Drywall (also called gypsum board, GWB, plasterboard, SHEETROCKŪ and GyprocŪ) is a building material consisting of gypsum formed into a flat sheet and sandwiched between two pieces of heavy paper. It can be easily cut to shape with a small saw or even by scoring the paper backing and then breaking it along the cut. It is then fixed to the wall structure with nails, or more commonly in recent years, screws.
The name refers to its replacement of lath and plaster wall building, in which plaster was spread over small wooden formers while still wet. This method was time consuming and labor intensive (although skilled plasterers could do the job with great rapidity), whereas an entire house can be drywalled in a day or two by two experienced "drywallers", and drywall is easy enough to use that it can be installed by many amateur home carpenters.
In veneer plastering, a specially prepared type of drywall board (blueboard) is covered with several thin coats of plaster.
Greenboard is water resistant drywall. It is suitable for humid areas, but not areas that actually get wet. Concrete backerboard (concrete reinforced with fiberglass) should be used where actual moisture is expected.
Gypsum wallboard is not required throughout a dwelling however it is widely used as an interior finishing material.
Gypsum wallboard is required on the garage side of the wall between the house and garage, in enclosed accessible space under stairs, on a wall of a building less than 3 feet from a property line, and for separations between dwelling units where two or more dwellings exist in the same building.
For 3/8 inch gypsumboard the minimum screw length must be 1 inch, for 1/2 inch gypsumboard the minimum screw length must be 1 1/8 inch, and for 5/8 inch gypsumboard the minimum screw length must be 1 1/4 inch.
In a gypsumboard forming device according to claim 8 wherein said flapper edge mechanism further comprising at least one flapper disposed at the lateral edges of the edger bar assembly, said flappers comprising a smooth surface and having a slippery or non-stick material.
In a gypsumboard forming device according to claim 8, said edger bar further comprising a bottom edge for skimming over the surface of the wet gypsumboard and a pre-forming plate disposed at the leading edge of the edger bar, said pre-forming plate having an angle relative to the surface of said bottom edge.
Gypsumboard with mineral fiber facing sheets may be produced in multiple layers, including, but not limited to, a strong, more dense upper and lower surface layers and a less strong and less dense middle layer or core.
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