Historic Preservation - Technical Procedures
- Cleaning And Painting Steel Windows
- Procedure code:
- National Capitol Region Specifications
- Doors And Windows
- Metal Windows
- Last Modified:
- Cleaning And Painting Steel Windows
- Last Modified:
CLEANING AND PAINTING STEEL WINDOWS
BEFORE UNDERTAKING ANY PROJECT INVOLVING PAINT REMOVAL, APPLICABLE
STATE AND FEDERAL LAWS ON LEAD PAINT ABATEMENT AND DISPOSAL MUST
BE TAKEN INTO ACCOUNT AND CAREFULLY FOLLOWED. STATE AND FEDERAL
REQUIREMENTS MAY AFFECT OPTIONS AVAILABLE TO OWNERS ON BOTH PAINT
REMOVAL AND REPAINTING. THESE LAWS, AS WELL AS ANY REQUIREMENTS
PROHIBITING VOLATILE ORGANIC COMPOUNDS (VOCs), SHOULD BE REQUESTED
FROM THE STATE HISTORIC PRESERVATION OFFICER IN EACH STATE. (From
Preservation Brief 28, "Painting Historic Interiors"). REGULATORY INFORMATION MAY
ALSO BE REQUESTED FROM THE ENVIRONMENTAL PROTECTION AGENCY (EPA)
REGIONAL OFFICE AND/OR THE STATE OFFICE OF ENVIRONMENTAL QUALITY.
A. This procedure includes guidance on the cleaning and
painting of exterior steel windows. It also includes
information on removing all deteriorated caulking and
recaulking all joints between metal elements and masonry.
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. Devcon Corporation
A. Metal Filler: Steel filled two-part epoxy metal filler,
putty grade such as "Plastic Steel Putty A" (Devcon
Corporation), or approved equal.
B. Dry Grit Blasting: Fine grit No. 16 at 80-100 psi.
C. Paint for Metal: 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 the highest quality of an approved
1. Colors: Each primer coat to be clearly different in
color; base coat to be clearly different from
primer and finish coat; finish coat to match
existing or as approved by RHPO.
2. Dry Film Thickness: Primer, base and finish, each
D. Sealant Backer Rod: Polyethylene compressible rod 50%
larger in diameter than joint.
E. Sealant: Polysulfide sealant, white or light grey in
F. Mineral Spirits:
1. A petroleum distillate that is used especially as a
paint or varnish thinner.
2. Other chemical or common names include Benzine* (not
Benzene); Naphtha*; Petroleum spirits*; Solvent
3. Potential Hazards: TOXIC AND FLAMMABLE.
4. Safety Precautions:
a. AVOID REPEATED OR PROLONGED SKIN CONTACT.
b. ALWAYS wear rubber gloves when handling
c. If any chemical is splashed onto the skin,
wash immediately with soap and water.
5. Available from construction specialties
distributor, hardware store, paint store, or
printer's supply distributor.
B. Joint tools
C. Putty knife
D. Stiff, bristle brushes
E. Paint brushes
1. Enclose any dry grit blasting work areas with
temporary scaffolding or framework sufficient to
support tarpaulin enclosure to prevent escape of
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.
B. Surface Preparation:
1. Determine surfaces to which paint is to be applied
are even, smooth, sound, clean, dry and free from
defects affecting proper application. Report
defective surfaces to Contracting Officer.
2. All painting should be executed at a temperature
range of 50 to 80 F, at a relative humidity below
3.02 ERECTION, INSTALLATION, APPLICATION
A. Remove all paint to bare metal from the surface of the
frames and sash. Restore sash to full operation.
B. Paint removal may be done by dry grit blasting, scraping
or sanding. See also 05010-05-R for additional guidance
on paint removal from steel.
C. Remove, by hand, all caulking between metal and masonry.
D. Clean off dirt and grease by rubbing the surface with
mineral spirits. Remove residual grit from all surfaces
by air blasting.
E. Seal all open joints between metal elements and masonry
with backer rods and sealant. Joints shall be concave
with smooth finish. Do not allow sealant to extend over
the edges of the metal or the face of the stone. See
also 07900-01-R for guidance on replacing joint sealants
between window frames and masonry.
F. Prime all metal within two hours of cleaning. Use color
distinct from finish color.
G. 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.
A. Cleanup: Remove all paint where it has spilled or
spattered. Use paint thinner or solvent as necessary to
effect complete removal.
END OF SECTION