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Historic Preservation - Technical Procedures
Stripping And Repainting Iron And Steel Features
National Capitol Region Specifications - Agriculture Bldg
Stripping And Repainting Iron And Steel Features
STRIPPING AND REPAINTING IRON AND STEEL FEATURES
A. This procedure includes guidance on stripping iron and
steel of all paint build-up and repainting.
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. The Benjamin Moore Co.
51 Chestnut Ridge Road
Montvale, NJ 07645
B. Devcon Corporation
30 Endicott Street
Danvers, MA 01923
C. The Sherwin Williams Co.
101 Prospect Ave. N.W.
Cleveland, OH 44101
A. Metal Filler: Steel filled, two part, epoxy, metal
filler, putty grade such as "Plastic Steel" (Devcon
Corporation), or approved equal.
B. Paint for Metal: Alkyd resin, (Benjamin Moore), (Sherwin
Williams), or approved equal, designed specifically for
exterior metal application. Paint products shall be fresh
and well-ground; shall not settle readily, cake or
thicken in the container; shall be broken up readily with
a paddle to a smooth consistency and shall have easy
application properties. Other painting materials such as
linseed oil, turpentine, mineral spirits, and
miscellaneous thickeners, shall be of the highest quality
and of an approved manufacturer. See also 05010-13-S for
additional guidance on primers and paints for steel.
1. Primer: Compatible with top coats of paint; make
each coat clearly different in color.
2. Base and Finish: Alkyd resin semi-gloss: Benjamin
Moore or Sherwin Williams; make colors clearly
different from each other and primer.
3. Dry Film Thickness:
a. Primer: 2 mils.
b. Base and Finish Coats: 2 mils each.
C. Sealant Backer Rod: Polyethylene compressible rod, 50%
larger in diameter than the joint.
D. Sealant: Polyurethane sealant, color to match masonry.
A. Wire Brush: Non-ferrous metal brush such as brass.
B. Dry Grit Blasting: Fine grit at 80-100 psi.
C. Paint brushes
1. Enclose dry-grit blasting work areas with temporary
scaffolding or framework sufficient to support
tarpaulin enclosure to prevent escape of abrasive.
2. Shield adjacent masonry and glass with a temporary
covering of cardboard or fiberboard held in place
with heavy-duty strapping tape or wood bracing.
Use drop cloths or other suitable coverings as
appropriate to protect materials from paint drips
B. Surface Preparation:
1. Determine that surfaces to which paint is to be
applied are even, smooth, sound, clean, dry and
free from defects affecting proper application.
Correct or report defective surfaces to Contracting
2. Execute all painting in a temperature range of 50
- 85 F, at a relative humidity below 60%. Do not
apply paint on surface in direct sunlight or in
spaces where dust is being generated which would
speck the finish.
3.02 ERECTION, INSTALLATION, APPLICATION
A. Remove all paint to bare metal from iron and steel
surfaces using mechanical methods such as scraping,
sanding or dry grit blasting. See also 05010-05-R for
additional guidance on paint removal from steel.
B. Remove dirt and grease and abrade remainder of the
surface with wire brushing. Remove residual grit from all
surfaces by air blasting.
C. Seal all open joints between metal elements and masonry
with backer rods and sealant. Joint shall be concave with
smooth finish. Do not allow sealant to extend over the
edges of the metal or the face of the stone.
D. Replace or repair any badly deteriorated pieces of
metalwork to match the original.
E. Fill small holes, depressions and cracks with metal
filler following the manufacturer's written directions.
Finish all filled areas by sanding flush, after curing
time has elapsed.
D. Prime all metal within two hours of cleaning, down to
bare metal using a color obviously different from the
F. Paint to match color specified by the RHPO.
1. Brush-apply material evenly without runs, sags, or
other defects. Work each coat onto the material
being coated at an average rate of coverage
recommended in manufacturer's printed instructions.
2. Cover surfaces completely to provide uniform color
and appearance with a minimum of dry, film
thickness of 2 mils.
3. Make edges of paint, adjoining other materials or
colors, sharp and clean and without overlaps.
4. Apply additional coats when undercoats, stains, or
other conditions show through final coat of paint,
until paint film is of uniform finish, color and
appearance. Insure that corners, edges, crevices
and exposed fasteners receive a dry film thickness
equal to that of flat surfaces.
5. Each coat of paint is to be slightly darker than
the preceding coat with the final coat exactly
matching the accepted samples.
G. Drying Time: Minimum time, as recommended. Do not apply
subsequent coats until the undercoat is thoroughly dry.
Sand between coats to produce even and smooth surfaces.
A. Remove all paint where it has spilled or spattered. Do
not drip any paint on stone. Use paint thinner or solvent
as necessary to effect complete removal.
END OF SECTION