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Historic Preservation - Technical Procedures

Spectitle:

Removing Dirt Build-Up On Ornamental Metal

Procedure code:

0570002R

Source:

National Capitol Region Specification - Old Executive Off

Division:

Metals

Section:

Ornamental Metalwork

Last Modified:

02/24/2012

Details:

Removing Dirt Build-Up On Ornamental Metal



REMOVING DIRT BUILDUP ON ORNAMENTAL METAL


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on cleaning and
         polishing unpainted ornamental metal surfaces and
         applying a new clear finish.

    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 QUALITY ASSURANCE

    A.   Mock-ups:  Demonstrate materials and methods to be used
         for cleaning, paint stripping, and polishing for each
         type of ornamental metal surface and condition on sample
         panels of approximately 9 square feet in area.  Test
         adjacent non-metallic materials for possible reaction
         with cleaning and paint stripping materials.

1.03 PROJECT/SITE CONDITIONS

    A.   Protect surrounding surfaces of building from damage
         resulting from ornamental metal restoration work.

    B.   Prevent chemical cleaning and paint stripping solutions
         from coming into contact with other surfaces which could
         be inured by such contact.

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


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   ProSoCo, Inc.
         755 Minnesota Avenue
         P.O. Box 1578
         Kansas City,  KS  66117
         800/255-4255 or 913/281-2700

2.02 MATERIALS

    A.   Chemical Cleaner:  Manufacturer's standard strength
         acidic ornamental metal restoration cleaner, such as
         "Sure Klean 887 Stainless Steel Cleaner," (ProSoCo,
         Inc.), or approved equal.

    B.   Protective Lacquer: Clear non-yellowing for protection of
         the finished metal surface.

    C.   Water for Cleaning: Clean, potable, free of oils, acids,
         alkalis, salts, and organic matter.

    D.   Cleaning Pads: No. 4/0 fine steel wool or synthetic pads.

2.03 EQUIPMENT

    A.   Brushes: Fiber bristle only.


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:

         1.   Comply with recommendations of manufacturers of
              chemical cleaners and paint removers for protecting
              building surfaces from exposure to their products.

         2.   Protect glass, unpainted metal trim and polished
              stone from contact with acidic chemical cleaners by
              covering them with liquid strippable masking agent
              or polyethylene film and waterproof masking tape.
              Apply masking agent to comply with manufacturer's
              recommendations. Do not apply liquid masking agent
              to adjacent painted or porous surfaces, use
              waterproof masking tape.

         3.   Protect unpainted metal from contact with alkali
              chemical cleaners by covering them either with
              liquid strippable masking agent or polyethylene
              film and waterproof masking tape.

         4.   Remove cellophane tape, masking tape, etc., from
              ornamental metal surface prior to cleaning.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Brush apply chemical cleaner to ornamental metal surfaces
         in the concentration recommended by the manufacturer.

    B.   Agitate surface with either steel wool or synthetic
         cleaning pad. Follow direction of grain in metal. Do not
         scratch or abrade surface.

    C.   Thoroughly sponge or cloth rinse surface with clean water
         to remove chemical cleaner and loosened dirt.

    D.   Machine or hand polish metal where indicated with buffing
         wheel or soft cloth using polishing compound typically
         recommended as standard industry practice and as approved
         by the RHPO.

    E.   Repeat process as required to produce desired effect.

    F.   Wipe surface completely dry with clean soft cloths. Do
         not touch cleaned ornamental metal surfaces.

    G.   Immediately apply two coats of protective lacquer finish
         to surface.

                         END OF SECTION