Attachment 3 - Building Specification.PDF

NEW LONDON EMBASSY, UK

UNITED STATES DEPARTMENT OF STATE

OVERSEAS BUILDINGS OPERATIONS

GLASS CANOPIES 107316 - 1

Unclassified

SECTION 107316 GLASS CANOPIES

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the point supported Chancery glass canopies and the patch fitting supported CAC entrance canopies. The glass canopy work includes the following:

1. Glass and metal canopies, with pitches as shown, utilizing laminated glass supported by AISI 316 stainless steel, and architecturally exposed carbon steel framing and shapes.

2. Stainless steel cladding, shapes, gutters, flashings and similar items in conjunction with the canopies.

3. Internal carbon steel and stainless steel reinforcements.

4. Internal and perimeter sealing, joint fillers, and gasketing systems.

5. Anchors, embedments, shims, fasteners, inserts, expansion devices, accessories, support brackets, attachments, and grout.

6. Glass and glazing for the glass canopies.

B. Refer to Division 01 Sections for requirements regarding:

1. Sustainability credit achievement goals as summarized by the LEED Scorecard attached

2. Requirements for documentation of LEED and BREEAM credits.

3. Payment application requirements as they relate to LEED and BREEAM documentation requirements.

1.2 PERFORMANCE REQUIREMENTS

A. General: Provide canopies meeting or exceeding the following performance requirements and which are watertight, and capable of withstanding thermal movement, wind, snow and concentrated loads without failure of any kind, including loss or breakage of glass, failure of seal or gaskets, exudation of glazing sealants, and excessive deterioration of glazing materials.

All work of this section shall comply with the minimum requirements of the 2009 International Building Code (IBC), associated 2012 OBO International Code Supplement, and all amendments of the codes. In case of conflict between the referenced codes and the drawings and specifications, the document containing the most stringent requirements shall govern.

1. Structural Properties:

a. Wind Loads: The canopy assemblies, including glass, shall be designed, fabricated and installed to withstand the maximum inward and outward (upward/downward) wind pressures as per the .

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b. Dead Loads: Glass panel dead loads plus deadloads of all fittngs.

c. Snow Loads: As required by ASCE 7-05 for the geographical location of the building but not less than 1.44 kN/m2. Drift loads shall be considered where applicable, calculated per ASCE 7-05.

d. Live Load Criteria for Glass Maintenance Personnel: 1.33 kN concentrated load applied over a 0.76 m by 0.76 m area applied to any framing member or glass lite at a location that will produce the most severe stress or deflection.

e. Deflection Limitations:

1) Deflections: Base calculations for the following deflections upon the load combinations of ASCE 7-05, to include dead loads and maximum live, wind, and snow loads, frame deflections, thermal stresses, and erection tolerances.

a) Deflection of any steel framing member in a direction normal to the plane of the canopy glass shall not exceed 1/360 of the clear span between structural supports or 12.7 mm, whichever is less. For cantilevered steel framing members, deflection shall not exceed 1/180 of the span beyond the structural support or 12.7 mm, whichever is less.

b) Deflection of canopy glass at the center of the lite shall not exceed L/10t (where L is the long span of the lite between point supports or patch fittings, in millimeters, and t is the thickness, in millimeters, of the glass lite), or 12.7 mm, whichever is less. For cantilevered ends of canopy glass, deflection at the cantilevered end shall not exceed 2L/10t or 12.7 mm, whichever is less.

c) Deflection of canopy glass at an unsupported edge shall be limited to 1/175 of the clear span between supports or 12.7 mm, whichever is less.

d) Notwithstanding the criteria above, deflection of glass and framing shall be limited to avoid ponding such that, under maximum combinations of load, a minimum 2% slope for drainage is maintained.

e) Glass, sealants and finishes shall not be included to contribute to framing member strength, stiffness or lateral stability.

B. Thermal Movements: Fabricate the canopy work to accommodate for such expansion and contraction of component materials, and supporting elements, as will be caused by surface temperatures ranging from -10 C to +82 deg C, without causing buckling, glass breakage, failure of joint sealants, failure or deterioration of laminates, undue stress on metal members and fasteners, failure of operating units to function properly, reduction of performance, and other detrimental effects.

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1. Dimensions shown on Drawings are based on an assumed design temperature of +21 deg C. Fabrication and erection procedures shall take into account the ambient temperature range at the time of the respective operations.

C. Building Frame Movement: Design, fabricate and install the canopies to withstand structural frame movements including thermal movements, loading deflections, shrinkage, creep and similar movements without glass breakage, anchor failures, or structural damage. Thermal movements shall be based on criteria specified above. Structural frame deflections, shrinkage, creep and other movements are available from the structural engineer.

D. Water Penetration for Glass Canopies: Design, fabricate and install each glass canopy assembly including joints between glass units and gutter to effectively prevent the leakage of water under the canopies and into the adjacent vertical building exterior enclosure.

