In basic carpentry Gypsum board is sometimes called wallboard, plasterboard, drywall, or sheetrock. Carpenters use it extensively in construction. The term Sheetrock is a brand name for gypsum board company however, the brand name is such a popular use it has become a generic name for gypsum panels. Sheetrock makes a strong, high-quality, fire-resistant wall and ceiling covering. It is readily available, easy to apply, decorate, or repair and it is relatively inexpensive.
In carpentry there are many types of gypsum panels that are available for a variety of applications. The board or panel is composed of a gypsum core encased in a strong smooth-finish paper on the face side and a natural finish paper on the backside. The face of the paper is folded along the edges. This reinforces and protects the core. The long edges are usually tapered. This allows the joints to be concealed with compound or Spackle without any noticeable flaws and a build up of compound on the surface.
Types of Gypsum Panels
Most gypsum panels (sheetrock) can be purchased if desired with an aluminum foil backing. The backing functions as a vapor retarder. It helps prevent the passage of interior water vapor into wall and ceiling spaces.
REGULAR-Regular gypsum panels are most commonly used for single or multilayer application. They are applied to interior walls and ceilings in new construction and remodeling.
Eased Edge-An eased edge gypsum board has a special tapered, rounded edge. This produces much stronger and concealed joint than a tapered square edge.
Type X-is typically known as fire code board. It has greater resistance to fire because of special additives that are added to the core. Type X is manufactured in several degrees of resistance to fire. Type X looks the same as regular sheetrock. However it is labeled Type X on the edge or on the back.
Water-Resistant-or moisture resistant board (MR) consists of special moist resistant core and paper cover that is chemically treated to avoid moisture. It is frequently used as a base for application of wall tile in bathrooms and other areas that are subjected to moisture. It’s easily recognized by its distinctive green face. In basic carpentry or on the work field they normally call it Green board. Water resistant Panels are available with a type x core for increased fire resistance.
Special Purpose-Backing board is designed to be used as base layer in multilayer systems. It is available with regular or Type X cores. Core-board comes in 1-inch thickness. It is used for various applications including the core of solid gypsum partitions. It comes in 24-inch widths with a variety of edge shapes. Predecorated panels have coated, printed or overlay surfaces that require no further treatment. Linerboard has a special fire resistant core encased in a moisture repellent paper it is used to cover shaft walls, stairways, chase ways, and similar areas.
Veneer Plaster Base-carpenters commonly call it blue board. They are large 4-foot wide gypsum board panels faced with a specially treated blue paper. This paper is designed to receive applications of veneer plaster. Conventional plaster is applied about 3/8 inch and takes considerable time to dry. In contrast, specially formulated veneer plaster is applied in one coat of about 1/16 inch, or two coats totaling about 1/8inch. It takes only about 48 hours to dry.
Gypsum lath is used as a base to receive conventional plaster. Other gypsum panels such as a soffit board and sheathing are manufactured for exterior use.
Cement Board-like gypsum board cement board or wonder board are panel products. However they have a core of Portland cement reinforced with a glass fiber mesh embedded in both sides. The core resist water penetrates and will not deteriorate when wet. It is designed for use in areas that may be subjected to high moisture conditions.
Carpenters commonly use it in bathtub, shower kitchen, and laundry areas as base for ceramic tile. In fact, some building codes require use in these areas. Panels are manufactured in sizes designed for easy installation in tub and shower areas with a minimum of cutting. Standard cement board panels come in thickness of a 1/2 of a inch, in widths of 32 or 36 inches, and in 5 Foot lengths. Custom panels are available in a thickness of 5/8 inch, widths of 32 or 48 inches, and lengths from 32 to 96 inches.
Cement board is also manufactured in a 5/16inch thickness. It is used a underlayment for floors and countertops. Exterior cement board is used primarily as a base for various finishes on building exteriors.
Thicknesses Of Gypsum Board
A 1/4 inch thickness is used as a base layer in multilayer applications. It is used to cover existing walls and ceiling remodeling work. It can be applied in several layers for forming curved surfaces with short radii.
A 3/8 thickness is usually applied as a face layer in repairing and remodeling work over existing surfaces. It is also used in muliapplications in new construction.
Both 1/2 and 5/8 are common used thick nesses for gypsum board for single layer wall and ceiling application in residential and commercial construction. The 5/8 thick is more ridged. It has greater resistance to impacts and fire.
Core boards and linerboards come in thickness of 3/4 and one inch.
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