Replicating Bronze Hardware
- Procedure code:
- National Capitol Region Specifications - Pres Ntbk Series
- Doors and Windows
- Last Modified:
REPLICATING BRONZE HARDWARE
A. This procedure includes guidance on replicating missing
or irreparably damaged bronze hardware at historic
buildings. The Contractor will fabricate custom castings
by making molds from existing, original pieces, or when
no original exists, from original drawings or photographs.
The more detailed the documentation, the better.
B. To get an estimate for replication, provide the
fabricator with close-up photographs and/or drawings
showing front and side views of the element(s), exact
dimensions, and any complex detailing. Ideally, a 35mm
camera, macro lens, and slow exposure should be used.
Architect/Engineering firms can be contacted to provide
photographs if your office does not have the needed
equipment. Provide a list of the quantity of each element
needed, since it will determine the unit cost.
C. 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. Samples: Submit one sample of each unique casting for
approval by Contracting Officer's representative prior to
proceeding with fabrication remaining elements listed in
scope of work.
A. Ball and Ball www.ballandball-us.com
D. Conant Metal & Light www.conantmetalandlight.com
E. Brian F. Leo www.brianfleo.com
(Also provides custom castings in aluminum, steel and other alloys)
3.01 ERECTION, INSTALLATION, APPLICATION
A. Design Requirements: Replace missing hardware with
replicas to match originals. Design(s) to be taken from:
1. Existing original hardware.
2. Original construction drawings.
3. Photographs of original hardware.
B. New elements must match originals in all respects,
including form, material, finish, and fineness of detail.
Use the casting and finishing methods which produce the
highest quality of detail. Sand casting is acceptable for
large, flat elements such as exterior grilles. Lost wax
casting (also known as 'investment' casting or 'ceramic
shell' casting) is required for finely detailed
C. The artisan is responsible for shrink factoring so that
the replacement element matches the dimensions of the
D. If no original elements exist, and original drawings or
specifications indicating the originally intended finish
are not available, fabricate new hardware to match the
original finish (color, texture, sheen) of other original
hardware in the building.