05_70_00_DECORATIVE_METAL_r1.pdf

FLNI 200729B 05 70 00 - 1

DECORATIVE METAL

SECTION 05 70 00 - DECORATIVE METAL

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Stainless steel components to hang wind chime assembly from precast concrete structure tower.

2. Stainless steel components supporting wood bench backs.

3. Stainless steel fabrication work not specified in other Sections.

B. Related work:

1. Division 3 for stainless steel connectors to assemble precast concrete structure.

2. Division 6 for wood bench slats.

3. Division 11 for aluminum wind chimes.

1.2 REFERENCES

A. AISC Design, Fabrication and Erection of Structural Steel for Buildings.

B. AISI, Specifications for the Design of Cold-Formed Steel Structural Members.

C. AWS D1.6, Structural Welding Code - Stainless Steel.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of product, including finishing materials.

B. Shop Drawings:

1. Furnish setting drawings, templates and directions for installation of anchorages, including sleeves, concrete inserts, anchor bolts and items with integral anchors, that are to be embedded in concrete or masonry.

2. Provide details, sections and anchorage of stainless steel bench backs and protection screens.

C. Samples for Verification:

1. For each type of exposed finish.

2. Samples of welded joints showing quality of workmanship and color matching of materials.

1.4 INFORMATIONAL SUBMITTALS

A. Welder’s certificate.

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B. Mill Certificates: Signed by manufacturers of stainless-steel certifying that products furnished comply with requirements.

1.5 QUALITY ASSURANCE

A. Fabricator Qualifications: A firm experienced in producing decorative metal similar to that indicated for this Project and with a record of successful in-service performance, as well as sufficient production capacity to produce required units.

B. Installer Qualifications: Fabricator of products.

C. Welding Qualifications:

1. Qualify procedures and personnel according to the following:

a. AWS D1.6/D1.6M, "Structural Welding Code - Stainless Steel."

b. Welders welding stainless steel fabrications shall be qualified to weld stainless steel using TIG equipment.

c. Examine that welders to be employed in this work have satisfactorily passed AWS qualification tests.

d. If recertification of welders is required, retesting will be Contractor's responsibility.

D. Special inspections:

1. Except where otherwise specified, special inspections by Contractor’s testing laboratory, prescribed by Code, will not be required where work is performed on the premises of a licensed fabricator, registered and approved by authorities having jurisdiction to perform such work without special inspection.

2. Submit certificates of compliance to demonstrate compliance with the above requirement.

3. Costs for fabricator tests, inspections and quality control shall be borne by the Contractor.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Store decorative metal above ground, under cover, in a well-ventilated area, away from uncured concrete, protected from weather, moisture, soiling, abrasion, extreme temperatures, and humidity.

PART 2 - PRODUCTS

2.1 METALS, GENERAL

A. Metal Surfaces, General: Use materials with smooth, flat surfaces unless otherwise indicated.

Use materials without seam marks, roller marks, rolled trade names, stains, discolorations, or blemishes.

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2.2 STAINLESS STEEL

A. Sheet, Strip, Plate, and Flat Bar: ASTM A 666, Type 316L.

B. Bars and Shapes: ASTM A 276, Type 316L.

2.3 FASTENERS

A. Fasteners: Provide Type 316L stainless steel or zinc-coated fasteners. Select fasteners for the type, grade, and class required.

1. Bolts and nuts: Regular hexagon-head bolts, ASTM A 307, Grade A, Property Class 4.6;

with hex nuts, ASTM A 563; and flat washers, unless otherwise indicated.

a. Fasteners for wood benches: Type 316L stainless steel, vandal resistant fasteners.

2. Drilled-in expansion anchors:

a. Expansion anchors complying with FS FF-S-325, Group VIII (anchors, expansion, [non-drilling]), Type I (internally threaded tubular expansion anchor); and machine bolts complying with FS FF-B-575, Grade S, by Hilti, Inc., or ITW Ramset/Red

Head.

b. Select anchors with capability to sustain, without failure, a load equal to 6 times the load imposed when installed in masonry and equal to 4 times the load imposed when installed in concrete, as determined by testing per ASTM E 488.

3. Chemical anchors:

a. Set by Simpson Strong-Tie Co., Inc. or HY-150 by Hilti, both used with machine bolts complying with FS FF-B-575, Grade S.

b. Select drilled-in and chemical anchors to resist loads imposed thereon with a safety factor of 4 minimum for static loads, and 10 minimum for dynamic and overhead loads.

4. Concrete inserts:

a. Threaded or wedge type galvanized ferrous castings, either malleable iron complying with ASTM A 47, or cast steel complying with ASTM A 27.

B. Fasteners for Anchoring to Other Construction: Unless otherwise indicated, select fasteners of type, grade, and class required to produce connections suitable for anchoring indicated items to other types of construction indicated.

C. Provide concealed fasteners for interconnecting components and for attaching decorative metal items to other work unless exposed fasteners are unavoidable.

2.4 MISCELLANEOUS MATERIALS

A. Welding Rods and Bare Electrodes:

1. Select according to AWS specifications for metal alloy welded.

2. For stainless steel, use TIG using rods made from alloyed Type 308 stainless steel, as required for color match, strength and compatibility in the fabricated items.

