What is Plasterboard?
- May 25, 2015
- Posted by: gary rooney
- Category: Construction, Drywall
Drywall (also known as plasterboard, wallboard, gypsum board, or LAGYP) is a panel made of gypsum plaster pressed between two thick sheets of paper. It is used to make interior walls and ceilings. Drywall construction became prevalent as a speedier alternative to traditional lath and plaster. In many places, the product is sold under the trademarks Sheetrock, Gyproc and Gyprock. In the United Kingdom, Australia and New Zealand the category is known as plasterboard.
The first plasterboard plant in the UK was opened in 1888 in Rochester, Kent. Sackett Board was invented in 1894 by Augustine Sackett and Fred Kane. It was made by layering plaster within four plies of wool felt paper. Sheets were 36″ × 36″ × 1/4″ thick with open (untaped) edges. Gypsum Board evolved between 1910 and 1930 beginning with wrapped board edges, and elimination of the two inner layers of felt paper in favor of paper-based facings. In 1910 United States Gypsum Corporation bought Sackett Plaster Board Company and by 1917 came out with a product they called Sheetrock. Providing efficiency of installation, it was developed additionally as a measure of fire resistance. Later air entrainment technology made boards lighter and less brittle, then joint treatment materials and systems also evolved. Rock Lath (gypsum lath) was an early substrate for plaster. An alternative to traditional wood or metal lath, it was a panel made up of compressed gypsum plaster board that was sometimes grooved or punched with holes to allow wet plaster to key into its surface. As it evolved, it was faced with paper impregnated with gypsum crystals that bonded with the applied facing layer of plaster.
Australia and New Zealand
The term plasterboard is used in Australia and New Zealand, and in the latter country it is also known as Gibraltar board. Both countries use the metric system in building, and plasterboard is manufactured in thicknesses of 10 mm, 13 mm, and 16 mm, and sometimes other thicknesses up to 25 mm. Panels are commonly sold in 1200 x 2400 mm, 1200 x 4800 mm, and 1200 x 6000 mm sheets. Sheets are usually secured to either a timber or steel frame anywhere from 150 to 300 mm centres along the beam and 400 to 600 mm across members.
Various companies, such as Boral and CSR, manufacture plasterboard under various brand names including Gyprock.
The method of installation and type of drywall can reduce sound transmission through walls and ceilings. Several builders books state that thicker drywall reduces sound transmission but engineering manuals recommend using multiple layers of drywall, sometimes of different thicknesses and glued together, or special type of drywall designed to reduce noise. Also important are the construction details of the framing with steel studs, wider stud spacing, double studding, insulation, and other details reducing sound transmission. Sound transmission class (STC) ratings can be increased from 33 for an ordinary stud-wall to as high a rating as 59 with double 1/2″ drywall on both sides of a wood stud wall with resilient channels on one side and fiberglass bat insulation between the studs.
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