Removal Of Copper-Based Stains From Brick, Concrete & Limestone
- Procedure code:
- National Capitol Region Specifications - Cohen Building
- Unit Masonry
- Last Modified:
REMOVAL OF COPPER-BASED STAINS FROM BRICK, CONCRETE AND LIMESTONE
PART 1--- GENERAL
A. This procedure includes guidance on removing copper
staining on exterior brick, concrete and limestone.
1. Remove soiling, stains and crusts from the
limestone and granite without damaging underlying
material and to give all stone a clean, uniform
appearance without blotches, streaks or other
irregularities. Use the gentlest means to meet the
2. If the exterior masonry has been previously
subjected to inappropriately harsh and uneven
cleaning, it is expected that the cleaning will
reveal the original colors and textures of the
brick, but that it will not completely correct the
differential effects of the previous cleaning.
Clean brick to remove soiling, stains and crusts to
the extent feasible without further damaging 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).
A. Diedrich Technologies, Inc.
B. ProSoCo, Inc.
A. Copper-Based Stain Remover: Commercially available, two
part poultice cleaning system specifically designed to
remove green copper stains from masonry surfaces, such as
"Sure Klean T-515 Copper Stain Remover"(ProSoCo, Inc.),
or approved equal.
B. Liquid Strippable Masking Agent: Manufacturer's standard
liquid, film forming, strippable masking material for
protecting glass, metal and polished stone surfaces from
damaging effect of acidic and alkaline masonry cleaners,
such as "Sure Klean Strippable Masking" (ProSoCo, Inc.), or approved equal.
C. Plastic material for covering poultice
D. Water: Potable, non-staining and free of oils, acids,
alkalis and organic matter.
A. Brushes: Natural fiber bristle only. The use of wire
brushes or steel wool is not permitted.
B. Stainless steel trowel
C. Wood spatula
A. Protection: Protect from run-off the surfaces below the
sections of masonry to be cleaned of copper-based stains
using liquid strippable masking agent.
B. Surface Preparation:
1. Filter water with a 5 micron particulate filter
placed in line with the water supply. Replace the
filter as needed during the work.
2. Commence copper-based stain removal immediately
after cleaning of masonry (see 03710-15-R, 04211-
04-R and 04460-03-R for guidance on the general
cleaning of concrete, brick and limestone
3. The work shall proceed from the top of the wall
downward. Work shall not be considered complete
until the Contracting Officer of designated
representative has so notified the Contractor in
3.02 ERECTION, INSTALLATION, APPLICATION
A. Prepare the copper-based stain remover by mixing the
liquid additive with the dry poultice (Fuller's earth) to
a thick cream. Mix thoroughly so that poultice has a
smooth, even consistency.
B. Clean dirt or dust from surface being treated prior to
application of poultice.
C. Prewet masonry and apply a thick layer of poultice to
the stained surface using a stainless steel trowel or
other non-ferrous implement.
D. Cover the poultice with a plastic membrane and allow to
dry for 8 to 24 hours depending on test samples.
E. Scrape the poultice from the masonry with a non-metallic
implement and scrub with water and a fiber bristle brush.
F. Rinse all traces of chemical residue with pressurized
cold water. Rinse water pressure shall not exceed 300
psi, and shall be sprayed through nozzles fitted with 15
to 20 wide tips. Nozzles shall be held perpendicular to
the surface at a working distance of 1.5 to 2.5 feet. All
pressure pumps shall be equipped with working pressure
G. Repeat procedure if necessary to remove all traces of
END OF SECTION