ARFS088000.NY11.pdf

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SECTION 088000 - GLAZING

PART 1 - GENERAL

1.01 RELATED DOCUMENTS:

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and DIVISION 01 Specification Sections, apply to this Section.

1.02 SUMMARY:

A. Section includes glazing for the following products and applications, including those specified in other Sections where glazing requirements are specified by reference to this Section:

1. Windows.

2. Doors.

3. Storefront framing.

4. Glazed entrances.

5. Interior borrowed lites.

B. Related Sections:

1. DIVISION 08 Section "Wood Flush Door Entrances."

2. DIVISION 08 Section "Aluminum Windows."

C. American Architectural Manufacturers Association:

1. AAMA 800-2005 - Voluntary Specifications and Test Methods for Sealants.

2. AAMA GDSG-1-1987 - Glass Design for Sloped Glazing.

3. AAMA TIR-A7-1983 - Sloped Glazing Guidelines.

D. American National Standards Institute:

1. ANSI Z97.1-2004 - Safety Glazing Materials Used in Buildings - Safety Performance

Specifications and Methods of Test.

E. American Society of Civil Engineers/Structural Engineering Institute:

1. ASCE/SEI 7-2005 - Minimum Design Loads for Buildings and Other Structures.

F. ASTM International:

1. ASTM C509-00 - Specification for Elastomeric Cellular Preformed Gasket and Sealing Material.

2. ASTM C542-05 - Specification for Lock-Strip Gaskets.

3. ASTM C716-00 - Specification for Installing Lock-Strip Gaskets and Infill Glazing

Materials.

4. ASTM C864-05 - Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers.

5. ASTM C920-05 - Specification for Elastomeric Joint Sealants.

6. ASTM C1021-01 - Practice for Laboratories Engaged in the Testing of Building Sealants.

7. ASTM C1036-01 - Specification for Flat Glass.

8. ASTM C1048-04 - Specification for Heat-Treated Flat Glass - Kind HS, Kind FT Coated and Uncoated Glass.

9. ASTM C1087-00 - Test Method for Determining Compatibility of Liquid-Applied

Sealants with Accessories Used in Structural Glazing Systems.

10. ASTM C1115-00 - Specification for Dense Elastomeric Silicone Rubber Gaskets and

Accessories.

11. ASTM C1172-03 - Specification for Laminated Architectural Flat Glass.

12. ASTM C1281-03 - Specification for Preformed Tape Sealants for Glazing Applications.

13. ASTM C1330-02 - Specification for Cylindrical Sealant Backing for Use with Cold

Liquid Applied Sealants.

14. ASTM C1376-03 - Specification for Pyrolytic and Vacuum Deposition Coatings on Flat

Glass.

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15. ASTM E1300-04 - Practice for Determining Load Resistance of Glass in Buildings.

16. ASTM E1886-05 - Test Method for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials.

17. ASTM E1996-06 - Specification for Performance of Exterior Windows, Curtain Walls, Doors and Impact Protective Systems Impacted by Windborne Debris in Hurricanes.

18. ASTM E2190-02 - Specification for Insulating Glass Unit Performance and Evaluation.

G. Code of Federal Regulations:

1. 16 CFR 1201-2006 - Safety Standard for Architectural Glazing Materials.

2. 40 CFR 59, Subpart D-2005 - National Volatile Organic Compound Emission Standards for Architectural Coatings.

H. Glass Association of North America:

1. Engineering Standards Manual. 2001.

2. Glazing Manual. 2004.

3. Laminated Glazing Reference Manual. 2006.

I. Insulating Glass Manufacturers Alliance:

1. IGMA TB-3001-2001 - Guidelines for Sloped Glazing.

2. SIGMA TM-3000-1990 (Revised 2004) - North American Glazing Guidelines for Sealed

Insulating Glass Units for Commercial and Residential Use.

J. International Code Council:

1. International Building Code. 2009.

K. Lawrence Berkeley National Laboratory; Environmental Energy Technologies Division;

Building Technologies Department; Windows & Daylighting Group:

1. WINDOW 5.2 - A PC Program for Analyzing Window Thermal Performance (Available at http://windows.lbl.gov/software).

L. National Fenestration Rating Council:

1. NFRC 100-2004 - Procedure for Determining Fenestration Product Thermal Properties (Currently Limited to U-Factors).

2. NFRC 200-2004 - Procedure for Determining Fenestration Product Solar Heat Gain Coefficients at Normal Incidence.

3. NFRC 300-2004 - Procedures for Determining Solar Optical Properties of Simple Fenestration Products.

M. National Fire Protection Association:

1. NFPA 252-2003 - Fire Tests of Door Assemblies.

2. NFPA 257-2000 - Fire Test for Window and Glass Block Assemblies.

1.03 DEFINITIONS:

A. Glass Manufacturers: Firms that produce primary glass, fabricated glass, or both, as defined in referenced glazing publications.

B. Glass Thicknesses: Indicated by thickness designations in millimeters according to

ASTM C1036.

