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Historic Preservation - Technical Procedures

Spectitle:

Stripping Built-Up Floor Coatings From Terrazzo

Procedure code:

0940011R

Source:

National Capitol Region Specifications

Division:

Finishes

Section:

Terrazzo

Last Modified:

02/24/2012

Details:

Stripping Built-Up Floor Coatings From Terrazzo



STRIPPING BUILT-UP COATINGS FROM TERRAZZO


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing built-up
         floor coatings from terrazzo floors.

    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 REFERENCES

    A.   National Terrazzo and Mosaic Association, Inc.(NTMA),
         3166 Des Plaines Avenue, Ste. 132, Des Plaines, IL
         60018, 800/323-9736 or 708/635-7744, FAX (708) 635-9127.

1.03 SYSTEM DESCRIPTION

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

1.04 SUBMITTALS

    A.   Samples:

         1.   Sample panels for cleaning and terrazzo patching
              shall be prepared for approval and shall establish
              a standard for all terrazzo 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 Contracting Officer's
              representative. No work shall commence until
              written approval for the control samples has been
              obtained from the Contracting Officer's
              representative.

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

1.05 QUALITY ASSURANCE

    A.   Regulatory Requirements:

         1.   Comply with specified provisions and
              recommendations of the National Terrazzo and Mosaic
              Association, Inc. (NTMA Standards).

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

         3.   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 terrazzo,
              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 disapprove the use of the
              Contractor contingent upon their experience.

              a.   NOTE: The quality of the work is highly
                   dependent on the competence of the Contractor
                   because it is not possible to anticipate every
                   variation encountered int he surfaces, job
                   conditions and methods used.

         4.   Where current codes cannot be complied with, and/or
              construction limitations (including deterioration
              of existing substrate) are such that the intended
              finish cannot be achieved, notify the Regional
              Historic Preservation Officer (RHPO) for
              clarification and/or decision prior to proceeding
              with the work.  

         5.   Mock-ups:  Strip and clean 20 square feet of each
              terrazzo type for review by RHPO before stripping
              and cleaning all the terrazzo.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   General Paint and Chemical Company
         Division of Cotter and Company
         Chicago IL  30314
         708/639-4385

2.02 MATERIALS

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

    B.   Interior Terrazzo Floor Sealer: Colorless slip and stain
         resistant non-penetrating sealer with pH factor between
         7 and 10, that does not affect the color or physical
         properties of the existing terrazzo surface.

    C.   Cleaning Agents - (Built-Up Coatings): A non-ammoniated
         liquid wax stripper/floor cleaner, such as "Tru-Test
         Floor Stripper FS10" (General Paint and Chemical
         Company), or approved equal.

2.03 EQUIPMENT

    A.   Wood scrapers

    B.   Fiber bristle brushes


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 terrazzo restoration
              work describe din this outline specification. 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 manufacturer'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 chemicals.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Strip built-up floor coatings from the terrazzo flooring
         by applying a dilute cleaner (such as Tru-Test Stripper
         FS.10). Let dwell for 5 to 20 minutes depending on test
         trial results, scrub with fiber bristle brush, a
         mechanical floor machine, or white nylon pad, and rinse
         with low pressure cold water (less than 100 psi).

    B.   Do not use metal brushes. Repeat application for stubborn
         build up. Do not allow cleaner to dry on the floor. A
         testing program monitored by the Contracting Officer's
         representative should be undertaken to verify procedures,
         methods and dwell times.

    C.   Apply penetrating type sealer to reduce the porosity of
         the terrazzo and increase its resistance to acid and
         alkalis.  Follow manufacturer's instructions.

                         END OF SECTION