Mudder A slang name for a plasterer or drywall finisher but only if you are close friends. It is common to use gypsum plaster as the undercoats in a plaster wall because gypsum plaster is stronger than lime plaster with lime plaster as the final coat because of its smoother finish. Until the use of gypsum was developed as a bonding material in the 18th century, this was the only type of plaster available. Lime Plaster: A plaster mixture containing hydrated lime as the bonding agent rather than the more common gypsum. Today both lathing and plastering are usually done by the same person. Plasterers themselves seldom attached lath – too menial a job for a skilled plasterer. In earlier times, Lathers were essentially apprentice plasterers. Once the lather is done, the plasterer applies plaster to the lath. Lather: (Pronounced "LATH er" with a hard "TH" – as in "baTH", not "lath er" with a soft "TH" like in shaving cream.)Ī person who attaches lath to wall studs and ceiling joists. Lath: Thin wood strips or metal mesh attached to wall studs and ceiling joists to which plaster is applied. It has been replaced by fiberglass in common use because fiberglass strands are stronger (and because horses have raised strenuous objections). Now rarely used except in historic restorations. Horsehair Plaster: An early form of hydrated lime plaster to which horse hair was added for greater strength. Commonly used as the first and second coats of a plaster wall, with the smoother lime plaster used as the finish coat.
Discovered in the 18th century, gypsum replaced lime as the preferred bonding agent in plaster and cement because it is stronger than lime and cures much more quickly. Gypsum Plaster: A plaster mixture containing gypsum as the bonding agent. Synonyms include gypsum boards and drywall. It may also be used as exterior wall sheathing, in which case a water-resistant material replaces the paper. The panels are used to cover interior walls and ceilings and are the most common materials for that purpose since gypsum drywall replaced true plaster in the 11940s and '50s. Gypsum Drywall: Panels made of a sandwich of gypsum plaster pressed between two sheets of paper. The newer purpleboard and paperless gypsum drywall have now replaced greenboard for applications where mold and water resistance is necessary. Other manufacturers adopted the color scheme. Gypsum originally colored its water-resistant gypsum board green to distinguish it from its other gypsum board products. Greenboard or Green board: A type of gypsum drywall suited for use in damp (but not wet) areas such as bathrooms. Rockers are usually not finishers and vice versa. Rockers hang the drywall, finishers finish it. It is also called the white coat (from the color of lime plaster which is whiter than gray or brown gypsum plaster under it), especially by old-time plasterers and may also be called the color coat because chemical tints were often added to the lime plaster to give the wall its final color.įinisher A person who tapes and finishes gypsum drywall.
The final (finish) coat is usually hydrated lime plaster or a blend of gypsum and lime plaster because lime plaster works to a smoother finish than the stronger but coarser, gypsum plaster. It is applied to the second or "brown" coat and is finished to a smooth surface ready for paint or wallpaper. Also see: Sheetrock.įinish Coat: The final coat of a three-coat plaster wall or ceiling system. The brown coat is no longer brown in color but the name persists from the days when the hydrated lime second coat was darker than the final or white coat.ĭrywall: The most common name for gypsum drywall. It is typically about 3/8" thick.Īny unevenness left in the scratch coat is removed by the brown coat which leaves a flat, level surface for the final or "finish" coat. The brown coat is the leveling coat applied over the first or "scratch" coat of gypsum plaster. Other manufacturers adopted the color scheme.īrown Coat: The second coat of a three-coat plaster wall or ceiling system. Gypsum originally colored its plasterboard blue to distinguish it from its other gypsum board products.
In your locality, there may be slight variations.īlueboard or Blue board: A term commonly used in the construction trades to mean plasterboard. Here is some common plaster and drywall terminology as used in the Mid-West. Like all fields in the building trades, plastering and drywall have their own peculiar terminology. A Glossary of Plaster & Drywall Terminology
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