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A plasterer is a tradesman who works with plaster, such as forming a layer of plaster on an interior wall or plaster ornamental moldings on ceilings or walls. The process of creating plasterwork, called plastering, has been used in building construction for centuries. Early 19th century plasterer at work - painting by John Cranch (17511821) Plasterwork is one of the most ancient of handicrafts employed in connection with building operations, the earliest proof revealing that the dwellings of primitive man were erected in a simple style with sticks and plastered with mud.
The pyramids in Egypt contain plasterwork executed a minimum of 4 thousand years ago, most likely much earlier, and yet existing, difficult and resilient, at today time. From recent discoveries it has actually been ascertained that the principal tools of the plasterer of that time were almost identical in style, shape and purpose with those used today.
Hair was introduced to reinforce the stuff, and the whole finished somewhat under an inch thick. Really early in the history of Greek architecture we find the use of plaster of a fine white lime stucco, such has actually been discovered at Mycenae. The art had actually reached perfection in Greece more than 5 centuries prior to Christ, and plaster was regularly utilized to cover temples externally and internally, in some cases even where the building was of marble.
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Also known as Gyporockers. In the more common operations of plastering, relatively few tools and few materials are needed, but the worker effective in all branches of the craft will have a large range of implements. The products of the worker are laths, lath nails, lime, sand, hair, plaster of Paris, and a range of cements, together with various ingredients to form coloring washes, et cetera.
Laths are about an inch Lathing-wide, and are made in 3 densities; single (1/8 to 3/16 inch thick), lath and a half (1/4 inch thick), and double (3/8 -1/ 2 inch thick). The thicker laths ought to be utilized in ceilings, to stand the extra pressure, and the thinner range in vertical work such as partitions, except where the latter will undergo rough use, in which case thicker laths become essential.
Laths were formerly all made by hand. A large amount, however, are now made by equipment and are referred to as sawn laths, those made by hand being called rent or riven laths. Rent (riven) laths offer the finest results, as they divided in a line with the grain of the wood, and are stronger and not so responsible to twist as industrial laths, some of the fibers of which are generally cut in the process of sawing.
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Laths needs to be nailed so regarding break joint in bays three or four feet broad with ends butted one versus the other. By breaking the joints of the lathing in this method, the propensity for the plaster to break along the line of joints is lessened and a much better secret is acquired and it provides restraint for the timber frame.
All timbers over three inches (76 mm) wide ought to be counter-lathed, that is, have a fillet or double lath nailed along the centre upon which the laths are then nailed. This is done to preserve an excellent secret for the plaster. Walls liable to damp are often battened and lathed in order to form an air cavity in between the damp wall and the plastering.
There are many sort of this product Metal made in various styles under different patents, the very best known in England being the Jhilmil, the Bostwick, Lathing, and the Expanded Metal lathing. The two last-named are also extensively utilized in America. Lathing nails are usually of iron, cut, wrought or cast, and in the much better class of work they are galvanized to avoid rusting.
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The lime mainly used for internal plastering is that calcined from chalk, oyster shells or other nearly pure limestone, and is called fat, pure, chalk or rich lime. Hydraulic limes are likewise used by the plasterer, chiefly for external work. Perfect slaking of the calcined lime prior to being used is very crucial as, if utilized in a partially slaked condition, it will "blow" when in position and blister the work.
Due to time restraints Hydrated Lime blended with plaster is generally used for modern building. Slaking is not needed if more time is permitted finishing the surface after application which is a common practice where a quality finish is needed, nevertheless in the real estate market it is frequently run for 3 days, the time it takes to prepare a typical house for plastering, to accomplish a lower quality expense reliable surface.
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