C. Interspace: Space between lites of an insulating-glass unit.

1.04 PERFORMANCE REQUIREMENTS:

A. General: Installed glazing systems shall withstand normal thermal movement and wind and impact loads (where applicable) without failure, including loss or glass breakage attributable to the following: defective manufacture, fabrication, or installation; failure of sealants or gaskets to remain watertight and airtight; deterioration of glazing materials; or other defects in

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construction. Comply with ASTM E1300. Design of blast resistant glazing systems shall comply with ASTM F2248 and UFC 4-010-01.

B. Delegated Design: Glass thicknesses specified or indicated on Drawings are minimum.

Confirm glass thicknesses by analyzing Project loads and in service conditions. Glass thicknesses for blast resistant glazing systems shall be determined in accordance with ASTM F2248, ASTM E1300 and UFC 4-010-01.

C. See structural drawings for wind loading diagrams and wind borne debris code requirements.

D. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes acting on glass framing members and glazing components. Base engineering calculation on materials' actual surface temperatures due to both solar heat gain and nighttime sky heat loss.

1. Temperature Change: 120ºF (67ºC), ambient; 180ºF (100ºC), material surfaces.

1.05 ACTION SUBMITTALS:

A. Product Data: For each glass product and glazing material indicated.

B. LEED Submittals:

1. Product Data for Credit IEQ 4.1: For glazing sealants used inside the weatherproofing system, documentation including printed statement of VOC content.

C. Glass Samples: For each type of the following products; 12 inches (300 mm) square.

1. Spandrel Glass

2. Fire-resistive glazing products.

3. Insulating, blast glass assembly including, tinted, Low-E coated and laminated glass with clear interlayer and airspace.

D. Glazing Schedule: List glass types and thicknesses for each size opening and location. Use same designations indicated on Drawings.

E. Delegated-Design Submittal: For glass indicated to comply with performance requirements and design criteria, including analysis data signed and sealed by the qualified professional engineer responsible for their preparation.

1.06 INFORMATIONAL SUBMITTALS:

A. Qualification Data: For installers and manufacturers of insulating-glass units with sputter-coated, low-e coatings.

B. Product Certificates: For glass and glazing products, from manufacturer.

C. Product Test Reports: Based on evaluation of comprehensive tests performed by a qualified testing agency, for insulating, blast glass assembly.

D. Preconstruction adhesion and compatibility test report.

E. Warranties: Sample of special warranties.

1.07 QUALITY ASSURANCE:

A. Manufacturer Qualifications for Insulating-Glass Units with Sputter-Coated, Low-E Coatings:

A qualified insulating-glass manufacturer who is approved by coated-glass manufacturer.

B. Installer Qualifications: A qualified installer who employs glass installers for this Project who are certified under the National Glass Association's Certified Glass Installer Program.

C. Glass Testing Agency Qualifications: A qualified independent testing agency accredited according to the NFRC CAP 1 Certification Agency Program.

D. Sealant Testing Agency Qualifications: An independent testing agency qualified according to

ASTM C1021 to conduct the testing indicated.

E. Source Limitations for Glass: Obtain coated float glass, laminated glass, tempered glass and insulating glass from single source from single manufacturer for each glass type.

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F. Source Limitations for Glazing Accessories: Obtain from single source from single manufacturer for each product and installation method.

G. Glazing Publications: Comply with published recommendations of glass product manufacturers and organizations below, unless more stringent requirements are indicated.

Refer to these publications for glazing terms not otherwise defined in this Section or in referenced standards.

1. GANA Publications: GANA's "Laminated Glazing Reference Manual" and GANA's

"Glazing Manual."

2. IGMA Publication for Insulating Glass: SIGMA TM-3000, "North American Glazing

Guidelines for Sealed Insulating Glass Units for Commercial and Residential Use."

H. Safety Glazing Labeling: Where safety glazing labeling is indicated, permanently mark glazing with certification label of the SGCC or another certification agency acceptable to authorities having jurisdiction or the manufacturer. Label shall indicate manufacturer's name, type of glass, thickness, and safety glazing standard with which glass complies.

I. Fire-Protection-Rated Glazing Labeling: Permanently mark fire-protection-rated glazing with certification label of a testing agency acceptable to authorities having jurisdiction. Label shall indicate manufacturer's name, test standard, whether glazing is for use in fire doors or other openings, whether or not glazing passes hose-stream test, whether or not glazing has a temperature rise rating of 450ºF (250ºC), and the fire-resistance rating in minutes.

J. Insulating-Glass Certification Program: Permanently marked either on spacers or on at least one component lite of units with appropriate certification label of IGCC.

1.08 DELIVERY, STORAGE, AND HANDLING:

A. Protect glazing materials according to manufacturer's written instructions. Prevent damage to glass and glazing materials from condensation, temperature changes, direct exposure to sun, or other causes.

B. Comply with insulating-glass manufacturer's written recommendations for venting and sealing units to avoid hermetic seal ruptures due to altitude change.

