Decorative trim made from fibrous plaster is lightweight, putting less of a strain on the ceiling of a room.
Fibrous plastering is a technique that involves molding decorative plaster pieces over a canvas backing and a wood or metal frame, according to Primo Plasterers. This produces lightweight, inexpensive molding, trim and decorative cornices that are easy to install. The technique was developed in the 19th century to make decorating theaters and homes easier. Whether you are making your own fibrous plaster pieces or installing pre-made molding, there are a few specialized tools you will need.
Molds
Making new fibrous plaster pieces from scratch requires an original and a mold, says the Building Conservation website, because the plaster part of the piece is poured like in other plaster applications. Molds can be made from a variety of materials, including resin, fiberglass and rubber. Compounds are available for making a cast from an existing fibrous plaster piece. These molds are the most important tool for restoring and replacing antique fibrous plaster pieces in restored theaters and museums.
Nails and Screws
Once a fibrous plaster piece is dried and ready for installation, it must be attached to the ceiling or wall with a specially designed adhesive. But in most cases adhesive alone is not enough, according to Hodkin & Jones, and screws or nails must be used to secure it as well. Nailing or screwing fasteners into a delicate piece of fibrous plaster requires a steady hand. Using a quality drill that does not disturb your aim with strong vibrations will prevent you from damaging or cracking the plaster. A small metal nail set should be used with a hammer to keep the tool from making contact with the plaster.
Filling Knife
During the installation process of fibrous plaster molding or cornice, a thin and even layer of adhesives must be applied. A putty or filing knife is the best tool for this job, says Hodkin & Jones. When a miter cut must be made to join two pieces in a corner, the small gap between the two must be filled with liquid plaster and shaped to look natural. A joint or filing knife works best for this job as well.
Heavy-Duty Shop Vacuum
Whether you are making, installing or repairing fibrous plaster, gypsum dust will be created that will coat every surface where you are working. A heavy-duty shop vacuum, preferably fitted with vacuum bags to trap the dust, must be used to clean up, recommends the Old House Web site. The dust created by fibrous plaster is so fine that it will completely clog the filter on a conventional vacuum in just a few minutes and burn the motor up. Filters on shop vacuums will also quickly become clogged unless a bag is used inside the canister.
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