilings. The spacing for a ceiling with perimeter relief is not to exceed 50 feet.
Can USG Red Top® Brand Finish Plaster be applied over Veneer Basecoats?
Yes. Mill-mixed USG Red Top® Brand Finish Plaster or other job-site lime/gauging plasters can be applied over Veneer Basecoats.
What if the sealer starts to drip?
Immediately wipe off any drips using a soft, absorbent lint-free cloth.
Have a question?
Let us do the research. We'll get back to you as quickly as we can.
Need help right away?
Call our Technical Support team at 800-874-4968 (Monday-Friday, 7:30 am - 4 pm Central).