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Historic Preservation - Technical Procedures

Spectitle:

Cleaning And Stripping Paint From Plaster Surfaces

Procedure code:

0920008R

Source:

Tacoma Union Station Courthouse/Tacoma, Wa - Gsa/Pbs

Division:

Finishes

Section:

Lath & Plaster

Last Modified:

02/24/2012

Details:

Cleaning And Stripping Paint From Plaster Surfaces



CLEANING AND STRIPPING PAINT FROM PLASTER SURFACES


BEFORE UNDERTAKING ANY PROJECT INVOLVING PAINT REMOVAL, APPLICABLE
STATE AND FEDERAL LAWS ON LEAD PAINT ABATEMENT AND DISPOSAL MUST
BE
TAKEN INTO ACCOUNT AND CAREFULLY FOLLOWED.  STATE AND FEDERAL
REQUIREMENTS MAY AFFECT OPTIONS AVAILABLE TO OWNERS ON BOTH PAINT
REMOVAL AND REPAINTING.  THESE LAWS, AS WELL AS ANY REQUIREMENTS
PROHIBITING VOLATILE ORGANIC COMPOUNDS (VOCs), SHOULD BE REQUESTED
FROM THE STATE HISTORIC PRESERVATION OFFICER IN EACH STATE.  (From
Preservation Brief 28, "Painting Historic Interiors").  REGULATORY
INFORMATION MAY ALSO BE REQUESTED FROM THE ENVIRONMENTAL
PROTECTION
AGENCY (EPA) REGIONAL OFFICE AND/OR THE STATE OFFICE OF
ENVIRONMENTAL QUALITY.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on cleaning and
         chemically removing paint from existing plaster 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 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).


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Diedrich Technologies, Inc.
         7373 South 6th Street
         Oak Creek (Milwaukee), WI  53154
         800/323-3565 or 414/764-0058

    B.   Red Devil, Inc.
         2400 Vauxhall Road
         Union, NJ  07083-1933
         800/423-3845 or 201/688-6900

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.   Trisodium Phosphate:  

         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, such as that manufactured by Red
              Devil, Inc.

         2.   Other chemical or common names include Sodium
              Orthophosphate; Tribasic sodium phosphate;
              Trisodium orthophosphate; TSP*; Phosphate of soda*.

         3.   Potential Hazards:  CORROSIVE TO FLESH.

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

    B.   Commercial paint remover, such as "Diedrich 400 - Enviro-
         Safe Strip" (Diedrich Technologies, Inc.), or approved
         equal.

    C.   For Glaze Remover:  

         1.   Denatured Alcohol:

              a.   Other chemical or common names include
                   Methylated spirit*.

              b.   Potential hazards:  TOXIC AND FLAMMABLE.

              c.   Available from hardware store, paint store or
                   printer's supply distributor.

              d.   Denatured alcohol should be a satisfactory
                   substitute for ethyl alcohol for stain
                   removing purposes.

         2.   Mineral Spirits:

              a.   A petroleum distillate that is used especially
                   as a paint or varnish thinner.

              b.   Other chemical or common names include
                   Benzine* (not Benzene); Naphtha*; Petroleum
                   spirits*; Solvent naphtha*.

              c.   Potential Hazards:  TOXIC AND FLAMMABLE.

              d.   Safety Precautions:

                   1)   AVOID REPEATED OR PROLONGED SKIN CONTACT.

                   2)   ALWAYS wear rubber gloves when handling
                        mineral spirits.

                   3)   If any chemical is splashed onto the
                        skin, wash immediately with soap and
                        water.

              e.   Available from construction specialties
                   distributor, hardware store, paint store, or
                   printer's supply distributor.

         3.   Acetone (C3H6O):

              a.   A volatile fragrant flammable liquid ketone
                   used chiefly as a solvent and in organic
                   synthesis and found abnormally in urine.

              b.   Other chemical or common names include
                   Dimethyl ketone; Propanone

              c.   Potential Hazards:  VOLATILE AND FLAMMABLE
                   SOLVENT

              d.   Available from chemical supply house or
                   hardware store.

    D.   Clean, potable water

2.03 EQUIPMENT

    A.   Clean, dry cloths

    B.   Sponge or heavy-nap cloth

    C.   Soft, fiber bristle brushes

    D.   Putty knife


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:

         1.   Protect surrounding surfaces from damaged resulting
              from chemical cleaning and paint stripping work.

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

         3.   Develop a work plan indicating recommended
              treatments for surfaces/areas.

    B.   Surface Preparation:  Prior to cleaning and stripping
         work, remove cellophane tape, masking tape, etc. from
         surface.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Cleaning Existing Plaster Surfaces:

         1.   Mix TSP with warm water to create cleaning
              solution.

         2.   Scrub surface with a cloth, sponge or soft-fibered
              brush and cleaning solution.

              a.   Proceed with cleaning and stripping in an
                   orderly manner; work from bottom to top of
                   each surface and from one end of each surface
                   to the other.

              b.   Perform each cleaning and stripping method
                   indicated in a manner which results in uniform
                   coverage of all surfaces, including corners,
                   moldings, interstices and which produces an
                   even effect without streaking or damage to
                   surfaces.

         3.   Sponge rinse surface thoroughly using clean water
              to completely remove chemical residue and soil.
              Change rinse water frequently.

              a.   Rinse off chemical residue and soil by working
                   upwards from bottom to top of each surface and
                   from one end of each surface to the other.

                   NOTE:  THERE IS SOME DIFFERENCE OF OPINION AS
                   TO WHETHER IT IS BEST TO WASH A WALL WORKING
                   FROM THE TOP DOWN OR FROM THE BOTTOM UP.
                   BOTTOM UP IS SAFER BECAUSE SOLUTION STREAKS
                   RUNNING DOWN ON A DIRTY WALL CANNOT BE
                   REMOVED.  THE IMPORTANT THING IS TO WORK DRY
                   ENOUGH TO AVOID DRIPS.

         4.   Repeat process as required.

         5.   Wipe the surface with a dry clean cloth to prevent
              streaking.

    B.   Stripping Paint from Plaster Surfaces:

         1.   Carefully apply commercial stripper to painted
              surface with a brush.  Follow manufacturer's
              instructions and precautions.

         -OR-

              Prepare a glaze remover:  Mix 5 parts denatured
              alcohol, 3 parts mineral spirits and 1 part acetone
              and apply to the surface.

         2.   Allow commercial stripper or glaze remover to
              remain on surface for length of time recommended by
              manufacturer and required to emulsify paint build-
              up.

         3.   Carefully remove emulsified paint with a putty
              knife.

         4.   Repeat process as many times as required to remove
              paint build-up.

         5.   Neutralize chemical stripper by wiping surface with
              a cloth wet with clean water.  Change water
              frequently.

3.02 ADJUSTING/CLEANING

    A.   Upon completion of this work, all floors, walls and other
         adjacent surfaces that are stained, marred, or otherwise
         damaged by work under this section shall be cleaned and
         repaired and all work and the adjacent areas shall be
         left in a clean and perfect condition.

    B.   All completed work shall be adequately protected from
         damage by subsequent building operations and effects of
         weather.  Protection shall be by methods recommended by
         the manufacturer of installed materials and as approved
         by the RHPO.

                             END OF SECTION