Removing Soluble Salts From Limestone
- Procedure code:
- Hsr - Federal Bldg/P.O., Wash, Dc - Bldg Conservation Tech
- Last Modified:
REMOVING SOLUBLE SALTS FROM LIMESTONE USING A POULTICE
A. This procedure includes guidance on removing soluble
salts from limestone.
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).
C. For general information on the characteristics, uses and
problems associated with limestone, see 04460-01-S.
A. Distilled water
B. Paper pulp made by boiling good quality blotting paper
with distilled water and beating it until completely
disintegrated and cellulose fibers mat together to form
A. Stiff bristle brushes (non-metallic)
3.01 ERECTION, INSTALLATION, APPLICATION
A. Clean stone of all debris, dust, oil, salt crystals, etc.
by brushing with a stiff fiber bristle brush or by
B. Thoroughly wet stone with clean, clear water just prior
to applying poultice.
C. Apply wet paper pulp (soaked in distilled water) to the
stone completely covering and concealing all voids and
D. Keep pulp in position for three weeks or until completely
dried and removed easily.
E. After carefully removing the dried pulp, brush or vacuum to remove all salt crystals formed on
F. Apply fresh pulp as described in Section B through D
G. Brush or vacuum to remove all salt crystals formed on
H. If high concentrations of soluble salts remain in the
stone, repeat applications of poultice.
END OF SECTION