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About Us
Full coat interior plaster begins with a scratch coat (made of gypsum plaster and sand) over some kind of base. A hundred years ago it was wood lath, brick or clay tile; thirty years ago it might have been rocklath (a 3/8" sheet 16" X 48" that looks a little like drywall), metal lath, block or tile. Today it is most likely metal lath or gypsum base (similar to drywall but with a different type of paper).
The scratch coat "keys" into the base and stiffens it for the subsequent coats. It is left very rough so that the next coat, the brown coat, can get a good bond. If thicker plaster is desired, it can be left to "set", i.e. get hard, then "double back" and put another coat of the same material right over top of it to the desired thickness. The brown coat is also left rough, although not as rough as the scratch coat.
The finish coat is then applied to a thickness between 1/16--1/8". The finish usually consists of lime mixed with something to make it set faster. The finish can be perfectly smooth, often referred to as "white coat", or textured in ways limited only by the imagination. Sand may also be added to give a variety of effects.
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