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Historic Preservation - Technical Procedures

Spectitle:

Restoration Of Ornamental Copper Sheetmetal Fascia & Roof Flashing

Procedure code:

0762001R

Source:

Us Custom House, Portland, Or - Gsa/Facil Support Center

Division:

Thermal And Moisture Protection

Section:

Sheet Metal Flashing And Trim

Last Modified:

02/24/2012

Details:

Restoration Of Ornamental Copper Sheetmetal Fascia & Roof Flashing



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.  GENERALLY, THIS PROCEDURE SHOULD BE PERFORMED
         BY AN EXPERIENCED CONTRACTOR.

    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), 100
         Barr Drive, West Conshohocken, PA 19428, (610) 832-9585
         or FAX (610) 832-9555.

    B.   American National Standards Institute, Inc. (ANSI), 1430
         Broadway, New York, NY  10018.

    C.   American Welding Society (AWS), "Soldering Manual" (most
         current version).

    D.   Sheet Metal and Air Conditioning Contractors National
         Association, Inc. (SMACNA) 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

    A.   The W. F. Norman Corp.
         P.O. Box 323
         Nevada, MO  64772
         800/641-4038

    B.   Schmeer Sheet Metal
         2376 NW Thurman
         Portland, OR  97210
         503/222-4911

    C.   McBride Sheet Metal
         1709 SE Powell Blvd.
         Portland, OR  97202
         503/235-2813

    D.   QCM Co.
         930 S. Central Ave.
         Kent, WA  98032
         800/321-0170

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.   Sheet and Strip for Building Construction, ASTM
              B370-66.

         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: (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  QCM Epoxy
              Tooling Compound  (QCM Co.), or approved equal;
              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.

                            END OF SECTION