E. Glass Statistical Factor: Glass thicknesses when shown on the drawings, or specified, are for convenience of detailing only and are to be confirmed by the Contractor and/or glass manufacturer. In no case shall glass thickness be less than that shown on the Drawings, or the minimum thickness specified herein. For overhead canopy glass, allowable stresses under maximum load shall be based on a probability of breakage of 1/1000 or a safety factor of 4.0.

In the event that probabilities of breakage and safety factors specified herein yield conflicting results, the most stringent requirement shall be used.The glass manufacturer shall provide, on request, substantiating glass breakage data if such data is not otherwise available as manufacturer's published data.

F. Glass Canopy Assemblies: In addition to the foregoing performance requirements comply with the following:

1. Design the glass to be gravity supported using anchors in the quantities and symmetry indicated. The anchors shall be so designed, fabricated, spaced, and installed to ensure that the loads and stresses contributed from wind, and deadweight, are properly distributed to each anchor to comply with the performance requirements.

2. The glass assemblies shall be manufactured and assembled to allow for field adjustment between the theoretical shop drawing locations, and the actual field locations, of the glass anchor connection points to the structural framing.

3. The glass anchors shall be designed with tamperproof screw threaded assemblies which resist theft while enabling the length of the anchor components to be field adjustable.

These assemblies shall be locked using locknuts or pins once final adjustments have been made to avoid their being backed off while in service.

G. Design Modifications:

1. Submit design modifications necessary to meet the performance requirements and field coordination.

2. Variations in details or materials shall not adversely affect the appearance, durability or strength of components, nor shall such variations cause excessive stress, or deflections, to the building structural frame.

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3. Maintain the general design concept without altering size of members, profiles and alignment.

1.3 SUBMITTALS

A. Product Data: Submit manufacturer's specifications and installation instructions for each glass canopy component.

B. Submittals for LEED:

1. Credit MR 4.xx and Credit ID for Recycled Content:

a. Weight Component Documentation: For material assemblies or products having recycled content submit documentation indicating the weight of the material assembly or product and the percentages by weight of post-consumer and pre-consumer recycled content of the material assembly or product. The recycled fraction of the material assembly or product will be multiplied by the total cost of the material assembly or product to determine the recycled content value as prescribed by LEED protocol. Document the weight of the material assembly or product and the post-consumer and pre-consumer recycled contents on the letterhead of the supplier of the material assembly or product.

b. Cost Component Documentation: Provide the material cost for every component that comprises a material assembly or product that is composed of recycled content provided under this Section. Document the material cost on the letterhead of the supplier for each material assembly or product.

2. Credit MR 5.xx and Credit ID for Local/Regional Materials: Provide the location of manufacture and/or final assembly for each locally/regionally extracted, processed, and manufactured material incorporated into the Work. Locally/regionally extracted or processed is defined as materials having their source as a raw material from within a 800 km radius of the site. Locally/regionally manufactured is defined as materials having been assembled as a finished product within a 800 km radius of the project site.

Assembly does not include on-site assembly, erection or installation of finished components, as in structural steel, miscellaneous iron or systems furniture. For building materials or products shipped in part by rail or water, the total distance to the project shall be determined by weighted average, whereby the portion of the distance transported by rail is divided by 3, the portion of the distance transported by inland waterways is divided by 2, the portion of the distance transported by sea is divided by 15, and added to the portion of the distance transported by any other means other than by rail, inland waterways, sea, or road, provided the total weighted average distance does not exceed 800 kilometers.

a. Location Documentation: Include distance from the location of manufacture and/or final assembly to the project site for each locally/regionally extracted, processed, and manufactured material incorporated into the work. If only a fraction of the material is extracted and manufactured locally, indicate the percentage by weight. Submit this documentation on the letterhead of the supplier

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for each locally/regionally extracted, processed, and manufactured material incorporated into the Work.

b. Cost Documentation: Include a printed statement of cost for each regionally extracted, processed, and manufactured material. Submit this documentation on the letterhead of the supplier for each locally/regionally extracted, processed, and manufactured material incorporated into the Work.

C. Shop Drawings: Submit shop drawings showing scaled elevations, plans, and sections of the glass canopy work. Shop drawings shall be prepared, signed and sealed by a Professional or Chartered Engineer who is legally qualified or registered to practice engineering in the United States of America or the United Kingdom. Full scale sections shall be prepared and submitted for details of the assemblies that cannot be shown in the elevations or sections. Include with shop drawings metal thickness of all metal components, glass thicknesses, metal finishes, location of permanent safety glass markings on each glass type, and all other pertinent information as necessary or requested by the Project Director/COR to indicate compliance with the Contract Documents. Details of field connections, anchorage, and their relationship to the work of others shall be clearly indicated for the coordination of the work by other building trades. Details of fastening and sealing methods and product joinery shall be shown to ensure proper performance of the field installation. No work shall be fabricated until shop drawings for that work have been approved by Project Director/COR for fabrication.

