Repairing Spalled Granite Using Epoxy Adhesive
- Procedure code:
- National Capitol Region Specifications
- Last Modified:
REPAIRING SPALLED GRANITE USING EPOXY RESIN
A. This procedure includes guidance on repairing minor
cracks and spalls in granite. This includes those
smaller than 6"x6". For larger fragments, see 04465-28-
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
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).
A. Product Data: Submit manufacturer's product literature
for epoxy adhesives or resins.
1. Submit samples of dowels for patch anchorage.
2. Sample Stone Repair: Reattach stone fragments and
patch stone at locations selected by the RHPO using
methods specified. Provide one sample each
A. Akemi Plastics, Inc.
B. Sika Corporaton
A. Epoxy Based Stone Repair Adhesive, such as "Akepox"
(various "Akepox" products from Akemi), "Sikadur Hi-Mod" (Sika
Corporation), or approved equal.
B. Clean, soft cloths
C. Acetone (C3H6O):
1. A volatile fragrant flammable liquid ketone used
chiefly as a solvent and in organic synthesis.
2. Other chemical or common names include Dimethyl
3. Potential Hazards: VOLATILE AND FLAMMABLE SOLVENT
4. Available from chemical supply house or hardware
D. Clean, potable water
A. Stiff natural bristle brush
D. Putty knife
A. Surface Preparation: Temporarily remove and store light
fixtures, mounting brackets, conduit, signs and other
building accessories to facilitate the restoration work.
Reinstall all removed items.
3.02 ERECTION, INSTALLATION, APPLICATION
A. Carefully remove loose stone fragments from building.
Re-use all pieces of broken stone that are in sound
condition, without serious cracks or flaws.
B. Clean any exposed metal anchors of all corrosion by
scraping and brushing with stiff wire brushes.
C. Clean surfaces to be laminated of grease and dust.
Surfaces should also be dry.
D. Mix hardener with mastic as per manufacturer's
E. Apply adhesive evenly and completely to surfaces to be
laminated. Set stone while adhesive is still tacky.
Secure stone fragments in place against movement until
adhesive is cured.
F. Clean any residual adhesive from the stone with acetone.
G. Pieces larger than 6"x6" should be further anchored with
rods drilled through the fragment and into the back-up
stone. See 04465-28-R.
END OF SECTION