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Historic Preservation - Technical Procedures

Spectitle:
Stripping Built-Up Floor Coatings From Marble

Procedure code:
0445519R

Source:
National Capitol Region Specifications

Division:
Masonry

Section:
Marble

Last Modified:
02/24/2012

Details:
Stripping Built-Up Floor Coatings From Marble



STRIPPING BUILT-UP COATINGS FROM MAR= BLE


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on stripping built-up
         coatings from marble surfaces.  The= se may include floor
         coatings splashed onto adjacent marble surfaces.

    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 Precaution= s

         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 SYSTEM DESCRIPTION

    A.   Performance Requirements:  The objectives for marble
         cleaning are to remove dirt, grime and coatings from the
         surfaces without damaging the underlying material and to
         give all the marble a clean uniform appearance without
         blotches.

1.03 SUBMITTALS

    a.   Samples:

         1.   Sample panels for cleaning and patching shall be
              prepared for approval and shall establish a
              standard for all marble work. The locations and
              types of control samples are to be indicated on a
              plan, with a photograph of each control sample to
              be submitted to the Contr= acting Officer's
              representative. No work shall commence until
              written approval for the control samples has been
              obtained from the Contrac= ting Officer's
              representative.

         2.   The Contractor shall clean sample panels 2'-0" by
              2'-0" in area, on each color and type of marble,
              for approval by the Contr= acting Officer's
              representative. Locations of sample panels to be
              selected by the Contracti= ng Officer's
              representative.

1.04 QUALITY ASSURANCE

    A.   Regulatory Requirements:

         1.   Comply with municipal and Federal regulations
              governing all work includ= ed in this section and
              including, but not limited to, cleaning, waste
              disposal and protection to adjacent properties.

         2.   Contractor: The work shall be performed by a firm
              possessing a minimum of five (5) years of
              specialized experience in the restoration and
              cleaning of historic architectural marble, similar
              to that which is required in this project. The
              Contractor shall submit to the Contracting
              Officer's representative references of previous
              work, justifying the firm's experience. The
              Contracting Officer's representative reserves the
              right to approve or disap= prove the use of the
              Contractor contingent upon their experience.

              a.   NOTE: The quali= ty of the work is highly
                   depen= dent on the competence of the Contractor
                   becau= se it is not possible to anticipate every
                   varia= tion encountered int he surfaces, job
                   condi= tions and methods used.


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

    B.   Eastern Marble Supply Company

2.02 MATERIALS

    A.   Water: Potable, non-staining and free of oils, acids,
         alkalis and organic matter.

    B.   Polishing Compound - An acid-free abrasive compoun= d
         containing no caustic or harsh fillers or ingredients
         with natural resins added, manufactured specifically for
         polishing interior marble surfaces, such as "RS2B"
         (Eastern Marble Supply Company), or approved equal.

    C.   Cleaning Agents -(General Cleaning): A poultice
         incorporating surfactants and biodegrada= ble detergents in
         dry form for the removal of general staining.
         Commercially available. The poultice is mixed with water
         and an additive containing special deter= gents and wetting
         agents, such as "Sure Klean Marble Poultice", "Sure Klean
         Marble Poultice Additive" (ProSoCo, Inc.), or approved
         equal.

    D.   Cleaning Agents -(Built-Up Coatings): a non-acidic gel-
         like application for removal of built-up stains using
         thixotropic alkali materials with a pH value between 7
         and 10, such as "Sure Klean Liquid Marble Cleaner", "Sure
         Klean T-942 Limestone Cleaner" (ProSoCo Inc.), or approved
         equal.

2.03 EQUIPMENT

    A.   Stainless steel trowel

    B.   Wood scrapers

    C.   Stiff bristle brushes (non-ferrous bristle)


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:    

         1.   Take all necessary precautions and measures to
              protect all surrounding materials from damage that
              might be incurred during the marble restoration
              work. Any damage caused by the Contractor to other
              materials is unacceptable and shall be repaired or
              replaced by the Contractor to the satisfaction of
              the Contracting Officer's representative, at not
              cost to the Government.
         2.   Improper use of chemicals may constitute a health
              hazard. Refer to manufact= urer's Material Safety
              Data Sheets for hazard data, special protection,
              for use and precautions to be taken in handling and
              storage. Comply with manufacturer's recommendations
              for proper use of chemica= ls.


3.02 ERECTION, INSTALLATION, APPLICATION
   
    A.   Cleaning Existing Built-Up Coating from Marble:

         1.   Strip built-up splashed floor coatings from the
              lower part of marble veneer walls by applying
              thixotropic alkali materi= als to the stone ("Sure
              Klean Liquid Marble Clean= er", and low pressure cold
              water rinsing (less than 100 psi). Brush apply the
              materials undilulted and let dwell for 20 to 60
              minutes depending on field test trials. Do not
              allow cleaners to dry. The Contractor should clean
              one whole panel at a time, so as to maintain a
              uniform result on each panel and prevent cleaning
              overlap.

         2.   Before rinsing, scrub for 5 to 10 minutes with
              bristle brushes to loosen tenacious coatings. Do
              not use metal brushes. Repeat application for
              stubborn build up. Do not allow cleaners to come in
              contact with the adjacent materials.

    B.   General Cleaning of Marble: Remove soiling and stains
         from marble veneer using a poultice incorporating
         surfactants and detergents.

         1.   Prepare the poultice by mixing the additive with
              the dry poultice (fuller's earth) to the
              consistency of thick cream and apply a =AC" thick
              layer to the pre-wet masonry using a stainless
              steel trowel or a non-fer= rous implement.

         2.   Cover the poultice with a membrane and allow to dry
              for 8 to 24 hours dependi= ng on field test trials.

         3.   Scrape poultice from the mason= ry with a non-
              metallic implement and scrub with water and a fiber
              bristle brush.

         4.   Rinse with low pressure water to remove all traces
              of the poulticing materia= ls. The removal of crusted
              splashed coatings should precede general poultice
              cleaning in order to achieve a uniform result.

                         END OF SECTION