D. Samples: Submit samples of the following before any work is fabricated:

1. 3 paired sets of samples for each exposed metal finish required. Sample finishes shall be on the specified alloy, temper, and thickness of metal required for the work. Furnish samples in 300-mm squares of sheet.

2. Glass: 300mm x 600mm Samples for each type of canopy glass. Glass samples shall show exposed-edge finish.

3. Chancery Rain Diverter: 300mm x 600mm Chancery glass sample with stainless steel rain diverter attached to one edge.

4. Glass Anchor (Fitting) Samples: Submit full sized glass anchor samples with each finish required. Sample finishes shall be on the specified alloy, temper, and thickness of metal required for the work. Sample review by the Project Director/COR will be for color, texture and reflectivity.

E. Structural Calculations: Submit, structural calculations concurrently with the corresponding shop drawings, indicating complete compliance with the specified performance requirements for approval by the Project Director/COR. Calculations shall be prepared, signed and sealed by a Professional or Chartered Engineer who is legally qualified or registered to practice engineering in the United States of America or the United Kingdom. Clearly indicate loads that will be transferred to adjacent supporting cladding and framing elements.

1. Finite Element Analysis: Submit a finite element analysis of the glass assemblies demonstrating that the glass will not exceed the specified deflection and allowable stress limitations.

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F. Glass Treatment Certificates: Submit glass treatment certificates signed by manufacturer of the heat soaked glass products certifying that products furnished comply with requirements.

G. Maintenance Manual: At the completion of the Project, submit five (5) bound copies of a maintenance manual describing the various materials, equipment, and procedures for cleaning and maintaining the Work of this Section. I the glass canopies.

1.4 QUALITY ASSURANCE

A. Fabricator Qualifications: Award the fabrication of the canopy components to a single firm specializing in the fabrication of canopy component assemblies who has successfully produced work similar in design and extent to that required for the project, in not less than three projects of similar scope to the satisfaction of the Project Director/COR, and whose work has resulted in construction with a record of successful in-service performance for a period of 5 years. The fabricator shall have sufficient production capacity, have organized quality control and testing procedures, to produce and properly install the canopies required without causing delay in progress of the Work. Fabricators known to be capable of manufacturing canopies of the types indicate include the following:

1. Pilkington Glass.

2. Eckelt Glas a subsidiary of Saint Gobain Glass.

3. Seele.

4. Josef Gartner Div. of Permasteelisa.

B. Installer Qualifications: Subcontract the canopy work to a firm which is specialized in the erection of custom canopies and who has successfully installed work similar in design and extent to that required for the project, in not less than three projects of similar scope to the satisfaction of the Project Director/COR, and whose work has resulted in construction with a record of successful in service performance for a period of 10 years.

C. Standards: Comply with the applicable provisions and recommendations of the following standards below, where standards conflict the more stringent shall apply:

1. American Institute of Steel Construction (AISC), "Steel Construction Manual," Current Edition.

2.

3. Steel Structures Painting Council (SSPC): "Steel Structures Painting Manual, Vol. 2, Systems and Specifications".

4. Federal Standard 16 CFR 1201, Consumer Product Safety Commission (CPSC): "Safety Standard for Architectural Glazing Materials," as published in the Code of Federal Regulations (CFR). Comply with the applicable requirements of the laws, codes, ordinances and regulations of Federal and Municipal authorities having jurisdiction, wherever requirements conflict the more stringent shall be required. Obtain approvals

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from all such authorities. As a minimum provide safety glazing complying with ANSI Z97.1 and testing requirements of 16 CFR Part 1201 for Category II materials.

a. Subject to compliance with requirements, permanently mark safety glass with certification label of Safety Glazing Certification Council or another certification agency acceptable to authorities having jurisdiction. Locate permanent markings in one corner, and in the same location, of each glass lite in accordance with the requirements of the SGCC labeling guidelines. Markings shall have a nominal size of no greater than 25 mm in diameter, and be located with glass edge clearances, at the corner, by not more than 20 mm up and 20 mm over.

5. Welding Standards: Welding shall be performed by skilled and qualified mechanics.

Welding shall be performed in accordance with the applicable provisions of AWS D1.1

6. Glass Association of North America (GANA):

a. "Glazing Manual."

b. "Laminated Glass Design Guide."

D. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 1 Section "Project Management and Coordination." Prior to the start of the canopy work, and at the Contractor's direction, meet at the site and review the construction schedule, availability of materials, installers personnel qualifications, equipment and facilities needed to make progress and avoid delays, installation procedures, inspecting procedures, and coordination with other work. Meeting shall include Contractor, Project Director/COR, canopy installer, as well as any other subcontractors or material technical service representatives whose work, or products, must be coordinated with the canopy work.

