SECTION 07820

METAL FRAMED SKYLIGHTS

PART	GENERAL

SECTION INCLUDES

Metal framed skylight system, glazed.

[Integral [insulated] curb.]

[Counterflashings.]

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [______-____________]: Placement of sill plate anchor bolts.

RELATED SECTIONS

Section [______-____________]: Structural perimeter curb.

Section 05120 - Structural Steel: Structural support framing for system.

Section 05500 - Metal Fabrications: Fabricated steel [attachment devices.] [framed opening.]

Section 06114 - Wood Blocking and Curbing: Wood support curbs.

Section 07190 - Vapor and Air Barriers: System perimeter vapor and air seal.

Section 07270 - Firestopping.

Section [______-____________]: Roofing system [and base flashing at skylight curb].

Section 07620 - Sheet Metal Flashing and Trim: Skylight counterflashing.

Section 07900 - Joint Sealants.

[Section 08800 - Glazing.]

REFERENCES

AAMA 603.8 - Performance Requirements and Test Procedures for Pigmented Organic Coatings on Extruded Aluminum.

AAMA 605.2 - Specification for High Performance Organic Coatings on Architectural Extrusions and Panels.

AAMA 606.1 - Specifications and Inspection Methods for Integral Color Anodic Finishes for Architectural Aluminum.

AAMA 607.1 - Specifications and Inspection Methods for Clear Anodic Finishes for Architectural Aluminum.

AAMA 608.1 - Specification and Inspection Methods for Electrolytically Deposited Color Anodic Finishes for Architectural Aluminum.

ASTM A36 - Structural Steel.

ASTM A123 - Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products.

ASTM B209 - Aluminum and Aluminum-Alloy Sheet and Plate.

ASTM B221 - Aluminum and Aluminum-Alloy Extruded Bar, Rod, Wire, Shape, and Tube.

ASTM E283 - Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors.

ASTM E330 - Structural Performance of Exterior Windows, Curtain Walls, and Doors by Uniform Static Air Pressure Difference.

ASTM E331 - Test Method for Water Penetration of Exterior Windows, Curtain Walls, and Doors by Uniform Static Air Pressure Difference.

FS TT-C-494 - Coating Compound, Bituminous, Solvent Type, Acid Resistant.

SSPC (Steel Structure Painting Council) - Paint Specification No. 15.

SYSTEM DESCRIPTION

Frame: [____x____] inch ([____x____] mm) profile, [self supporting] [supplementary support]; [thermally broken with interior tubular section insulated from exterior pressure plate;] matching stops and pressure plate of size and strength to provide bite on glazing; drilled drainage holes, deflector plates, and internal flashings to accommodate internal weep; drainage system [, internal mullion baffles to minimize "stack effect" at internal glazing spaces].

PERFORMANCE REQUIREMENTS

Design and size components to withstand dead and live loads, pressure and suction of wind acting on glazing [as calculated in accordance with [________] code.] [to a design pressure of [____] lb/sq ft ([____] Kpa).] [as measured in accordance with ASTM E330.]

Limit mullion deflection to [flexure limit of glass] [[3/4] [____] inch ([19] [____] mm)] [1/200] [________]; with full recovery of glazing materials.

System to accommodate, without damage to system, components or deterioration of seals; movement within system; movement between system and perimeter framing components; dynamic loading and release of loads; deflection of structural support framing [, creep of concrete structural members].

Thermal Resistance of Skylight System (Excluding Vision Areas): R of [____] (RSI of [____]).

Thermal Resistance of Vision [Glass] [Plastic] Areas: R of [____] (RSI of [____]).

Limit air infiltration through assembly to [0.06] [____] cfm/min/sq ft ([0.0003] [____] cu m/s/sq m) for glazed area, measured at a reference differential pressure across assembly of [1.57] [____] psf ([75] [____] Pa) in accordance with ASTM E283.

Vapor Seal with Interior Atmospheric Pressure of 1 inch (25 mm) sp, 72 degrees F (22 degrees C), 40 Percent RH: No failure.

****** [OR] ******

Water Leakage: None, when measured in accordance with ASTM E331.

System to provide for expansion and contraction within system components caused by a cycling temperature range of [170] [____] degrees F ([95] [____] degrees C) over a [12] [____] hour period without causing detrimental affect to system components.

Drain water entering joints, condensation occurring in glazing channels, or route moisture occurring within system, to the exterior by a weep drainage system.

