Stucco (Portland cement Plaster)

Stucco is generally used as an exterior plaster. It consists of Portland cement, Masonry cement (or lime) and sand. Stucco is known for its durability and is easily decorated in a wide range of finishes and textures.

Gypsum Plaster

The Cadillac of interior wall systems. Gypsum plaster is extremely durable and can be finished in a range of textures from smooth to rough. Gypsum plaster was the interior wall material of choice for much of the 20th Century.

Gypsum Veneer Plaster

Veneer plaster (or hard-coat plaster) is a high-strength, gypsum plaster applied in very thin coats over a special type of drywall known as "blue board." It is exceedingly durable and is finished just like full thickness gypsum plaster.

Ornamental Plaster

Ornamental plaster is the term used to describe highly decorative, architectural shapes such as cornices, capitals, flutes, leaf, dentils, etc. Ornamental plaster can be "run" in place or cast in a mold and installed.

Venetian/Decorative Plaster

Recent years have seen a renewed interest in Old World style finish plasters commonly known as Venetian plasters.  A true Venetian plaster consists of specially prepared, aged lime.  Most of today's decorative materials use modern technologies to create a desired effect such as "marble," "aged limestone", "granite" and the like. ,

Acoustical Plaster

A specially formulated type of plaster that exhibits very effective noise reduction characteristics. Brand names include; USG Acoustic Plus, Baswa-phon, Star Silent and Fellert.

Direct-applied Exterior Finish System (DEFS)

DEFS (or TAFS, Textured Acrylic Finish System as it is sometimes called) contains the features of an EIFS without the insulation board.

The texture of a finish coat goes a long way in determining what the final product will look like.  Smooth textures are generally restricted to interior use because the properties of exterior-type materials, like Portland cement, do not easily lend themselves to smooth applications.
Texture also plays a major role in opacity, or "hide capability." Finishes with fine grain aggregates lack the capability to hide imperfections in the preceding coats and should be avoided on large, vertical, exterior surfaces exposed to substantial amounts of sunlight.

Swimming Pool Plaster

Many swimming pools feature a plaster finish. This highly-specialized part of the craft features materials that maintain functionality underwater. Recent decades have seen the emergence of extended-life, decorative, colored pool finishes such as Pebble-Tec, Diamond Brite and others

Exterior Insulation & Finish Systems (EIFS)

Generic term for such proprietary wall cladding systems such as Dryvit, STO, Senergy, Parex.  EIFS features Expanded Polystyrene Insulation board covered with a fiberglass reinforced, flexible basecoat material and a 100% acrylic finish. EIFS is one of the most popular cladding systems in use in commercial construction today because of its insulation characteristics, flexibility and wide range of color selection.

Spray-applied Fireproofing

Fireproofing is a widely-used, specialty material that protects structural steel in case of fire in commercial construction. The material is generally applied with specialty spray equipment and contributes greatly to the fire-resistance of a given building.

St. Louis Plaster Bureau in St Louis

PLASTER.... Just What Is It?

Plaster is a term that applies to a family of loosely related finishing products from gypsum to Portland cement to modern acrylic coatings. It could be said that plaster is any material applied by a plasterer. Whether we're talking about Exterior Insulation and Finish Systems (EIFS), Stucco, Gypsum Plaster, Ornamental Plaster or acoustical plaster, the material is generally applied by hand by someone skilled in the use of the tools of the plastering trade. That means that each plaster wall or ceiling exhibits its own unique characteristics 

Plaster can take virtually any shape and/or color.  Some plasters require the addition of other materials such as sand, while others require only water, while others still are ready to use from the factory.

Despite their versatility most plaster products have limitations. Gypsum plasters are best used in dry, interior applications, while Portland cement products are suitable for use in exterior and "wet" areas. Generally speaking, plaster is also temperature sensitive. That means it should not be applied when the ambient temperature is near freezing.

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Types of Plasters and Their Uses

St. Louis Plaster Bureau