1.5 IDENTIFICATION, DELIVERY, STORAGE, AND HANDLING

A. All components of the canopy work shall be identified after fabrication by marks clearly indicating their location in the canopy assembly. Packaging of components shall be so selected to protect the components from damage during shipping and handling.

B. Storage on Site:

1. Store the canopy components in a location and in a manner to avoid damage to the components. Stacking shall be done in a way which will prevent bending, excessive pressure, abrasion or other permanent damage of the component and its finished surfaces.

2. Store the canopy components and materials in a clean, dry location, away from uncured concrete, and other construction activities. Cover with non-staining waterproof paper, tarpaulin, or polyethylene sheeting in a manner that will permit circulation of air inside the covering.

C. Keep handling on site to a minimum. Exercise particular care to avoid damage to finishes of metals.

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1.6 PROJECT CONDITIONS

A. Field Measurements: Verify dimensions of supporting structure by field measurements before fabrication so that the canopy work will be accurately designed, fabricated and fitted to the structure. Indicate measurements on Shop Drawings. Coordinate fabrication schedule with basis for measurements.

1. Established Dimensions: Where field measurements cannot be made without delaying the Work, establish dimensions and proceed with fabricating the canopy work without field measurements. Coordinate supporting structure construction to ensure actual dimensions correspond to established dimensions.

1.7 WARRANTY

A. Installers Workmanship Warranty: Submit a 5 year written warranty, beginning from date of substantial completion, and executed by the Contractor, manufacturer and the canopy installer agreeing to repair or replace components of the canopy that develop defects in workmanship within the specified warranty period. Defects include, structural failures, sealant failures, deterioration of metals, metal finishes, and other materials beyond normal weathering, uncontrolled water leakage, and any other evidence of failure or deterioration of the canopy work to meet performance requirements.

B. Warranty, Laminated Glass: Submit a 5 year warranty against deterioration of laminated glass.

Deterioration of laminated glass is defined as the development of manufacturing defects including discoloration, edge separation or delamination which materially obstructs vision through glass or otherwise compromises the requirements of the glass. Upon notification of such defect, within the warranty period, make the necessary replacements at the convenience of the Government.

C. Warranty, Ceramic Fritted Glass: Submit a 5 year warranty against any defects which may affect the appearance of the glass or may otherwise compromise the requirements of the glass.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Architecturally Exposed Stainless Steel Members: Refer to the structural drawings for structural stainless steel tubes, shapes, plates, nuts, bolts, washers and electrodes and the following for use in the fabrication of exposed stainless steel members that will be supporting the canopies:

1. Metal Surfaces: For stainless steel members exposed to view upon completion of the Work, provide materials selected for their surface flatness, smoothness, and freedom from surface blemishes and which comply with the AISC Manual for architecturally exposed structural steel (AESS). Do not use materials whose exposed surfaces exhibit pitting, seam marks, roller marks, rolled trade names, and roughness.

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B. Stainless Steel Members: Provide stainless steel members of the temper recommended by the manufacturer to satisfy system performance requirements and application of finish indicated.

Comply with requirements of ASTM A 666 Type 316L for sheet or plate, ASTM A 276 Type 316L for bar stock and shapes, ASTM A269 Type 316L or A554 Type 316L for tubing, ASTM A 296 Type 316L for castings. Glass anchors (fittings) shall be designed to receive glazing strips.

1. Surface Texture and Color: Use only materials which are smooth and free of surface blemishes, including, but not limited to, pitting, seam marks, roller marks, rolled trade names and roughness. Do not use materials which have stains and discolorations which do not match the Project Director/COR's sample in color and grain characteristics.

2. Surface Flatness and Edges: Provide materials which have been cold-rolled, cold-finished, cold-drawn, stretcher leveled, machine cut and otherwise produced to the highest commercial standard for flatness with edges and corners sharp and true to angle, as required.

3. Tempers: Fabricate from standard commercial tempers and hardnesses, as required for forming, fabrication, strength and durability and which will finish to match the Project Director/COR's sample.

4. Glass Anchors (Fittings): Fabricate bolted fittings to provide a flush appearance of the fitting to the weathering (sloping) surfaces of the glass canopies, unless otherwise indicated. Include provisions in the fitting design to prevent high stress concentrations at glass holes caused by wind loads, thermal movements, construction tolerances, and live and deadload movements. Fabricate fittings from Type 316 austenitic stainless steel castings and plates to shapes as required to suit system performance requirements.

C. Fasteners, Anchors and Accessories: Manufacturer's recommended noncorrosive fasteners, anchors and accessories that are compatible with materials used in the framing system.

Exposed portions of fasteners, anchors and accessories shall match the color of the fixing.

Where movement is expected, provide slip-joint linings of sheets, pads, shims, or washers of fluorocarbon resin, nylatron polyamide, or a similar material recommended by the manufacturer. Space fasteners and anchors as recommended by the glass manufacturer to suit system performance requirements.

