Historic Preservation - Technical Procedures
Stripping Built-Up Floor Coatings From Terrazzo
National Capitol Region Specifications
Stripping Built-Up Floor Coatings From Terrazzo
STRIPPING BUILT-UP COATINGS FROM TERRAZZO
A. This procedure includes guidance on removing built-up
floor coatings from terrazzo floors.
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. National Terrazzo and Mosaic Association, Inc.(NTMA),
3166 Des Plaines Avenue, Ste. 132, Des Plaines, IL
60018, 800/323-9736 or 708/635-7744, FAX (708) 635-9127.
1.03 SYSTEM DESCRIPTION
A. Performance Requirements: The objectives for terrazzo
cleaning are to remove dirt, grime and coatings from the
surfaces without damaging the underlying material and to
give all the terrazzo a clean uniform appearance without
1. Sample panels for cleaning and terrazzo patching
shall be prepared for approval and shall establish
a standard for all terrazzo work. The locations and
types of control samples are to be indicated on a
plan, with a photograph of each control sample to
be submitted to the Contracting Officer's
representative. No work shall commence until
written approval for the control samples has been
obtained from the Contracting Officer's
2. The Contractor shall clean sample panels 2'-0" by
2'-0" in area, on each color and type of terrazzo,
for approval by the Contracting Officer's
representative. Locations of sample panels to be
selected by the Contracting Officer's
1.05 QUALITY ASSURANCE
A. Regulatory Requirements:
1. Comply with specified provisions and
recommendations of the National Terrazzo and Mosaic
Association, Inc. (NTMA Standards).
2. Comply with municipal and Federal regulations
governing all work included in this section and
including, but not limited to, cleaning, waste
disposal and protection to adjacent properties.
3. Contractor: The work shall be performed by a firm
possessing a minimum of five (5) years of
specialized experience in the restoration and
cleaning of historic architectural terrazzo,
similar to that which is required in this project.
The Contractor shall submit to the Contracting
Officer's representative references of previous
work, justifying the firm's experience. The
Contracting Officer's representative reserves the
right to approve or disapprove the use of the
Contractor contingent upon their experience.
a. NOTE: The quality of the work is highly
dependent on the competence of the Contractor
because it is not possible to anticipate every
variation encountered int he surfaces, job
conditions and methods used.
4. Where current codes cannot be complied with, and/or
construction limitations (including deterioration
of existing substrate) are such that the intended
finish cannot be achieved, notify the Regional
Historic Preservation Officer (RHPO) for
clarification and/or decision prior to proceeding
with the work.
5. Mock-ups: Strip and clean 20 square feet of each
terrazzo type for review by RHPO before stripping
and cleaning all the terrazzo.
A. General Paint and Chemical Company
Division of Cotter and Company
Chicago IL 30314
A. Water: Potable, non-staining and free of oils, acids,
alkalis and organic matter.
B. Interior Terrazzo Floor Sealer: Colorless slip and stain
resistant non-penetrating sealer with pH factor between
7 and 10, that does not affect the color or physical
properties of the existing terrazzo surface.
C. Cleaning Agents - (Built-Up Coatings): A non-ammoniated
liquid wax stripper/floor cleaner, such as "Tru-Test
Floor Stripper FS10" (General Paint and Chemical
Company), or approved equal.
A. Wood scrapers
B. Fiber bristle brushes
1. Take all necessary precautions and measures to
protect all surrounding materials from damage that
might be incurred during the terrazzo restoration
work describe din this outline specification. Any
damage caused by the Contractor to other materials
is unacceptable and shall be repaired or replaced
by the Contractor to the satisfaction of the
Contracting Officer's representative, at not cost
to the Government.
2. Improper use of chemicals may constitute a health
hazard. Refer to manufacturer's Material Safety
Data Sheets for hazard data, special protection,
for use and precautions to be taken in handling and
storage. Comply with manufacturer's recommendations
for proper use of chemicals.
3.02 ERECTION, INSTALLATION, APPLICATION
A. Strip built-up floor coatings from the terrazzo flooring
by applying a dilute cleaner (such as Tru-Test Stripper
FS.10). Let dwell for 5 to 20 minutes depending on test
trial results, scrub with fiber bristle brush, a
mechanical floor machine, or white nylon pad, and rinse
with low pressure cold water (less than 100 psi).
B. Do not use metal brushes. Repeat application for stubborn
build up. Do not allow cleaner to dry on the floor. A
testing program monitored by the Contracting Officer's
representative should be undertaken to verify procedures,
methods and dwell times.
C. Apply penetrating type sealer to reduce the porosity of
the terrazzo and increase its resistance to acid and
alkalis. Follow manufacturer's instructions.
END OF SECTION