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	SECTION 05716
	** NOTE TO SPECIFIER ** Duvinage, LLC; custom fabricated circular stairs. This section is based on the products of Duvinage, LLC, which can be reached at: 60 West Oak Ridge Drive Hagerstown, MD 21740 Tel: 800-541-2645 Fax: 301-791-7240 E-mail: bobm@keybridgepartners.com www.duvinage.com Duvinage is the oldest and most trusted manufacturer of custom spiral and circular stairs in the United States. Superior design, precise engineering, and careful construction have enabled Duvinage to supply staircases to the most prestigious addresses in America, including the White House and the National Gallery of Art. Services provided at no cost to Duvinage's valued customers include architectural and contractor advisory services, consulting services, cost estimates, and layout services. .
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	** NOTE TO SPECIFIER ** Delete items below not required for project.
		A.	Prefabricated custom-designed circular stair, including structural stringers, radial treads, and spiral handrails.
		B.	Miscellaneous installation hardware and accessories.
	1.2	RELATED SECTIONS
	** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
		A.	Section 05510 - Metal Stairs: Standard fire exit stairs.
		B.	Section 05715 - Fabricated Spiral Stairs.
		C.	Section 06100 - Rough Carpentry: Framed floor opening.
		D.	Section 07900 - Joint Sealers: Sealants applied between spiral stair and adjacent work.
		E.	Section 09260 - Gypsum Board Assemblies: Finished soffit of circular stair.
		F.	Section 09300 - Tile: Tread finish material.
		G.	Section 09680 - Carpet: Tread finish material.
		H.	Section 09900 - Paints and Coatings: Paint finish to match adjacent materials.
	1.3	REFERENCES
	** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
		A.	ASTM A 53/A 53M - Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless; 2000.
		B.	ASTM A 283/A 283M - Standard Specification for Low and Intermediate Tensile Strength Carbon Steel Plates; 2000.
		C.	ASTM A 500 - Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes; 2001a.
		D.	NAAMM AMP 510 - Metal Stairs Manual; The National Association of Architectural Metal Manufacturers; 1992, Fifth Edition.
	1.4	SUBMITTALS
		A.	Submit under provisions of Section 01300.
		B.	[ Product Data ]: Manufacturer's data sheets on stair components to be used, including:
			1.	Preparation instructions and recommendations.
			2.	Storage and handling requirements and recommendations.
			3.	Complete assembly and anchorage requirements.
		C.	Shop Drawings: Indicate detailed stair configuration, supporting accessories and connections, required floor opening and stair height tolerances, and other measurements affecting the stair.
	** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected.
		D.	Selection Samples: For each finish specified, two complete sets of color chips representing manufacturer's full range of available colors and patterns.
		E.	Verification Samples: For each finish specified, two samples, minimum size 6 inches (150 mm) square, representing actual color and finish.
	1.5	QUALITY ASSURANCE
		A.	Manufacturer Qualifications: A company specializing in the manufacture of circular stairs with not less than ten years of documented experience.
		B.	Field Measurements: Verify that field measurements are within tolerances acceptable to manufacturer.
	1.6	DELIVERY, STORAGE, AND HANDLING
		A.	Store stair in manufacturer's unopened packaging until ready for installation.
		B.	Handle stair as recommended by manufacturer to avoid damage to stair and adjacent finishes.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Acceptable Manufacturer: Duvinage, LLC, which is located at: 60 W. Oak Ridge Dr. ; Hagerstown, MD 21740; Toll Free Tel: 800-541-2645; Tel: 301-733-8255; Email: bobm@keybridgepartners.com; Web: www.duvinage.com
	** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
		B.	Substitutions: Not permitted.
		C.	Requests for substitutions will be considered in accordance with provisions of Section 01600.
	2.2	STAIR DESIGN
		A.	Conform to applicable building code for live and dead loads applicable to work of this section.
		B.	Design Loads: Comply with NAAMM AMP 510.
			1.	Uniform Live Load: 100 lb/sq ft (4.7 kPa).
			2.	Concentrated Live Load: Minimum 300 lb (1330 N).
			3.	Maximum Lateral Load to Handrail Without Permanent Set: 200 lbs (890 N).
	** NOTE TO SPECIFIER ** Delete options not required from the list below Stair Design.
		C.	Stair Design:
			1.	Inside stair diameter: _____ inches (_____ mm).
			2.	Outside stair diameter: _____ inches (_____ mm).
			3.	Tread Angle: ____ degrees.
			4.	Landing Platform: ___ degrees.
	** NOTE TO SPECIFIER ** Do not include this paragraph if no intermediate platform is required.
			5.	Intermediate Platform: ___ degrees.
			6.	Floor to Floor Height: ______ inches (____ mm).
	2.3	STAIR COMPONENTS
		A.	Stringers: Sections built up from ASTM A 283 steel plate.
		B.	Stringers: Cold-formed structural steel tubing per ASTM A 500, Grade B.
		C.	Treads and Platforms: ASTM A 283 steel plate, minimum 1/4 inch (6.35 mm).
		D.	Balusters: Standard 3/4 inch (19 mm) diameter round steel rod, formed and milled to fit the curvature of the spiral rail for a clean and neat appearance, and with countersunk holes for mechanical connection of spiral rail.
		E.	Spiral Rail: ASTM A 53/A 53M Schedule 40 cold formed steel pipe, nominal 1 inch (25 mm) diameter (1.313 inches O.D.), drilled and tapped for flat head cap screws.
	** NOTE TO SPECIFIER ** Paragraph below applies to Duvinage Design 160.
		F.	Spiral Rail: Birch railing, nominal 1-3/4 by 2 inches (44 by 51 mm) cross section, machined and sanded in preparation for field applied finishes in accordance with requirements of Section 09900.
	** NOTE TO SPECIFIER ** Paragraph below applies to Duvinage Design 170.
		G.	Spiral Rail: Birch railing, nominal 2 inch (50 mm) diameter, machined and sanded in preparation for field applied finishes in accordance with requirements of Section 09900.
	** NOTE TO SPECIFIER ** Paragraph below applies to Duvinage Design 180.
		H.	Spiral Rail: Birch railing, nominal 1-3/4 by 5 inch (44 by 127 mm) rectangular cross section, machined and sanded in preparation for field applied finishes in accordance with requirements of Section 09900.
	2.4	FABRICATION
		A.	Fit and shop assemble components in largest practical sections, for delivery to site.
		B.	Fabricate stair to suit adjacent construction with tolerances for installation, including application of joint sealers in joints between stair and adjoining work, in accordance with requirements of Section 07900.
		C.	Weld structural stair components together, except where bolted or screwed field connections are required. Site welding is not permitted.
		D.	Grind exposed joints flush and smooth with adjacent finish surface. Make exposed joints butt tight, flush, and hairline. Ease exposed edges to small uniform radius.
		E.	Form spiral rails to be continuous and to match spiral form of stair within manufacturer's minimum factory tolerance.
		F.	Pre-assemble stair at the factory. Inspect before finishing, packaging and shipping, to assure that construction adheres to specified requirements.
	2.5	FINISHES
		A.	General: Apply factory finishes to all steel surfaces, including mounting hardware and integral structural members, after stair has been assembled. Remove scratches and blemishes from surfaces that will be exposed after installation and refinish as necessary.
		B.	Surface Preparation: Preheat metal surfaces with a multi-stage cleaning, pretreatment, and chemical conversion coating, in strict accordance with coating manufacturer's recommendations.
		C.	Apply one coat of water-based rust inhibitive green primer to all steel parts, using applicators licensed by coating manufacturer.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	Verify that field measurements are acceptable to suit stair assembly tolerances.
		B.	Do not begin installation of stair until field conditions are acceptable. Do not field cut or otherwise modify stair components.
	3.2	INSTALLATION
		A.	Install stair assembly in accordance with manufacturer's instructions.
		B.	Install stair to be plumb, level, and true, properly aligned with adjacent work. Rigidly secure with clips, bolts, and anchors as required.
	** NOTE TO SPECIFIER ** Paragraph below is only one example of field-applied finishes on treads made of steel plate. Other finishes are also possible.
		C.	Tile installation is specified in Section 09300.
	** NOTE TO SPECIFIER ** Paragraph below is only one example of field-applied finishes on treads made of steel plate. Other finishes are also possible.
		D.	Carpet installation is specified in Section 09680.
		E.	Drywall soffit installation is specified in Section 09260.
		F.	Application of field coatings is specified in Section 09900.
	3.3	PROTECTION
		A.	Protect installed products until completion of project.
		B.	Touch-up, repair or replace damaged components before Substantial Completion.
	END OF SECTION