1. Glass Anchor Connections: Stainless steel bolts, as required by the type of connection.

Grade, class, as selected by manufacturer to suit system performance requirements, with corrosion resistance equal to or greater than Type 316.

D. Gutter Flashing and Outlet Tubes: Fabricate from 2D finished, stainless-steel sheet complying with ASTM A 666, Type 316. Gutter flashing to be fabricated from thicknesses recommended by the glass canopy fabricator and approved during submittal review but no less than 26 gauge thick sheet, outlet tubes formed from 28 gauge thick sheet.

2.2 SEALING, GLASS AND GLAZING MATERIALS

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A. Concealed Sealing Materials: All sealing materials concealed within the canopies shall be silicone, compatible with and adherent to each material it will be in contact with, as recommended by the manufacturer to fulfill performance requirements.

B. Exposed Sealing Materials: All sealing materials exposed at the glass canopy perimeter joints in contact with adjacent cladding materials shall be silicone, compatible with and adherent to each material it will be in contact with, as recommended by the manufacturer to fulfill performance requirements.

C. Glass and Glazing Materials:

1. General: Provide products of material, size, and shape complying with referenced glazing standard, requirements of manufacturers of glass and other glazing materials involved for glazing application indicated, and with a proven record of compatibility with surfaces, and wet glazing materials, contacted in installation.

a. Source Limitations for Glass and Glass Fabrication: All glass furnished for the project shall have been float manufactured and fabricated in either North American or European facilities.

2. Cleaners, Primers and Sealers: Type recommended by sealant or gasket manufacturer.

3. Glazing and Gasketing Strips: Continuous, silicone with cross sectional profile, physical properties, and cross sectional fabrication tolerances, and surface condition, as recommended by the canopy manufacturer, and as required, to comply with the system performance requirements specified and shown.

4. Glass: Level of heat treatment of glass used in the fabrication of the canopy glass units shall be as recommended by the canopy manufacturer to comply with system performance requirements specified.

a. Glass Quality: Glass shall meet requirements of ASTM C1036 for the applicable quality hereinafter specified for each type of glass.

b. Float Glass:

1) Ultraclear (low iron) Float Glass: Complying with ASTM C1036, Type I, Quality-Q3, Class I, and with visible light transmission not less than 91 percent.

2) Exposed and Butt Edges: Flat edge (cut edge of glass is flat and surface edges are slightly arrised) with polished finish.

c. Full Tempered (Toughened) Glass: Glass complying with ASTM C1048 Kind FT, horizontally tempered. In order to meet the flatness tolerances specified glass treated in vertical ovens will not be permitted. Surface compression shall be 55 MPa minimum and shall be as required by the glass canopy manufacturer.

d. Flatness Tolerances: All heat treated glass shall be fabricated to the following flatness tolerances:

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1) Roll Ripple: The deviation from flatness at any peak (peak to valley deviation) shall not exceed an average of 0.05 mm, with a maximum sag at the leading and trailing edge of 0.25 mm.

2) Fabrication Process: By horizontal (roller-hearth) process with roll-wave distortion perpendicular to bottom edge of installed glass unit.

e. Heat Soaking: All glass is required to be tempered shall be heat soaked in accordance with the glass canopy manufacturers recommendations (EN 14179-1 and DIN 18516). Statistical heat soaking shall not be permitted. The purpose of the heat soaking is to convert nickel sulfide inclusions, if present, from the alpha phase to the beta phase to cause the glass to fracture during the test.

1) Prestress glass around holes to a level which is compatible with the design and use of the fittings. Check stress levels by the use of a differential surface refractometer.

5. Laminated Glass:

a. Structural Interlayer: Clear ionoplast of thickness indicated with a proven record of no tendency to bubble, discolor, or lose physical and mechanical properties after laminating glass lites and installation.

1) Product Reference: Dupont; SGP (SentryGlas Structural Interlayer).

b. Laminating Process: Fabricate laminated glass to produce glass free of foreign substances and air or glass pockets using manufacturers standard laminating process.

c. Compatibility: Interlayer shall be compatible with all glazing sealants.

d. Interlayer shall limit UV radiation to 60 microwatts/lumen.

e. Laminated Safety Glass Units: Two lites of glass, bonded together with not less than 2.29 mm thick clear, puncture resistant, ionoplast interlayer, made specifically for laminating glass. Provide glass complying with the requirements of 16 CFR 1201 Category II, ANSI Z97.1, and ASTM C 1172.

1) Prior to laminating, cut glass to required sizes and profiles as determined by accurate measurement of openings to be glazed, making allowance for required edge clearances. Cut and process edges in accordance with glass manufacturer's recommendations. Do not cut or treat edges in the field.

