Preserving And Restoring The Aluminum Finish Of Decorative Architectural Features
- Procedure code:
- Developed For Hspg (Nps - Sero)
- Metal Materials
- Last Modified:
PRESERVING AND RESTORING THE BARE ALUMINUM FINISH OF DECORATIVE
A. This procedure provides general guidelines for preserving
and restoring the bare aluminum surface finish of
decorative aluminum architectural features.
B. Decorative aluminum architectural features (bare,
anodized, and conversion coatings) are frequently found
with a variety of tooled finishes. Some types of
aluminum finish textures found in historic buildings
include the following: Embossed, sandblasted, wire-
brushed or satin, or buffed/polished.
C. The best method of preserving the finish involves the
application of a protective coating of lacquer or wax to
prevent dirt and grime from accumulating.
D. 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).
E. For general information on the characteristics, uses and
problems associated with aluminum, see 05010-08-S.
A. Technical Report #C-6: "Aluminum and its Alloys," The
Aluminum Association, September 1978, fourth printing,
B. Technical Report #92: "Care of Aluminum," The Aluminum
Association, February 1983.
C. "Metal's in America's Historic Buildings: Uses and
Preservation Treatments", U.S. Department of Interior -
National Park Service - Preservation Assistance Division,
Chapters 8 and 18, Revised 1993.
D. Aluminum Association, 900 19th Street NW, Ste. 310,
Washington, DC 20006
A. To clean a waxed surface simply wash with clean, clear
water and wipe with clean cloth.
B. To remove yellowed wax, apply appropriate solvent with a
clean cloth. If necessary, wash surface with mild soap
and water and reapply wax after surface has dried.
C. Aluminum architectural elements should be protected by a
non-absorptive, insulative coating to prevent direct
contact with corrosive agents.
D. Aluminum architectural elements should be protected from
rainwater run-off from wood and copper roofs and copper
A. S.C. Johnson & Son, Inc.
Racine, Wisconsin 53405
B. E.I. duPont de Nemours & Co., Inc.
1007 Market St.
Wilmington, Delaware 19898
A. Methacrylate type lacquer such as "DuPont 1234 or DuPont
RK 935" (E.I. duPont de Nemours & Co.), or approved
B. Ground pumice
C. Soft bristle brushes
D. 00 to 0000 stainless steel wool
E. Wax, most types including automotive and floor waxes
without cleaners or abrasives such as "Beautiflor Liquid
Wax No. 5951" and "Wax Emulsion" (S.C. Johnson & Son,
Inc.), or "Dupont 7 New Car Wax" (E.I. duPont de Nemours
& Co.), or approved equal.
A. Examine the surface to determine the extent of damage.
1. If the damage is not severe, the aluminum elements
can be protected from abrasion or erosion by
coatings of lacquer, wax or suitable paint.
2. If the damage is extensive, the deteriorated
section(s) must be replaced with new metal of a
heavier gauge, but which matches the existing in
color, appearance, etc.
A. Verify the finish prior to making repairs.
B. Remove all oil, dirt, and other debris from the surface.
3.03 ERECTION, INSTALLATION, APPLICATION
A. Restoring the surfaces of decorative aluminum
CAUTION: DO NOT RESTORE ANODIZED OR CONVERSION COATINGS
USING THESE METHODS - THEY WILL BE DAMAGED.
1. Apply wax or lacquer according to the surface
texture desired (see 1a-1d below). DO NOT allow
coating to build up and discolor surface texture.
a. For an embossed texture: Using a soft bristle
brush, apply finish compound of ground pumice
b. For a sandblasted texture: Use light
sandblasting (only under factory conditions).
c. For a wirebrush or satin texture: Using a
soft bristle brush, apply a finish compound of
ground pumice and water.
d. For a buffed or polished finish: Using fine
stainless steel wool (0000 to 00), hand rub
the surface with ground pumice.
2. Follow manufacturer's recommendations and
procedures. Buff accordingly to achieve
END OF SECTION