Restoration Of Ornamental Copper Sheetmetal Fascia & Roof Flashing

Procedure code:
762001S
Source:
Us Custom House, Portland, Or - Gsa/Facil Support Center
Division:
Thermal and Moisture Protection
Section:
Sheet Metal Flashing And Trim
Last Modified:
12/31/2014


RESTORATION OF ORNAMENTAL COPPER SHEETMETAL FASCIA & ROOF
FLASHING


PART 1---GENERAL

1.01 SUMMARY

A. This procedure includes guidance on restoring ornamental
sheetmetal, including facia, built-in eaves trough and
flashing.


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

3. Submittals

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).

1.02 REFERENCES

A. American Society for Testing and Materials (ASTM),
www.astm.org


B. American National Standards Institute, Inc. (ANSI), www.ansi.org


C. American Welding Society (AWS), "Soldering Handbook" (most
current version); www.aws.org

D. Sheet Metal and Air Conditioning Contractors National
Association, Inc. (www.SMACNA.org) Architectural Sheet Metal
Manual (most current version).

1.03 SUBMITTALS

A. Method for Stamped & Formed Ornament Fabrication:

1. Submit a written outline of proposed method of
custom fabrication of stamped or pressed sheet
replacement elements. Accompany with dies, models,
samples, or catalog illustrations as required to
demonstrate ability to produce acceptable metal
ornaments.

B. Samples:

1. One piece of a complete ornament assembly of formed
sheet replacement elements; to demonstrate
acceptable workmanship and finishing.

2. Sample will be returned to Contractor and may be
used in the work, if acceptable.

C. Shop Drawings: Furnish to show all assemblies with size,
details of joining, provisions for weep holes, and
specifics of material and fabrication.

1.04 QUALITY ASSURANCE

A. Specialist: Required for all custom sheet ornament
fabrication, assembly, and installation.

1. A master sheet metal artisan with demonstrated
capability of cutting and forming sheet work to
patterns.

2. Must have capability to fabricate stamped or formed
sheet ornament to match designs, be already in
production of such work, or able to do a custom
set-up for limited production for this job.

1.05 DELIVERY, STORAGE AND HANDLING

A. Box, crate, palletize and wrap materials with
weatherproof covering during shipment, handling and
storage.

B. Protect materials from exposure to elements and keep dry
at all times.

C. Painted or other factory finishes:

1. Protect against impact, abrasion, discoloration,
and other damage.

2. Replace damaged article, or refinish any damage to
original condition, before installation and
acceptance.


PART 2---PRODUCTS

2.01 MANUFACTURERS: do a web search of "ornamental copper sheetmetal" and/or:

A. The W. F. Norman Corp.
www.wfnorman.com


B. Schmeer Sheet Metal
www.seheersheetmetal.com



C. McBride Sheet Metal
Portland, OR


2.02 MATERIALS

A. General:

1. Furnish all materials and fabrication to fully
restore and rehabilitate the existing roof
ornamental facia assemblies, gutter, and related
flashings.

2. Match existing materials and original workmanship
as practicable.

B. Copper:

1. Standard Specification for Copper Sheet and Strip for Building Construction, ASTM
B370-12.

2. ASTM Standard Designations for Copper and Copper
Alloys , 110 Cold Rolled for sheet roofing and
flashing work and Soft Copper for ornamental
stamped work.

3. 16-ounce minimum weight or heavier to match
existing.

C. Solder and Flux: ASTM B32, composition 50% tin and 50%
lead.

1. Rosin, muriatic acid neutralized with zinc or
approved proprietary flux.

D. Nails and Fasteners:

1. Nails, screws, rivets, and bolts: all hard copper,
brass, or bronze.

2.03 FABRICATION

A. Stamp or Press Formed Ornamental Replacement Work: (see websites and/or The
W. F. Norman Corp., Schmeer Sheet Metal, Portland, and
McBride Sheet Metal, Portland), or approved equal.

1. Die stamped or pressed from soft copper sheet with
allowance for fitting and trimming to make larger
assemblies.

2. Allow margins for joining with other pieces by
mechanical fastenings or soldering.

3. No torn or broken pieces.

B. Pattern Cut, Stamp or Press Formed Assembled Ornamental
Work:

1. Cut pieces, die stamped or pressed from sheet metal
with allowance for fitting and trimming to make
larger assemblies.

2. Allow margins for joining with other pieces by
mechanical fastenings or soldering.

3. Miter, slot, and bend pieces to match curved and
angled work with smoothly formed curves.

4. No torn or broken pieces.

5. Dies for stamping or pressing such as approved;
metal dies are optional with fabricator.


PART 3 --- EXECUTION

3.01 EXAMINATION

A. Examine existing conditions, roof slopes, substrate and
anchorage conditions to assure that the fabricated
ornament and structure closely fit and will be properly
anchored to resist the imposed loads without movement or
damage to other work.

3.02 ERECTION, INSTALLATION, APPLICATION

A. Save and recondition all original fabric unless found to
be unserviceable. Consult with the RHPO to determine if
an original element is unserviceable. Flat sheet members
may be replaced in kind where this facilitates the
overall restoration and when original lines, dimensions,
and workmanship are maintained.

B. New Work to Replace and Repair Existing:

1. Make to match existing work.

2. Follow details in SMACNA Architectural Manual.

3. Do all work, tinning, soldering, metal forming,
etc., to highest standards as will produce
weatherproof, properly seamed, joined, and soldered
work, free from surface stains and wrinkled or
buckled finishes.

4. Reinforce seams and folds as required to prevent
binding or tearing.

5. Seal over all exposed fastenings in horizontal and
wash surfaces with matching metal caps or dutchmen
and solder.

6. Hem all flashing edges 1/2-inch.

7. Lock and solder all joints other than expansion
joints.

8. Neatly form joints and seams with surfaces free
from waves and buckles.

9. Make exterior work permanently water tight.

10. Provide for weep holes to permit water to drain
from bases without damaging the base or penetrating
the roof.

11. Connect gutter drops to existing rain drains.

C. Flashing: Make to restore original details and design,
and as approved by SMACNA for this condition. Provide
galvanic separation wherever copper metal is adjacent to
other metals.

3.03 ADJUSTING/CLEANING

A. Leave finished work clean, with all work stains removed
and flux residue neutralized and rinsed off.

B. Remove all excess solder splashes, excess tinned areas,
and runs from surfaces.

C. Finished work to be acceptable to painter for final
finishing.



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