Maintain continuous air and vapor barrier throughout assembly, primarily in line with [inside] pane of [glass] [plastic] and heel bead of glazing compound. [Position thermal insulation on exterior surface of air and vapor barrier.]

Not Permitted: Vibration harmonics, wind whistles, noises caused by thermal movement, thermal movement transmitted to other building elements, loosening, weakening, or fracturing of attachments or components of system.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate framed opening requirements and tolerances, pane opening sizes, anticipated deflection under load, affected related work, expansion and contraction joint locations and details, and field welding.

Product Data: Provide system and component dimensions, components within assembly, anchorage and fasteners, drainage details and flow diagrams.

Test Reports: Submit substantiating engineering data, test results of previous testing meeting performance criteria, and other supportive data.

Samples: Submit [two] [_______] samples, [____x____] inch ([____x____] mm) in size illustrating prefinished aluminum surface and specified [glass] [plastic] including glazed edge and corner.

Manufacturer's Installation Instructions: Indicate special procedures, perimeter conditions requiring special attention, and [________].

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum [three] [_______] years [documented] experience.

Installer: Company specializing in performing the work of this section [with minimum [__________] years [documented] experience] [approved by manufacturer].

Design framed skylight system under direct supervision of a Professional Structural Engineer experienced in design of this Work and licensed [at the place where the Project is located] [in the State of [____________]].

MOCKUP

Provide mockup of skylight system under provisions of Section [01400.] [________.]

Construct [________] mockup, [____] feet ([____] m) long by [____] feet ([____] m) wide, which includes frame, glazing, flashings, sealants, and [________].

Locate [where directed.] [________.]

Mockup may [not] remain as part of the Work.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

Provide [wrapping] [strippable material] to protect prefinished aluminum surfaces. Do not use adhesive papers or spray coatings which bond when exposed to sunlight or weather.

FIELD MEASUREMENTS

Verify that field measurements are as [indicated [on shop drawings].] [instructed by the manufacturer.]

COORDINATION

Coordinate work under provisions of Section [01039.] [________.]

Coordinate the work with the installation of [wood curbs] [and] [roofing system].

Coordinate this section with dimensions, tolerances, and method of attachment with other adjacent work.

[Coordinate the work with the continuity of air [and vapor] barrier work of Section [07190] [________].]

WARRANTY

Provide [five] [____] year warranty under provisions of Section [01700.] [________.]

Warranty: Include coverage for [insulating glass units from seal failure] [and] [installed assembly from moisture penetration].

PART	PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.] [________.]

MATERIALS

Extruded Aluminum: [ASTM B221,] [________] alloy, [____] temper.

Sheet Aluminum: [ASTM B209,] [________] alloy, [____] temper.

Internal Reinforcement: Steel sections, [ASTM A36,] [shapes to suit mullion sections.] [________.]

ACCESSORIES

Shop and Touch-Up Primer for Steel Components: [SSPC 15, Type 1, red oxide] [________].

****** [OR] ******

Touch-Up Primer for Galvanized Steel Surfaces: Zinc rich type.

Protective Back Coating: [FS TT-C-494, bituminous.] [________.]

Fasteners: [Stainless] [Galvanized] steel.

Insulation: [Glass fiber, stuffing type.] [As specified in Section [07213] [________].]

Flashings: [____] inch ([____] mm) thick [aluminum] [galvanized steel] [________], same finish as system components; secured with [concealed] [________] fastening method.

****** [OR] ******

Flashings: [____] inch ([____] mm) thick, same metal type and finish as [roof flashing metal.] [skylight frame.] secured with [concealed] [________] fastening method.

Anchorage Devices: Type recommended by manufacturer, [exposed to view.] [concealed.]

GLASS AND GLAZING MATERIALS

Glass: [________] type, as specified in Section [08800.] [________.]

****** [OR] ******

Glass: Single pane of [clear] [wired] [tempered] [laminated] [obscure] [tinted] [________] glass.

****** [OR] ******

Glass: Outer pane of [clear] [wired] [tempered] [laminated] [obscure] [tinted] [________] glass; inner pane of [clear] [tempered] [laminated] [wired] [________] glass [, each pane glazed separately].

****** [OR] ******

Glass: Sealed insulated units, outer pane of [clear] [wired] [tempered] [laminated] [obscure] [tinted] [________] glass; inner pane of [clear] [tempered] [laminated] [wired] [________] glass, space of sealed [air] [argon gas], [metal edge] [glass edge] frame.

