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Historic Preservation - Technical Procedures

Spectitle:
Re-Securing Loose Marble Fragments

Procedure code:
0445521R

Source:
National Capitol Region Specifications

Division:
Masonry

Section:
Marble

Last Modified:
02/24/2012

Details:
Re-Securing Loose Marble Fragments



RE-SECURING LOOSE MARBLE FRAGMENTS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on re-securing loose
         marble wall fragments.

    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 PROJECT/SITE CONDITIONS

    A.   Existing Conditions: No stone work will be performed when
         the air temperature is 40 F and falling or when stone
         surface temperature is 40 F or below.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Akemi Plastics, Inc.
         Eaton Rapids, MI

2.02 MATERIALS

    A.   Stone: All loose stone in sound condition. Replacement
         marble to be identical in color, texture and type of
         existing marble.

    B.   Adhesives - Stone to Stone Repair: Two-part polyester
         resin adhesive, knife grade with a 15-30 minute cure at
         70 F which can be applied at temperatures as low as 20 F,
         and is limestone color such as "Akemi Limestone Super"
         light knife grade (Akemi Plastics, Inc.), or approved
         equal.

    C.   Water: Clean and free of deleterious amounts of oils,
         acids, alkalis and organic matter.

2.03 EQUIPMENT

    A.   Stiff, fiber bristle brushes

    B.   Trowels

    C.   Joint tools

    D.   Wood spatulas


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   Carefully remove loose marble fragments. Reuse all pieces
         of marble.

    B.   Clean any exposed metal conduit and anchors of all
         corrosion by scraping and brushing with stiff wire
         brushes. Replace any unsound anchors as necessary with
         new stainless steel anchors of same approximate size and
         shape. Bed new anchors in epoxy grout.

    C.   Clean both building marble and marble fragments of all
         loose debris and grease by brushing with stiff fiber
         bristle brush.

    D.   Coat marble surfaces with adhesive, completely filling
         all voids and covering all surfaces. Set marble while
         adhesive is still tacky, up to 15 minutes. Secure marble
         fragments in place against movement until adhesive has
         cured.

    E.   Clean any residual adhesive from the edges. Wet the
         marble and fill any chipped areas and edges with patching
         mortar. Avoid feather edging. Tool surface level with
         surrounding stone. Keep mortar damp (80-90% RH) for 72
         hours or until cured.

3.02 ADJUSTING/CLEANING

    A.   At the time of repairing, pointing and resetting the
         marble, immediately remove mortar, grout and adhesives
         from the face of the masonry.

    B.   Use only tools and equipment which are clean and free of
         hardened or partially hardened material.

    C.   Clean marble only with fiber bristle brushes and water.
         Use no acids, detergents, or other cleaning agents.

                         END OF SECTION