Restoration of Ornamental Copper Sheetmetal Fascia and Roof Flashing

CSI Division
Division 7 - Thermal and Moisture Protection
Section
Sheet Metal Flashing And Trim
Last Modified

Technical Procedures Disclaimer

Prior to inclusion in GSA’s library of procedures, documents are reviewed by one or more qualified preservation specialists for general consistency with the Secretary of Interior Standards for rehabilitating historic buildings as understood at the time the procedure is added to the library. All specifications require project-specific editing and professional judgement regarding the applicability of a procedure to a particular building, project or location. References to products and suppliers are to serve as a general guideline and do not constitute a federal endorsement or determination that a product or method is the best or most current alternative, remains available, or is compliant with current environmental regulations and safety standards. The library of procedures is intended to serve as a resource, not a substitute, for specification development by a qualified preservation professional.

Rewrite

We’ve reviewed these procedures for general consistency with federal standards for rehabilitating historic buildings and provide them only as a reference. Specifications should only be applied under the guidance of a qualified preservation professional who can assess the applicability of a procedure to a particular building, project or location. References to products and suppliers serve as general guidelines and do not constitute a federal endorsement nor a determination that a product or method is the best alternative or compliant with current environmental regulations and safety standards.

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)

B. American National Standards Institute, Inc. (ANSI)

C. American Welding Society (AWS) Soldering Handbook (most current version)

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

1.03 SUBMITTALS

A. Method for Stamped and 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.

B. Schmeer Sheet Metal

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

Print Page
Last updated: Jul 1, 2019
Top