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Historic Preservation - Technical Procedures

Spectitle:

Removing Tobacco Stains From Terrazzo Floors

Procedure code:

0940007R

Source:

Developed For Hspg (Nps - Sero)

Division:

Finishes

Section:

Terrazzo

Last Modified:

02/24/2012

Details:

Removing Tobacco Stains From Terrazzo Floors



REMOVING TOBACCO STAINS FROM TERRAZZO FLOORS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing tobacco
         stains 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).

    C.   For general information on the characteristics and
         maintenance of terrazzo, see 09400-01-P.


PART 2---PRODUCTS

2.01 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.   Trisodium phosphate crystals:  

         NOTE:  THIS CHEMICAL IS BANNED IN SOME STATES SUCH AS
         CALIFORNIA.  REGULATORY INFORMATION AS WELL AS
         ALTERNATIVE OR EQUIVALENT CHEMICALS MAY BE REQUESTED FROM
         THE ENVIRONMENTAL PROTECTION AGENCY (EPA) REGIONAL OFFICE
         AND/OR THE STATE OFFICE OF ENVIRONMENTAL QUALITY.

         1.   Strong base-type powdered cleaning material sold
              under brand names.

         2.   Other chemical or common names include Sodium
              Orthophosphate; Tribasic sodium phosphate;
              Trisodium orthophosphate; TSP*; Phosphate of soda*;
              (also sold under brand names such as).

         3.   Potential Hazards:  CORROSIVE TO FLESH.

         4.   Available from chemical supply house, grocery store
              or supermarket or hardware store.

    B.   Chlorinated lime

    C.   Powder talc

    D.   Clean, hot water

2.02 EQUIPMENT

    A.   Wooden paddle or trowel

    B.   Wood or plastic spatula

    C.   Stoneware jar

    D.   Shallow enameled pan


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Examine the terrazzo surface carefully to determine the
         cause of staining before proceeding with any cleaning
         operation.

3.02 ERECTION, INSTALLATION, APPLICATION

    NOTE:  THE FOLLOWING TREATMENTS SHOULD BE USED BY TRAINED AND
    EXPERIENCED PERSONNEL.  IMPROPER USE MAY RESULT IN BLEACHING
    THE TERRAZZO MATRIX, IF A COLOR DYE WAS ADDED AT THE TIME OF
    INSTALLATION.  TEST BEFORE PROCEEDING.

    A.   Dissolve 2 pounds of trisodium phosphate (TSP) crystals
         in 1 gallon of hot water.

    B.   Mix 12 oz. of chlorinated lime to a paste in a shallow
         enameled pan; Add water slowly and mash the lumps until
         the paste is smooth.

    C.   Pour the chlorinated lime mix and the trisodium phosphate
         solution into a 2-gallon stoneware jar and add water to
         fill the jar.

    D.   Stir the mixture well, cover the jar and let the lime
         settle.

         CAUTION:  This mixture is a strong bleaching agent and is
         corrosive to metals.  Take special care not to drop any
         on colored fabrics or metal fixtures.

    E.   Mix the liquid with enough filler material such as
         powdered talc to make a thick paste.

    F.   Trowel the paste on to the surface in a 1/4 inch layer
         using a wood or plastic spatula and allow to dry.

    G.   When the poultice has dried, brush or scrape it off with
         a wooden paddle or trowel.  

    H.   Thoroughly rinse the area with clean, clear water and
         blot dry with clean towels.

                             END OF SECTION