Plastic: [________] type, as specified in Section [08800.] [________.]

****** [OR] ******

Plastic: Outer pane of [acrylic ] [polycarbonate], [clear] [translucent] [________] plastic; inner pane of [acrylic] [________], [clear] [________] plastic, each pane glazed separately.

Glazing Accessories: As specified in Section [08800.] [________.]

****** [OR] ******

Glazing Accessories: [Preformed glazing tape,] [extruded glazing devices,] [and] [________] type.

SEALANT MATERIALS

Sealant and Backing Materials: As specified in Section [07900] [________] of types described below.

Perimeter Sealant: [Polyurethane] [Silicone] [________] type.

Sealant Used Within System (Not Used for Glazing): [Polyurethane] [Silicone] [________] type.

FABRICATION

Rigidly fit and secure joints and corners with [screw and spline.] [internal reinforcement.] Make joints and connections flush, hairline, and weatherproof.

Fabricate components allowing for expansion and contraction with minimum clearance and shim spacing around perimeter of assembly, yet enabling installation.

Maintain continuous air and vapor barrier throughout assembly, with the barrier plane aligned with inside pane of glazing continuing to a heel bead of glazing sealant.

Drain water entering exterior joints, condensation occurring in glazing channels, or migrating moisture occurring within system, to exterior.

Prepare components to receive anchor devices. Fabricate anchorage items.

Arrange fasteners, attachments, and jointing to ensure concealment from view.

FINISHES

Finish coatings to conform to [AAMA 603.8] [AAMA 605.2] [AAMA 606.1] [AAMA 607.1] [AAMA 608.1].

Exterior Exposed Aluminum Surfaces: AAMA [A41] [A42] [A43] [A44] anodized to [215-R1] [____] thickness, prepared with a [mechanical M[____]] [chemical C[____]] pre-treatment, anodized to [clear] [________] color.

****** [OR] ******

Exterior Exposed Aluminum Surfaces: [[Exterior] [Hardcoat] [Two step] anodized to [clear] [________] color, to [0.0007] [____] inch ([0.018] [____] mm) thickness] [Organic coating to [________] color [as selected]].

Interior Exposed Aluminum Surfaces: AAMA [A41] [A42] [A43] [A44] anodized to [215-R1] [____] thickness, prepared with a [mechanical M[____]] [chemical C[____]] pre-treatment, anodized to [clear] [________] color.

****** [OR] ******

Interior Exposed Aluminum Surfaces: [[Interior] [Hardcoat] [Two step] anodized to [clear] [________] color, to [0.0007] [____] inch ([0.018] [____] mm) thickness] [Organic coating to [________] color [as selected]].

Concealed Steel Items: [Galvanized in accordance with ASTM A123 to [2.0] [____] oz/sq ft ([610] [____] g/sq m)]. [Primed with red oxide paint].

Apply [1] [____] [coat] [coats] of bituminous coating to concealed aluminum [and steel] surfaces in contact with dissimilar materials.

PART	EXECUTION

EXAMINATION

Verify that openings and adjoining air and vapor materials are ready to receive work of this Section.

INSTALLATION

Install system in accordance with manufacturer's instructions.

Method of attachment to structure to permit sufficient adjustment to accommodate construction tolerances and irregularities.

Align assembly free of warp or twist. Maintain assembly dimensional tolerances, aligning with adjacent work.

Attach and seal to adjacent air and vapor barrier materials.

Install [sill] [________] flashings.

Pack fibrous insulation in shim spaces at perimeter of assembly to ensure continuity of thermal barrier.

Install [glass] [plastic] in accordance with Section [08800] [________], using exterior [combination] [________] method of glazing.

Install sealant backing materials, Type [____] perimeter sealant, and install in accordance with Section [07900.] [________.]

Provide alignment attachments, shims, and anchors required to permanently fasten skylight system to building structure.

TOLERANCES

Maximum Variation from Plane: [1/8] [____] inch every 3 ft ([3] [____] mm/m) maximum or [1/4] [____] inch per 100 ft ([6] [____] mm/30 m), whichever is less.

Alignment of Two Adjoining Members Abutting in Plane: Within [0.015] [____] inches ([0.4] [____] mm).

CLEANING

Remove protective material from prefinished aluminum surfaces.

Wash down exposed surfaces; wipe surfaces clean.

Remove excess sealant.

END OF SECTION