Last edited by Voodoora
Tuesday, January 28, 2020 | History

2 edition of Preserving historic ornamental plaster found in the catalog.

Preserving historic ornamental plaster

David Flaharty

Preserving historic ornamental plaster

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  • 8 Currently reading

Published by U.S. Dept. of the Interior, National Park Service, Cultural Resources/Preservation Assistance in Washington, D.C .
Written in English

    Subjects:
  • Plasterwork, Decorative -- United States -- Conservation and restoration.

  • Edition Notes

    StatementDavid Flaharty.
    SeriesPreservation briefs -- 23.
    ContributionsUnited States. National Park Service. Preservation Assistance Division.
    The Physical Object
    Pagination14 p. :
    Number of Pages14
    ID Numbers
    Open LibraryOL15572908M

    A third coat is applied to even out the surface, followed by light sanding. Alternatively, a severely damaged medallion can be replaced using the fragments as physical documentation to cast a visually accurate replacement. Longer lengths of cornice may be run in place, much as they were historically. Wood lath is typically about one inch 2. Replastering Over the Old Ceiling If a historic ceiling is too cracked to patch or is sagging but not damaged from moistureplasterers routinely keep the old ceiling and simply relath and replaster over it. Our specialty is finding sensitive, responsible and creative solutions to the many problems that arise in adapting old buildings to modern uses, while preserving the unique character and craftsmanship of each historic structure.

    Plastering techniques were forgotten because they were often not passed down within shops and families. Our principal, Stephen Ortado, is a carpenter by trade, an engineer by training and a preservationist by avocation. When the mechanical bond with the lath is broken, plaster becomes loose or bowed. With gypsum board lath rock lath, plasterboardit is the only base coat needed.

    The wet plaster is "scratched" with a scarifier or comb to provide a rough surface so the next layer of base coat will stick to it. Quick-setting joint compound dries because of a chemical reaction, not because of water evaporation. Models Models, whether of capitals, cornices, medallions or cartouches, are made as whole units or in parts depending on project demands. These grounds help keep the plaster the same thickness and provide a stopping edge for the plaster. Tooling for plain-run moldings called for a sheet metal template of the molding profile mounted on a wooden "horse". A tour of a sizeable shop will include observation of running techniques and the results of this activity should be much in evidence.


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Preserving historic ornamental plaster book

To prevent this, a plasterer had to add fine silica sand or finely crushed perlite to the finish coat to compensate for the dramatically differing shrinkage rates between the base coat and the finish coat. The restored cornice is shown below. Known most commonly as "blue board," the panels are covered with a special paper compatible with veneer plaster.

After the first application of a quick setting joint compound dries, a second coat is used to cover the tape, feathering it at the edges.

Plaster is a significant part of the "fabric" of the building. Expanded metal lath or gypsum board lath is nailed over the furring strips.

Brian has dedicated his life to the preservation of history, saving structures that were built at a time when there was an abundance of skilled artisans. In addition, we have nurtured valued working relationships with some of the most accomplished artisan specialists in the country.

A helper feeds new plaster onto the board, as the plaster is applied in quantity.

ORNAMENTAL PLASTER AND COMPOSITION RESTORATION

Drawing and design space should be separate from the production floor. Long-sleeved clothing and head-and-eye protection should be worn. If plaster in adjacent rooms is still in good condition, walls should not be pounded—a small trowel or pry bar is worked behind the plaster carefully in order to pry loose pieces off the wall.

The Preservation of Historic Architecture

First, roof or plumbing leaks must be repaired to eliminate the problem of water intrusion. If a crack seems to be expanding, a structural engineer should be consulted. Our company has considerable experience in historic preservation projects.

With a fresh coat of paint in the complimentary trim color, they add curb appeal to the home. It boasted a gymnasium, a Cantina for cards, chess, and dominoes, a billiard room with five billiard tables, and a three lane bowling alley. Kay D. After the crack is covered with fiberglass mesh tape, all will be skim-coated with a patching compound.

Appearing as diagonal lines in a wall, stress cracks usually start at a door or window frame, but they can appear anywhere in the wall, with seemingly random starting points. Although property owners cannot duplicate the years of accumulated knowledge and craft skills of a professional plasterer, there are materials that can be used for do-it-yourself repairs.

Designed to reduce the cost of materials, a more recent lath and plaster system is less expensive than a two-or-three coat plaster job, but only slightly more expensive than drywall.

Casting the Molds Casting operations should appear clean and efficient. In three-coat work, the scratch coat and brown coat were sometimes applied on successive days to make up the required wall thickness.

Temporary lath guides are then placed vertically to the wall, usually at the studs. Robert McDonald Cordos Construction From local flat plaster to the most complex proscenium arch removal and reinstallation at Northrop Auditorium on the Campus of the University of Minnesota, and the plaster conservation at the Cathedral of St.

When the base coat has set but not dried, more plaster is applied to create a smooth, level surface. It is clear as more and more projects are undertaken, that there is a wide disparity of skills within the trade today.

Also, if cracking or loss of all three coats has occurred and is not combined with major structural failure, it can be repaired much like flat wall plaster. Carpenter Brian is highly in demand in his own neighborhood of Seminole Heights.

Finally, guidance on using substitute materials to match the historic appearance of ornamental plasterwork—a legitimate option within the Secretary of Interior's Standards for the Treatment of Historic Properties—is not discussed here, but will be the subject of another Brief on interiors.A gallery of our plaster jobs over the years.

Practically all types of plaster are represented here, from ornamental work, to lath and plaster. From veneer plaster to color plaster finishes. All my jobs are in the Washington, DC area or Virginia. Repairing Historic Flat Plaster — Walls and Ceilings The Preservation and Repair of Historic Stucco Preserving Historic Ornamental Plaster Heating, Ventilating, and Cooling Historic Buildings: Problems and Recommended Approaches The Preservation of Historic Signs The Preservation and Repair of Historic Log Buildings The Repair and Replacement of Historic Wooden Shingle Roofs The Preservation of Historic Barns Restoring Historic Flat Plaster-Walls and Ceilings The Preservation and Repair of Historic Stucco Preserving Historic Ornamental Plaster Heating, Ventilating, and Cooling Historic Buildings: Problems and Recommended Approaches Full text of "Preserving Historic Ornamental Plaster" See other formats 3 PRESERVATION BRIEFS JNIVERSJTY OF G£ORS?A DEC 0^ Preserving Historic Ornamental Plaster David Flaharty U.

S. Department of the Interior National Park Service Cultural Resources/Preservation Assistance LIBRARIES DEPOSITORY From the time America struggled for a new identity as a constitutional republic— and. Ornamental plaster is a key piece to the beauty and aesthetic of many churches, theatres, residences, and historic buildings.

We take pride in our ability to create and maintain that beauty through casting these ornamental pieces in plaster or fiberglass and restoring your existing pieces.

Preservation Briefs

tion of ornamental plasterwork in new construction. Finally, guidance on using substitute materials to match the historic appearance of ornamental plaster­ work-a legitimate option within the Secretary of Interi­ or's Standards for Historic Preservation Projects-is not discussed here, but will be the subject of another Brief on interiors.