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3 COAT WORK SYSTEMS

Three-Coat Work: Refers to the installation of a scratch coat (1st layer), a brown coat (2nd layer) and finish coat installed for a full thickness of 5/8" with drying time between each successive coat.

Any application of three-coat, full thickness gypsum plaster to a metal plaster base of expanded metal, woven wire or welded wire that is attached to the structural support of a wall or ceiling. Examples:

 

• Walls: nominal steel studs, wood framing or cold rolled channel with metal lath fastened by a variety of attachment methods.
• Contact Ceiling: A plaster application where the lath is attached directly to the structural ceiling supports.
• Furred Ceiling: A plaster application where lath is attached to cold rolled channel that have been attached directly to the structural ceiling support.
• Suspended Ceiling: A plaster application where cold rolled channel main runners are suspended by wire, rods or other means from the structural ceiling support and additionally cold rolled channel cross furring is positioned transverse to the main runners and wire tied for support. Unrestrained ceilings have perimeters separated from adjacent walls where advisable.

• Security Plaster: An application of high compressive strength three-coat gypsum plaster over metal plaster base. Security plaster as its name implies is intended for use in detention facilities such as jails, prisons, hospitals or in other locations such as banks, courtrooms or any other facility where high strength walls need to be employed. The common element of such construction is the use of what is referred to as security mesh. Although this material resembles conventional metal lath it is a very heavy gauge and installed as a barrier over conventional framing. Metal lath is then tied over the security mesh as the base for the plaster.

 

 

NOTE:

A wall plastered with conventional gypsum plaster is non-combustible. When combined with gypsum plaster bases, gypsum plaster can provide assemblies that can achieve fire ratings of up to two hours for partitions, ceilings and column fireproofing.
Data Sheet   Brochure
MSDS   LEED Data
 

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