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Historic Preservation - Technical Procedures

Spectitle:

Removing Built-Up Coatings From Interior Marble

Procedure code:

0445501R

Source:

National Capitol Region Specifications - Cohen Building

Division:

Masonry

Section:

Marble

Last Modified:

07/02/2012

Details:

Removing Built-Up Coatings From Interior Marble



REMOVING BUILT-UP COATINGS FROM INTE= RIOR MARBLE


PART 1--- GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing built= -up
         coatings from interior marble surfaces, followed by
         general surface cleaning.  These coatings may include
         built-up splashed floor coatings and general soiling and
         staining.

    B.   Any use of cleaning products on historic materials should
         be based on results of a test area in an inconspicuous
         location working with the technical assistance of the
         product manufacturers to ensure compatib= ility with
         substrate and to avoid damage.  Adj= ust concentrations and
         dwell times according to each material and condition.

    C.   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).  


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.  Diedrich Technologies, Inc.
         www.diedrichtechnologies.com
         
    B.  ProSoCo, Inc.
         www.prosoco.com
         
2.02 MATERIALS

    A.   For General Staining: Use a poultice incorporating=
         surfactants and detergents for the removal of general
         staining, such as "Sure Klean Marble Poultice"(ProSoCo, Inc.), or
         "General Purpose Poultice" (Diedrich), or approved equal.

    B.   For removal of Built-up Stains: Use thixotropic alkali
         materials, such as "Sure Klean Liquid Marble Cleaner", or
         "Sure Klean 942 Limestone & Marble Cleaner" (ProSoCo, Inc.), or
         "910PM  Polished Marble" (Diedrich), or approved equal.
         
    C.   Liquid Strippable Masking Agent: Manufacturer's standard
         liquid, film forming, strippable masking material for
         protecting glass, metal and polished stone surfaces from
         damaging effect of acidic and alkaline masonry cleaners,
         such as "Sure Klean Strippable Masking" (ProSoCo, Inc.), or approved equal.

    D.   Plastic for covering poultice

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

2.03 EQUIPMENT

    A.   Brushes: Natural or synthetic fiber bristle only. The use of wire
         brushes or steel wool is not permitted.


    B.   Wood spatula


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:  Protect all adjacent surfaces using liquid
         strippable masking agent.

    B.   Surface Preparation:  Work to proceed from top of wall
         downwards. Work shall not be considered complete until
         the Contracting Officer or designated representative has
         so notified the contractor in writing.


3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Remove Built-Up Coatings:

         1.   Apply undiluted marble cleaner to the marble
              surface using a soft bristle synthetic brush (natural
              fibered brushes are not suitable).

         2.   Dwell time shall be approximately 20 to 60 minutes
              in accordance with approved test procedures, but do
              not allow the stripper to dry out. Before rinsing,
              scrub for five to ten minutes to loosen stubborn
              coatings.

         3.   Sponge rinse the surface thoroughly using fresh,
              clear water. Change the rinse water frequently.

         4.   Remove waste water as work progresses by wet vacuum
              or other appropriate means. Do not allow water to
              pond on the floor.

    B.   General Cleaning:

         1.   Prepare the cleaning poultice by mixing the liquid
              additive with the dry poultice (Fuller's earth) to
              a thick cream consistency. Mix thoroughly so that
              the poultice has a smooth even consistency.

         2.   Clean dirt or dust from the surface being treated
              prior to application of poultice.

         3.   Prewet marble and apply a 1/4" thick layer of
              poultice to the stained surface using a stainless
              steel trowel or other non-ferrous implement.

         4.   Cover the poultice with a plastic membrane and
              allow to dry 8 to 24 hours, depending on test
              samples.

         5.   Scrape the poultice from the masonry with a non-
              metallic implement and scrub with water and a non-metallic fiber
              bristle brush.

         6.   Rinse all traces of chemical residue with low
              pressurized cold water (300 psi) using spray
              nozzles with 15  to 20  wide nozzle tips. Nozzles
              shall be held perpendicular to the surface at a
              working distance of 1.5 to 2.5 feet. All pressure
              pumps shall be equipped with working pressure
              gauges.

 

        7.   Capture all runoff water and dispose of it properly. Do not allow the 

              runoff to collect on unprotected surfaces.

                         END OF SECTION
 


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