- Procedure code:
- National Capitol Region Specifications
- Last Modified:
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:
- Safety Precautions
- Historic Structures Precautions
- Quality Assurance
- Delivery, Storage and Handling
- Project/Site Conditions
- Sequencing and Scheduling
- 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 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.
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
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.