Removing Salts From Granite
- Procedure code:
- National Capitol Region Specifications
- Last Modified:
REMOVING SALTS FROM GRANITE
A. This procedure includes guidance on the removal of
surface dirt on all areas granite, and rinsing of ice-
melting salts that have caused surface-erosion of the
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).
1.02 QUALITY ASSURANCE
1. Contractor performing the work shall have a minimum
of 5 years experience in masonry restoration work
of the type described for this project.
2. If requested by the Owner, furnish a statement of
the experience and qualifications of the firm and
of the key personnel who will work on this project.
Include the names and addresses of successful
projects completed, and for each, the name and
address of the owner and the architect.
B. Reference Standards:
1. Secretary of the Interior's "Standards for
2. Preservation Brief No. 1, "The Cleaning and
Waterproofing of Historic Masonry Buildings".
C. Test Panels: Each alternative method for each type of
A. Clean, potable water
A. Pressure water rinsing equipment (measuring between 100
and 400 psi for low-pressure; between 400 and 800 psi for
B. Fan-type spray tips (25 degree fan spray)
C. Stiff fiber-bristle brushes
1. This work should be tested in conjunction with
water soaking of other stone surfaces.
2. Joints should be tight to ensure protection of
interior wall finishes.
3.02 ERECTION, INSTALLATION, APPLICATION
A. General rinsing of granite surface: Maximum 800 PSI, 5-
10 GPM, 25 fan angle, not less than 6" from surface, at
an angle of 45 to 90 from wall surface.
B. Salt Removal:
1. Use water soaking method employing finely misted
sprays from full flow nozzles, 10-50 PSI per
2. Soak for four hour period followed by 500 PSI
END OF SECTION