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Historic Preservation - Technical Procedures

Spectitle:

Restoring Metal Leaf On Plaster

Procedure code:

0920001R

Source:

National Capitol Region Specifications

Division:

Finishes

Section:

Lath & Plaster

Last Modified:

02/24/2012

Details:

Restoring Metal Leaf On Plaster



RESTORING METAL LEAF ON PLASTER


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on restoring metal leaf
         on existing plaster surfaces and includes cleaning and
         repairing damaged metal leaf.

    B.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure. These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed, when applicable,
         along with recommendations from the Regional Historic
         Preservation Officer (RHPO).  

1.02 SUBMITTALS

    A.   Product Data: Submit manufacturer's product
         specifications and installation instructions for each
         material, including other data as may be required to show
         compliance with these specifications.

    B.   Operation and Maintenance Data: Submit written program
         for each phase of restoration process including
         protection of surrounding materials on building during
         operations. Describe in detail materials, methods and
         equipment to be used for each phase of restoration work.

1.02 PROJECT/SITE CONDITIONS

    A.   Environmental Requirements:

         1.   Monitor environmental conditioning throughout
              construction period. Notify owner if environmental
              conditions vary beyond minimum or maximum allowable
              conditions.

         2.   Dispose of by-products from cleaning and paint
              stripping operations by legal means and in manner
              which prevents damage to other surfaces.

    B.   Existing Conditions: Protect surrounding surfaces from
         damage resulting from chemical cleaning and paint
         stripping work.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Liquidtex, Inc.

2.02 MATERIALS

    NOTE:  Chemical products are sometimes sold under a common
    name.  This usually means that the substance is not as pure as
    the same chemical sold under its chemical name.  The grade of
    purity of common name substances, however, is usually adequate
    for stain removal work, and these products should be purchased
    when available, as they tend to be less expensive.  Common
    names are indicated below by an asterisk (*).

    A.   Protective Coating for Metal Leaf: Varnish designed
         specifically for finishing decorative paintings, such as
         "Soluvar" (Liquidtex, Inc.), or approved equal.

         1.   Use a finish to match existing.

         2.   Thin varnish with paint thinner - one part varnish
              to three parts thinner.

    B.   Paint thinner such as mineral spirits or turpentine

         Mineral Spirits:

         1.   A petroleum distillate that is used especially as a
              paint or varnish thinner.

         2.   Other chemical or common names include Benzine* (not
              Benzene); Naphtha*; Petroleum spirits*; Solvent
              naphtha*.

         3.   Potential Hazards:  TOXIC AND FLAMMABLE.

         4.   Safety Precautions:

              a.   AVOID REPEATED OR PROLONGED SKIN CONTACT.

              b.   ALWAYS wear rubber gloves when handling
                   mineral spirits.

              c.   If any chemical is splashed onto the skin,
                   wash immediately with soap and water.

         5.   Available from construction specialties
              distributor, hardware store, paint store, or
              printer's supply distributor.

         Turpentine:

         1.   Typically used as a solvent and thinner.

         2.   Potential Hazards:  TOXIC AND FLAMMABLE.

         3.   Safety Precautions:

              a.   Work in a well ventilated area.  

              b.   Observe safety rules as turpentine is
                   flammable, and the fumes can trip an
                   ionization smoke detection system.  

              c.   Store soiled cloths in a metal safety
                   container to guard against spontaneous
                   combustion.

              d.   Available from hardware store or paint store.

    B.   Metal Leaf Solvent Cleaner: 1,1,1,   trichloroethane

    C.   Metal Leaf Sizing: Fast-tack sizing designed specifically
         for installation of metal leaf

    D.   Gilding: Tissue booklet of metal leaf - available in
         "patent" leaf (secured within a book) or "loose" leaf

    E.   Japan Color: Yellow ochre or other color pigment in a
         varnish base to match desired color

    F.   Clean, soft cotton balls


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   At locations indicated, clean and conserve existing gold
         or silver leaf on existing plaster surfaces.

    B.   Saturate a rolled cotton ball with solvent cleaner and
         squeeze out excess.

    C.   Gently rub metal leaf surfaces to remove accumulated
         dirt. Replace cotton ball frequently.

    D.   Continue rubbing as required to produce effect
         established by mock-up in a uniform manner over entire
         surface.

    E.   Repair missing or damaged areas by installing new metal
         leaf material.

         1.   Clean surface and sand where required to create a
              smooth finish.

         2.   Apply a coat of Japan color over area.

         3.   Apply a thin coat of sizing to the surface.

         4.   Once proper tack of sizing is reached, position
              metal leaves.

         5.   Smooth leaves and remove excess with a soft brush.
              Fill in small spots where leaf did not stick.

         6.   If gold color is required on silver leaf, apply two
              coats of orange shellac to surface of silver leaf
              to tint similar to adjacent surface.

         7.   See also 05010-27-R for guidance in applying metal
              leaf.

    F.   Apply two coats of protective coating to surface to
         comply with manufacturer's instructions.

3.02 ADJUSTING/CLEANING

    A.   Upon completion of this work, all floors, walls, and
         other adjacent surfaces that are stained, marred, or
         otherwise damaged by work under this section shall be
         cleaned and repaired and the adjacent areas shall be left
         in clean and perfect condition.

    B.   All completed work shall be adequately protected from
         damage by subsequent building operations and effects of
         weather. Protection shall be by methods recommended by
         the manufacturer of installed materials and as approved
         by the RHPO.

                         END OF SECTION