U.S. General Services Administration
Technical Procedures Disclaimer
Prior to inclusion in GSA’s library of procedures, documents are reviewed by one or more qualified preservation specialists for general consistency with the Secretary of Interior Standards for rehabilitating historic buildings as understood at the time the procedure is added to the library. All specifications require project-specific editing and professional judgement regarding the applicability of a procedure to a particular building, project or location. References to products and suppliers are to serve as a general guideline and do not constitute a federal endorsement or determination that a product or method is the best or most current alternative, remains available, or is compliant with current environmental regulations and safety standards. The library of procedures is intended to serve as a resource, not a substitute, for specification development by a qualified preservation professional.
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We’ve reviewed these procedures for general consistency with federal standards for rehabilitating historic buildings and provide them only as a reference. Specifications should only be applied under the guidance of a qualified preservation professional who can assess the applicability of a procedure to a particular building, project or location. References to products and suppliers serve as general guidelines and do not constitute a federal endorsement nor a determination that a product or method is the best alternative or compliant with current environmental regulations and safety standards.
RESECURING LOOSE MARBLE FRAGMENTS
PART 1–GENERAL
1.01 SUMMARY
A. This procedure includes guidance on re-securing loose
marble wall fragments on building exterior or building interior locations.
The fragments are of a small size and weight for which the adhesive chosen will have sufficient strength to hold the stone securely.
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: Review the manufacturer’s product literature and follow these instructions.
PART 2–PRODUCTS
2.01 MANUFACTURERS
A. Axson North America. Wood & Stone Company.
www.axson-na.com
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:
1.For building exterior work, see Axson North America, Wood & Stone Company: Epoxy Stone Adhesives: Akabond 600 Flowing, Akabond 621 KG. Review product literature carefully in making selection. Or approved equal.
2. For building interior work, see Axson North Americ, Wood & Stone Company: Polyester Adhesives; review the product range carefully in making selection. 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.