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Historic Preservation - Technical Procedures

Spectitle:

Removing Oil And Tar Stains From Brick Masonry

Procedure code:

0421108R

Source:

Tech Notes On Brick Construction - 20

Division:

Masonry

Section:

Brick Unit Masonry

Last Modified:

08/09/2012

Details:

Removing Oil And Tar Stains From Brick Masonry



REMOVING OIL AND TAR STAINS FROM BRI= CK MASONRY


THE CLEANING OR REMOVAL OF STAINS FROM BRICK MAY INVOLVE THE USE
OF LIQUIDS, DETERGENTS OR SOLVENTS WHICH MAY RUN OFF ON ADJACENT
MATERIAL, DISCOLOR THE BRICK OR DRIVE THE STAINS DEEPER INTO POROUS BRICKS.  USE THE PRODUCTS AND TECHNIQUES DESCRIBED HERE ONLY FOR
THE COMBINATIONS OF DIRT/STAIN AND STONE SPECIFIED.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing heavy oil
         and/or tar stains from brick masonry.

    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).=0CPART 2---= PRODUCTS

2.01 MANUFACTURERS

    A.  Diedrich Technologies, Inc.
         www.diedrichtechnologies.com
         
    B.  ProSoCo, Inc.
         www.prosoco.com
         
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.   For Tar:

         1.   Dry ice or compressed CO2

    B.   For Oil and Residual Tar Stains:

         1.   Commercial cleaner such as "Diedrich ASPIR Solv" (Diedrich Technologies, Inc.),
              "Sure Klean Asphalt and Tar Remover" (ProSoCo,
              Inc.), or approved equal.

              -OR-

              For Poulticing:

              a.   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.

                   -OR-
                   Trichloroethylene (highly refined solvent):

                   CAUTION:  TRICHLOROETHYLENE IS HIGHLY TOXIC
                   AND MAY REACT WITH STRONG ALKALIS SUCH AS
                   FRESH CONCRETE TO FORM DANGEROUS GASES.

                   1)   Other chemical or common names include
                        Ethinyl trichloride.

                   2)   Potential Hazards:  TOXIC.

                   3)   Available from automotive supply
                        distributor, chemical supply house (both
                        commercial and scientific), dry cleaning
                        supply distributor, paint store,
                        photographic supply distributor (not
                        camera shop), or printer's supply
                        distributor.

              b.   White absorbent material (molding plaster,
                   untreated white flour, white tissue, paper
                   towels, powdered chalk, talc, fullers earth or
                   laundry whiting).

              c.   Plastic sheeting

         2.   Mineral water

         3.   Clean dry towels for blotting the area after
              treatment

         4.   White vinegar or commercial neutralizer such as
              "Sure Klean Masonry Restorer" (ProSoCo, Inc.), 101
              Masonry Restorer/Cleaner (Diedrich Chemicals), or
              approved equal.

    C.   Clean potable water

2.03 EQUIPMENT

    A.   Rubber hammer

    B.   Putty knife

    C.   Glass or ceramic container for mixing the solution

    D.   Wooden utensil for stirring the ingredients

    E.   Wood or plastic spatula

    F.   Stiff bristle brush (non-metallic)

    G.   Masking tape


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    NOTE:  TEST CLEAN A SMALL AREA BEFORE ATTEMPTING TO CLEAN
    LARGE AREAS.

    A.   For Tar:

         1.   Apply dry ice or compressed CO2 to the tar to make
              it brittle.

         2.   Tap the tar lightly with a small rubber hammer.

         3.   Using a putty knife, pry off loosened pieces of tar
              from the surface.

         4.   Thoroughly rinse the surface with clean, clear
              water and allow to dry.
    B.   For Oil and Residual Staining from Tar:

         1.   Apply a commercial cleaner directly to the surface.

              a.   Apply cleaner using a stiff bristle brush
                   following manufacturer's instructions.

              b.   Allow the mixture to remain on the stain for
                   period of time as recommended by manufacturer.

              c.   Thoroughly rinse the surface with clean, clear
                   water and allow to dry.

              d.   Repeat the process as necessary to achieve the
                   desired level of cleanliness.

              -OR-

              Apply a poultice containing a chemical solvent.

              a.   Thoroughly rinse the area to be treated with
                   mineral water.

              b.   Mix naphtha (mineral spirits) or
                   trichloroethylene with filler material to
                   achieve a thick paste.

              c.   Using a wooden or plastic spatula, apply the
                   paste to the stained surface in layers no more
                   than 1/4 inch thick.  The poultice should
                   extend well beyond the stain to prevent
                   forcing the stain into previously clean stone.

              d.   Check the coating for air pockets or voids.

              e.   Cover the poultice with plastic sheeting and
                   seal with masking tape.

              f.   Let set for 48 hours (unless otherwise
                   specified).

              g.   After set period, dampen the poultice with
                   mineral water.

              h.   Remove the poultice with a wooden or plastic
                   spatula to avoid scratching the surface.

              i.   Thoroughly rinse the cleaned area with mineral
                   water, blot with clean towels and allow the
                   surface to dry.

              j.   Repeat the process as necessary to remove any
                   remaining residue until the desired level of
                   cleanliness is achieved.  

         2.   If acid or commercial cleaner is used, neutralize
              the surface using white vinegar or a proprietary
              chemical neutralizer.  A neutral pH (7 pH) should
              be achieved.

              a.   Allow neutralizer to stand on wall about three
                   minutes before rinsing.  DO NOT LET IT DRY!

              b.   Thoroughly rinse the surface with clean, clear
                   water.

              c.   Test the pH with litmus paper or
                   phenolphthalein:

                   1)   Dissolve a 2" piece of phenolphthalein in
                        denatured alcohol.  

                   2)   Brush the solution onto the surface.  If
                        it turns a shade from pink to magenta
                        there is still chemical residue.  

              d.   Continue to neutralize the surface and test
                   until there is no color change in the
                   phenolphthalein solution or the litmus paper
                   registers neutral.

                         END OF SECTION
 


oil, tar, oil on brick, tar on brick, oil stains, tar stains