6. Ceramic Frit Coated Glass:

a. All ceramic frit coated glass shall be heat-strengthened or fully-tempered and meet the requirements specified herein, but in no case less than the minimum requirements of ASTM C 1048.

b. Visual Quality Control acceptance criteria of the ceramic fritted surface shall be consistent with industry guidelines, subject to approval by the COR.

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1) Patterns shall be located not more than 1/16 inch off parallel from the locating glass edge.

2) Frit shall be evenly applied and consistent in tone.

D. Glass Type (GL-08A): NOB Canopy

1. Overall Unit Thickness: 26 mm

2. Lite 1: Laminated glass with 2 plies of 12 mm, heat-strengthened ultraclear (low iron) float glass bonded with ionoplast interlayer.

a. Interlayer: 2.29 mm clear ionoplast interlayers

b. Printed frit pattern on the number 3 surface.

c. Printed pattern and color as directed by Project Director/COR.

d. Basis of Design Frit Coating: Interpane Ipdecor K.

E. Glass Type (GL-08B): All CAC Canopy Glass:

1. Overall Unit Thickness: 18 mm

2. Lite 1: Laminated glass with 2 plies of 8 mm, tempered ultraclear (low iron) float glass bonded with ionoplast interlayer, heat soak tested

a. Interlayer: 2.29 mm clear ionoplast interlayer.

b. Printed frit pattern on the #3 surface.

c. Printed pattern and color as directed by Project Director/COR.

d. Basis of Design Frit Coating: Interpane Ipadecor K.

2.3 OTHER CANOPY COMPONENTS

A. Spacers, Setting Blocks, Gaskets: Permanent, nonmigrating types of material and in hardness recommended by the canopy manufacturer and complying with the performance requirements.

B. Slip and Separator Gaskets:

1. Bolted Slip Joints: Non-metallic, low friction material bearing temperature and moisture resistances and low abrasion properties as required to suit performance requirements.

2. Non-Bolted Slip Joints: Non-corrosive, non-toxic impregnated felt, or butyl tape with a pressure sensitive adhesive on one surface which is formulated for proper adhesion to metals indicated; gasket shall bear temperature and moisture resistance properties as required to suit performance criteria; thickness and width as required.

C. Flashing: Install flashing fabricated from specified stainless steel material to the profiles indicated. Flashing shall be furnished in longest lengths possible to minimize vertical joints.

Provide concealed fastening of flashing as indicated.

1. Laps and joints, where required, shall be single lock seamed and soldered.

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2. Solder for Flashing: Zinc/tin or pure zinc with zinc chloride rosin flux type unless otherwise recommended by the sheet metal manufacturer.

D. Self-Adhering, High-Temperature Sheet (For Gutter Underlining): 0.76 to 1.0 mm thick minimum, consisting of slip-resisting polyethylene-film top surface laminated to layer of butyl or SBS-modified asphalt adhesive, with release-paper backing; cold applied. Provide primer when recommended by underlayment manufacturer.

2.4 FABRICATION

A. General: Fabricate the canopies to the designs, shapes, and sizes shown using the materials specified and shown to produce assemblies which meet or exceed the performance requirements. To the greatest extent possible complete fabrication, assembly, finishing, hardware applications and other work before shipment to Project site.

1. Architecturally Exposed Structural Stainless Steel Members: Refer to the structural drawings for requirements applicable to the fabrication of structural stainless steel to support the canopies. Connections shall be of the types shown on the Drawings. Design connections for the canopy components connected to the structural stainless steel for the capacities and requirements as required by the specified performance requirements. All connections shall be designed and detailed by the canopy fabricator.

B. Fabricate components to allow for expansion and contraction, field adjustment, and minimum clearance and shimming. Fit and secure corners and joints rigidly with fasteners, internal reinforcement or welding. Make exposed framing and trim joints and connections flush, hairline and weatherproof. Match exposed work to produce continuity of line.

1. Complete the welding, cutting, drilling and fitting of joints prior to finishing. Weld with electrodes and by methods recommended by the steel and stainless steel manufacturers in accordance with applicable recommendations of the AISC and AWS. Use only methods which will avoid distortion or discoloration of exposed faces. Grind weld areas smooth and restore mechanical finish condition before proceeding with other treatment.

a. Exposed Stainless Steel Components: In addition to the above requirements comply with the following:

1) All exposed edges and ends of plates or bars must be square and smooth, free of cutting marks, shear distortion, burrs, and nicks.

2) Provide uniform and consistent joints with all exposed copes, miters and butt cuts.

3) Select weld sizes, sequence, and equipment so as to limit distortions to within allowable tolerances.

4) Continuously weld joints in exposed stainless steel members to extent as accepted by Project Director/COR on shop drawings.

5) Do not apply erection marks, symbols, or painted notes to exposed surfaces.

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C. Prepare components to receive anchor and connection devices and fasteners. Where fasteners exposed to view from interior are required, provide bolts with finish matching the exposed plate fittings.

