![]() But a big asset of veneer plastering is that is provides a great base for painting. In other instances the plaster can be colored. In many cases the paster is stippled or given other designs and left as is. This is where the special treatment comes in. Usually a second coat can be applied the next day but some only do one. The plasterer will go back over the surface to trowel out any imperfections. Right after this operation the entire wall surface is coated with 1/8†of plaster in a smooth series of motions with a special trowel. This is the same with veneer plastering.Īfter the blue board is installed the seams are taped and plastered, as with normal drywalling, but here is where the similarity ends because there is no waiting for the joints to dry. With a keen eye he or she has to put on a coat of the mixture that is absolutely perfect so that the walls are straight and the corners sharp. This sets it apart from concrete and allows it to be shaped although it was never intended for any loadbearing activities.Ī plasterer is more of an artist that a tradesperson. Plaster: Like the plaster of old this is a gypsum powder which remains soft after drying. ![]() Plaster can be applied to regular drywall but first the surface has to be painted with a special orange-colored compound. Because the entire board is being covered with a wet mixture the board could warp or sag before drying so the protective inner layer prevents this from happening. The first is an absorbent material designed to hold the plaster while the second underlayment is waterproofed to prevent moisture from the plastering process from being absorbed into the gypsum core. On drywall board the binding surface is paper while on blue board there is a two-ply coating. This is a gypsum-cored panel like a drywall sheet only the sheet wrapping is different. Regular drywall board is white or gray, moisture and mold resistant types for kitchens and bathrooms are green and board designed for plastering is blue. Here are the list of materials for veneer plastering and the tools required are similar if not the same as many drywall tools:īlue Board: In North America gypsum board manufacturers color the outside surface of the panel to denote their use. However instead of using wooden lathes the basic platform is actually a form of gypsum board which is installed like drywall but then the entire surface is plastered over. Plastering is becoming popular again with discriminating home builders who want a quality wall. Plaster, on the other hand, is more like concrete because water produces a chemical reaction which bonds the molecules together into a hard mass. The soft gypsum sandwiched by paper shells will not resist much of a force before it dents. The drawback of drywall is that it is not as durable as plaster. In fact a drywall crew could finish a new home in 2 days whereas it took a team of plasterers over a week for the same amount of wall coverage. In many of the older homes the paster is still as smooth as the day it was put on.ĭrywall replaced plastering in the early 1950's because of its ease of use, time to install and, as a result, lower expense. Then the top coat of smooth, white plaster is applied and shaped by the plasterer. In many cases horse hair was added to the mix to assure this bond both to the lathes and the top coat. This was the first coat of plaster, a sandy mixture meant to hold the top or finishing coat. There were 1/4†gaps between the lathes so that the “brown coat†could find a grip. Plastering as an interior wall form began with wooden “lathes†or long wooden sticks, that were 2†wide and 1/4†thick, nailed horizontally over the studs. In the 19th Century the fast-setting gypsum powder became more plentiful and began to replace lime. This plaster was mostly limestone and sand and took almost 2 weeks to harden. The plastering trade reached prominence during the 13th Century in London when, after a huge fire devastated the city, the king decreed that all homes must have plastered walls to prevent fires. In fact some of these walls are still in great shape today. Plaster as an interior wallcovering has been around since the Egyptians used it over 4,000 years ago (but Biblical scholars say that the ancient city of Jericho had plaster walls in 7,000 BC).
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