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Historic Preservation - Technical Procedures

Spectitle:

Repolishing Granite

Procedure code:

0446525R

Source:

National Capitol Region Specifications

Division:

Masonry

Section:

Granite

Last Modified:

06/14/2012

Details:

Repolishing Granite



RE-POLISHING GRANITE


PART 1---GENERAL

1.01     SUMMARY

        A.   This procedure includes guidance on re-polishing eroded
             areas in exterior granite.

        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     SUBMITTALS

        A.   Product Data:  Submit manufacturer's technical data for
             each product indicated including recommendations for
             their application and use.  Include test reports and
             certifications substantiating that products comply with
             requirements.

1.03     PROJECT/SITE CONDITIONS

        A.   Environmental Requirements:  Perform work only in dry and
             otherwise favorable weather conditions.  Protect repaired
             stone against freezing or excessively rapid drying for at
             least 48 hours after being laid; no masonry shall be laid
             when temperature is below 32 degrees F on a rising thermometer or
             below 40 degrees F on a falling thermometer.

        B.   Existing Conditions:  Contractor shall take whatever
             precautions are necessary to protect the existing
             building from damage resulting from work under this
             section.


PART 2---PRODUCTS

2.01     MATERIALS

        A.   Grinder with silicone carbide grinding stones or diamond
             disks.

        B.   Aluminum oxide polishing compound

        C.   Felt pads

        D.   Clean, soft cloths

        E.   Clean, potable water


PART 3---EXECUTION

3.01     ERECTION, INSTALLATION, APPLICATION
             
        NOTE: THIS WORK SHALL ONLY BE PERFORMED BY A SKILLED GRANITE
        REFINISHING CONTRACTOR.
                 
        A.   Grind granite down until an even plane is achieved.
             Feather out to unaffected surface as required to avoid
             granite having dished appearance.  Use right angle water
             feed grinder with successively finer diamond disks (#60
             to #3500) or silicon carbide grinding stones (36 to 400
             grit).
                 
        B.   Polish to match existing sheet of granite.  Use acid free
             aluminum oxide polishing compound with felt pad.

             CAUTION:  POLISHING COMPOUNDS CONTAINING FLUORIC ACID
             WILL EVENTUALLY ETCH THE GRANITE SURFACE, RESULTING IN A
             DIMINUTION OF GLOSS.

                         END OF SECTION
 


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