1. For carbon and stainless steel members drill or punch holes at right angles to the surface of the metal. Hole sizes shall be drilled to required bolt diameter with maximum size of fastener holes in accordance with AISC specifications. Do not make or enlarge holes by burning. Holes shall be clean-cut without torn or ragged edges. Remove outside burrs resulting from drilling operations.

2.5 FABRICATION OF GLASS AND OTHER GLAZING PRODUCTS

A. Fabricate glass and other glazing products in sizes required to glaze openings indicated for Project, with edge and face clearances, edge and surface conditions, and bite, complying with recommendations of product manufacturer and referenced glazing standard as required to comply with system performance requirements. All edgework, holes and notches shall be completed before any heat treatments.

1. Cutting Tolerances:

a. Dimensional tolerance on glass panel size shall be +/- 1 mm of the theoretical dimension required.

b. Squareness of each panel shall be within 3 mm.

c. Bow allowance shall be 0.1%.

d. The positional tolerances on all holes shall be +/- 1 mm from a single datum point.

2. Edge and Surface Conditions: Comply with the recommendations of AAMA "Structural Properties of Glass" for "clean-cut" edges, except comply with manufacturer's recommendations when they are at variance therewith. Provide forms of edge and surface treatment indicated below:

a. All edges shall be flat with an arrissed edge profile (small bevel of uniform width not exceeding 1.5 mm at an angle of approximately 45 degrees to the surface of the glass) with a polished (surface is reflective in appearance similar to the major surface of the glass) surface.

3. Cutting: Do not nip glass edges. Factory cut float glass 12mm (1/2 inch) and thicker.

Edges may be wheel cut or sawed and seamed at manufacturer's option. Do not cut, seam, nip or abrade tempered glass.

B. Holes: To the greatest extent possible countersink all bolted connections on the exterior weathering glass surfaces. Drill, countersink, and chamfer holes using tooling, materials and methods which are selected and applied to prevent spalling of the cut glass surfaces at holes.

The internal surface of holes shall be smooth with minimal roughness from drilling operations.

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2.6 EXPOSED STAINLESS-STEEL FINISHES

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

1. Grind and polish surfaces to produce uniform, non-directional textured, finish indicated, free of cross scratches.

B. Stainless-Steel Finish:

1. Typical (MT-53): Non-directional, uniformly textured glass bead-blasted type 316L alloy stainless .

2. Glass Anchors (Fittings): As machined.

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

2.7 COATINGS FOR CONCEALED METAL SURFACES

A. General: The following protective coating shall be applied to surfaces of metals which are to be concealed in the construction:

1. Where dissimilar metal surfaces are to be in contact with each other or in contact with dissimilar materials such as masonry or concrete, provide one of the following:

a. Bituminous Paint: Cold-applied, non-sagging, asphalt-mastic paint complying with SSPC-Paint 12 requirements, except containing no asbestos. Apply in two coats for an overall minimum dry film thickness of 25 mils.

b. Zinc Rich Primer: Organic zinc-rich primer, complying with SSPC-Paint 20.

PART 3 - EXECUTION

3.1 PREPARATION

A. Coordinate the canopy work with the work of other Sections and provide items to be placed during the installation of other work at the proper time to avoid delays in the work.

3.2 EXAMINATION

A. Examine the substrates, adjoining construction, and conditions under which the Work is to be installed.

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

3.3 INSTALLATION

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A. General: Comply with manufacturer's written instructions for protecting, handling, and installing the glass canopy. Do not install damaged components. Fit joints to produce hairline joints free of burrs and distortion. Rigidly secure nonmovement joints. Loose particles present or resulting from fabrication or field cutting and drilling shall be removed by blowing out joints with oil free compressed air, or by vacuuming joints. Remove protective coatings, oils from cutting and drilling operations, and residue on metallic surfaces with solvents that leave no residue. Do not allow solvent to air dry without wiping. Use only lint free towels for wiping of surfaces. Wipe metal surfaces with IPA (isopropyl alcohol) or xylene unless otherwise required by compatibility and adhesion testing results. Seal joints watertight. Clean excess joint sealants from finished surfaces.

1. Cut and trim component parts of the glass canopy work during erection only with the approval of the manufacturer or fabricator, and in accordance with his recommendations.

Restore finish completely to protect material and remove all evidence of cutting and trimming. Remove and replace members where cutting and trimming has impaired strength or appearance, as directed by Project Director/COR.

2. Set components within the erection tolerances with uniform joints. Place components on shims and fasten to supporting substrates using bolts and similar fasteners. Use stainless steel shims at structural connections only. U shaped shims at structural connections are not permitted. Use aluminum, stainless steel, or high impact polystyrene shims at other connections.

3. Do not erect components which are warped, deformed, bowed, dented, defaced or otherwise damaged as to impair its strength or appearance. Remove and replace members damaged in the process of erection.