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2.5 FABRICATION

A. Fabricate and assemble items in the shop to greatest extent possible to minimize field splicing and assembly. Disassemble units only as necessary for shipping and handling limitations.

Clearly mark units for reassembly and coordinated installation. Use connections that maintain structural value of joined pieces.

B. Form decorative metal to required shapes and sizes, true to line and level with true curves and accurate angles and surfaces. Finish exposed surfaces to smooth, sharp, well-defined lines and arris.

C. Cut, drill, and punch metals cleanly and accurately. Remove burrs and ease edges to a radius of approximately 1/32 inch unless otherwise indicated. Remove sharp or rough areas on exposed surfaces.

D. Mill joints to a tight, hairline fit. Cope or miter corner joints. Fabricate connections that will be exposed to weather in a manner to exclude water.

E. Provide weep holes where water may accumulate. Locate weep holes in inconspicuous locations.

F. Provide necessary rebates, lugs, and brackets to assemble units and to attach to other work. Cut, reinforce, drill, and tap as needed to receive finish hardware, screws, and similar items unless otherwise indicated.

G. Comply with AWS for recommended practices in shop welding. Weld behind finished surfaces without distorting or discoloring exposed side. Clean exposed welded joints of flux, and dress exposed and contact surfaces.

1. Where welding cannot be concealed behind finished surfaces, finish joints to comply with NOMMA's "Voluntary Joint Finish Standards" for Type 1 Welds without evidence of a welded joint.

2.6 WELDING

A. Weld shop and field connections continuously in compliance with AWS D1.6, Structural

Welding Code - Stainless Steel, unless bolted connections are specifically shown.

B. Grind welds that will remain exposed, smooth and flush to match and blend with parent metal surfaces. Match approved weld samples.

2.7 FABRICATION TOLERANCES

A. Squareness: 1/8 inch maximum difference in diagonal measurements.

B. Maximum offset between components at joints: 1/16 inch except that at welded joints no offset is allowed.

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C. Maximum misalignment of adjacent members: 1/16 inch.

D. Maximum bow: 1/8 inch in 48 inches.

E. Maximum deviation from plane: 1/16 inch in 48 inches.

2.8 FINISHES

A. Comply with NAAMM's "Metal Finishes Manual for Architectural and Metal Products" for recommendations for applying and designating finishes.

B. Protect mechanical finishes on exposed surfaces from damage by applying a strippable, temporary protective covering before shipping.

2.9 STAINLESS-STEEL FINISHES

A. Surface Preparation: Remove tool and die marks and stretch lines, or blend into finish.

B. Polished Finishes: Grind and polish surfaces to produce uniform finish, free of cross scratches.

1. Run grain of directional finishes with long dimension of each piece.

2. When polishing is completed, passivate and rinse surfaces. Remove embedded foreign matter and leave surfaces chemically clean.

C. Bright, Cold-Rolled, Unpolished Finish: No. 2B.

D. Directional Satin Finish: No. 4.

E. Abrasive Blast Finish: Pneumatically applied glass beads under high pressure to produce a light, smooth grainy textured surface on stainless steel Protective Screens. Passivate surface by allowing exposed surfaces to oxidize naturally or if required by the Contracting Officer, chemically treat using a 10 to 15 percent concentration by volume of nitric acid applied to surfaces. Rinse to completely remove nitric acid solution.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of decorative metal.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

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3.2 INSTALLATION

A. Provide anchorage devices and fasteners where needed to secure decorative metal to in-place construction.

B. Perform cutting, drilling, and fitting required to install decorative metal. Set products accurately in location, alignment, and elevation, measured from established lines and levels.

Provide temporary bracing or anchors in formwork for items to be built into concrete, masonry, or similar construction.

C. Fit exposed connections accurately together to form tight, hairline joints or, where indicated, uniform reveals and spaces for sealants and joint fillers. Where cutting, welding, and grinding are required for proper shop fitting and jointing of decorative metal, restore finishes to eliminate evidence of such corrective work.

D. Do not cut or abrade finishes that cannot be completely restored in the field. Return items with such finishes to the shop for required alterations, followed by complete refinishing, or provide new units as required.

E. Install concealed gaskets, joint fillers, insulation, and flashings as work progresses.

F. Restore protective coverings that have been damaged during shipment or installation. Remove protective coverings only when there is no possibility of damage from other work yet to be performed at same location.

1. Retain protective coverings intact; remove coverings simultaneously from similarly finished items to preclude non-uniform oxidation and discoloration.

G. Field Welding: Comply with applicable AWS specification for procedures of manual shielded metal arc welding and requirements for welding and for finishing welded connections in

"Fabrication, General" Article. Weld connections that are not to be left as exposed joints but cannot be shop welded because of shipping size limitations.

3.3 CLEANING AND PROTECTION

A. Unless otherwise indicated, clean metals by washing thoroughly with clean water and soap, rinsing with clean water, and drying with soft cloths.

B. Protect finishes of decorative metal from damage during construction period with temporary protective coverings approved by decorative metal fabricator. Remove protective covering at time of Substantial Completion.

C. Restore finishes damaged during installation and construction period so no evidence remains of correction work. Return items that cannot be refinished in the field to the shop; make required alterations and refinish entire unit, or provide new units.

END OF SECTION 05 70 00