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Historic Preservation - Technical Procedures

Spectitle:

Patching Chips And Small Holes In Granite

Procedure code:

0446510R

Source:

Hsr - Departmental Auditorium Bldg/Wash, Dc - Grier, Brown..

Division:

Masonry

Section:

Granite

Last Modified:

06/14/2012

Details:

Patching Chips And Small Holes In Granite



PATCHING CHIPS AND SMALL HOLES IN GRANITE


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on patching small chips
         and holes in granite.  This may include patching small
         holes in granite left behind with the removal metal bolts
         and fasteners from the stone.

    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 REFERENCES

    A.  American Society for Testing and Materials (ASTM), 
         www.astm.org
        

PART 2---PRODUCTS

2.01 MATERIALS

    A.   Two part polyester resin adhesive colored to match
         existing granite such as "Akemi Transparent" knife grade
         (Akemi), or approved equal; 15-30 minute cure at 70
         degrees F.; can be applied at temperatures as low as 40
         degrees F.

    B.   Permanent coloring agent as required, compatible with
         adhesive, and as recommended by adhesive manufacturer.

    C.   Clean, potable water

2.02 EQUIPMENT

    A.   Stiff bristle brushes (natural fiber or nylon bristle)

    B.   Polyethylene plastic mixing vessel for mixing adhesives
         and patching mortar

    C.   Razor blade(s)


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   Remove loose dirt and debris from the hole and the
         surrounding stone surface using a stiff bristle brush.
         Flush with clean, potable water if necessary and allow to
         dry.

    B.   Mix patching material following manufacturer's
         instructions and recommendations.  Mix coloring agent
         with mastic before adding hardener.  Mixes should be
         tested to determine finish color after curing, to achieve
         best color match with surrounding stone.

    C.   Apply patching material to stone following manufacturer's
         instructions.

    D.   When the patching material becomes rubbery, carefully
         remove excess material using a razor blade.  Finish patch
         surface to match surrounding stone surfaces.

    E.   Any patches determined unacceptable will be removed and
         refilled as directed by the Regional Historic
         Preservation Officer.  Unacceptable patches include those
         showing separation at the edges and/or hairline cracking.

                         END OF SECTION
 


patching, chips, small holes, granite