4. Coat concealed surfaces of dissimilar materials, and any ferrous metal components, with a heavy coating of bituminous paint, zinc rich primer or other separation in accordance with manufacturer's recommendations.

5. No holes or slots shall be burned, cut into, or field drilled in any building framing member without the written acceptance of the structural engineer.

6. Make up threaded connections tight so that threads are entirely concealed.

7. A technical representative of the glass canopy manufacturer shall be present during the entire erection of the glass canopy work.

B. Glass Canopy Framing Erection: Set glass canopy framing members in strict accordance with the approved shop drawings in place, plumb, accurately aligned, and to angles and slopes shown, and within the tolerances indicated. Secure in place by bolting to supporting structure, unless otherwise indicated. Fit components accurately together to form tight joints.

C. Glass Canopy to Building Construction Gutter Fabrication and Installation: Fabricate concealed gutters from stainless steel sheet formed to provide a continuous, watertight connection from the canopy to the vertical Chancery and CAC building cladding. There shall be no longitudinal seams. Gutters shall have ends joined together by 20 mm wide locked and soldered cross seams. Slope to gutters to rain outlets. Coordinate and install gutter and rain drainage work, to provide leakproof, and noncorrosive canopy gutter installation. Form circular shaped outlet

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tubes to the size required to fit into the storm piping downspout. Outside dimension of the outlet tube shall be 3 mm less than the inside diameter of the storm piping downspout. Upper ends of outlet tubes shall be flanged 12 mm and soldered to the base of the gutter. Outlet tubes shall extend not less than 100 mm into the storm piping downspout.

D. Horizontal (Overhead Point Supported and Patch Fitting Supported Glass Canopies) Glass Erection: Attach glass to framing members using erection sequence as required by the glass system designer, in strict accordance with the approved shop drawings. Glass units shall be accurately aligned, and set to angles and slopes shown, with uniform joints and within the tolerances specified. The installation of each light of glass shall be watertight and capable of withstanding temperature changes, and live loading, specified without failure of any kind including loss or breakage of glass, failure of seal, exudation of sealant and excessive deterioration of glazing materials.

1. Unless otherwise recommended by the system designer, fasten glass anchors to laminated glass under controlled conditions prior to hoisting and fixing to each framing support.

Follow the system designers recommendations for controlled tightening of glass anchors to glass.

2. Set glass lites with uniform pattern, draw, bow, and similar characteristics producing the greatest possible degree of uniformity in appearance. Fix distance between horizontal edges of adjacent glass lites so that the joints are of even width and that their outside faces are in alignment.

E. Install perimeter sealant to comply with requirements of Section 07 92 00 "Exterior Joint Sealants," unless otherwise indicated.

F. Concealed Sealing Components: Apply sealant and gasket components which are integral to the glass canopies in strict accordance with the each component manufacturers printed instructions. Before applying components remove all dust, dirt, moisture, and other foreign matter which will be deleterious to the intended performance of the component. Mask adjoining exposed surfaces to avoid spilling, dripping, dropping or other unintended contact of the sealing components onto adjacent exposed surfaces.

3.4 ERECTION TOLERANCES

A. Each canopy shall be erected to accommodate the dimensional tolerances of the structural frame and the adjacent cladding while providing the following as installed tolerances:

1. From Plumb: 3 mm in 3 m.

2. Variation from slope, or level, shown: +/- 3 mm in any 6 m run, non-cumulative.

3. Alignment: Limit the offset from true alignment between two members abutting end-to-end, in line edge-to-edge, or separated by less than 75 mm to less than 0.75 mm.

4. Location: Install framing with maximum deviation from measured theoretical plane or location of any member at any location to 6 mm in any column to column space.

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3.5 ANCHORAGE

A. Anchorage of the canopy work to the structure and adjacent cladding shall be in accordance with the accepted shop drawings.

3.6 WELDING

A. Weld with electrodes and by methods recommended by manufacturer of material being welded, and in accordance with AWS D1.1 for concealed steel members.

B. Welds and adjacent metal areas shall be thoroughly cleaned and coated with a single coat of bituminous paint.

3.7 REMOVAL OF DEBRIS

A. All debris caused by, or incidental to, the erection of the canopy work shall be removed from the site and disposed of legally.

3.8 CLEANING

A. Clean metal surfaces promptly after installation, exercising care to avoid damage to factory finished exposed surfaces.

B. Wash glass on both faces not more than 4 days prior to date scheduled for inspections that establish date of Substantial Completion. Wash glass as recommended by glass manufacturer.

Remove excess glazing and sealant compounds, dirt, and other substances.

C. Stainless-Steel Touchup: Immediately after erection, smooth abraded areas of stainless steel and polish and clean to match undamaged finish.

3.9 PROTECTION

A. Institute protective measures required throughout the remainder of the construction period to ensure that canopy work will be without damage or deterioration at time of acceptance.

END OF SECTION 107316