1.09 PROJECT CONDITIONS:

A. Environmental Limitations: Do not proceed with glazing when ambient and substrate temperature conditions are outside limits permitted by glazing material manufacturers and when glazing channel substrates are wet from rain, frost, condensation, or other causes.

1. Do not install glazing sealants when ambient and substrate temperature conditions are outside limits permitted by sealant manufacturer or below 40ºF (4.4ºC).

1.10 WARRANTY:

A. General: Warranties specified in this Article shall not deprive the Government of other rights the Government may have under other provisions of the Contract Documents and will be in addition to and run concurrent with other warranties made by the Contractor under requirements of the Contract Documents.

B. Manufacturer's Special Warranty for Coated-Glass Products: Manufacturer's standard form in which coated-glass manufacturer agrees to replace coated-glass units that deteriorate within specified warranty period. Deterioration of coated glass is defined as defects developed from normal use that are not attributed to glass breakage or to maintaining and cleaning coated glass contrary to manufacturer's written instructions. Defects include peeling, cracking, and other indications of deterioration in coating.

1. Warranty Period: 10 years from date of Manufacture.

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C. Manufacturer's Special Warranty on Laminated Glass: Manufacturer's standard form in which laminated-glass manufacturer agrees to replace laminated-glass units that deteriorate within specified warranty period. Deterioration of laminated glass is defined as defects developed from normal use that are not attributed to glass breakage or to maintaining and cleaning laminated glass contrary to manufacturer's written instructions. Defects include edge separation, delamination materially obstructing vision through glass, and blemishes exceeding those allowed by referenced laminated-glass standard.

1. Warranty Period: 10 years from date of Manufacture.

D. Manufacturer's Special Warranty on Insulating Glass: Manufacturer's standard form in which insulating-glass manufacturer agrees to replace insulating-glass units that deteriorate within specified warranty period. Deterioration of insulating glass is defined as failure of hermetic seal under normal use that is not attributed to glass breakage or to maintaining and cleaning insulating glass contrary to manufacturer's written instructions. Evidence of failure is the obstruction of vision by dust, moisture, or film on interior surfaces of glass.

1. Warranty Period: 10 years from date of Manufacture.

PART 2 - PRODUCTS

2.01 GLASS PRODUCTS, GENERAL:

A. Thickness: Where glass thickness is indicated, it is a minimum. Provide glass lites in thicknesses as needed to comply with requirements indicated.

1. Thickness of Tinted Glass: Provide same thickness for each tint color indicated throughout Project.

B. Strength: Where float glass is indicated, provide annealed float glass, Kind HS heat-treated float glass, or Kind FT heat-treated float glass as needed to comply with "Performance Requirements" Article. Where heat-strengthened glass is indicated, provide Kind HS heat-treated float glass or Kind FT heat-treated float glass as needed to comply with "Performance Requirements" Article. Where fully tempered glass is indicated, provide Kind FT heat-treated float glass.

C. Windborne-Debris-Impact Resistance: Provide exterior glazing that passes [basic] [enhanced]-protection testing requirements in ASTM E1996 for [Wind Zone 1] [Wind Zone 2] [Wind Zone 3] [Wind Zone 4] when tested according to ASTM E1886. Test specimens shall be no smaller in width and length than glazing indicated for use on the Project and shall be installed in same manner as glazing indicated for use on the Project.

1. Large-Missile Test: For glazing located within 30 feet (9.1 m) of grade.

2. Small-Missile Test: For glazing located more than 30 feet (9.1 m) above grade.

3. Large-Missile Test: For all glazing, regardless of height above grade.

D. Thermal and Optical Performance Properties: Provide glass with performance properties specified, as indicated in manufacturer's published test data, based on procedures indicated below:

1. For monolithic-glass lites, properties are based on units with lites of thickness indicated.

2. For laminated-glass lites, properties are based on products of construction indicated.

3. For insulating-glass units, properties are based on units of thickness indicated for overall unit and for each lite.

4. U-Factors: Center-of-glazing values, according to NFRC 100 and based on LBL's

WINDOW 5.2 computer program, expressed as Btu/sq. ft. x h x ºF (W/sq. m x K).

5. Solar Heat-Gain Coefficient and Visible Transmittance: Center-of-glazing values, according to NFRC 200 and based on LBL's WINDOW 5.2 computer program.

6. Visible Reflectance: Center-of-glazing values, according to NFRC 300.

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2.02 GLASS PRODUCTS:

A. Float Glass: ASTM C1036, Type I, Quality-Q3, Class I (clear) unless otherwise indicated.

1. Products: Subject to compliance with requirements, provide one of the following:

a. AFG Industries, Inc.; Krystal Klear.

b. Guardian Industries Corp.; Ultrawhite.

c. Pilkington North America; Optiwhite.

d. PPG Industries, Inc.; Starphire.

B. Heat-Treated Float Glass: ASTM C1048; Type I; Quality-Q3; Class I (clear) unless otherwise indicated; of kind and condition indicated.

1. Fabrication Process: By horizontal (roller-hearth) process with roll-wave distortion parallel to bottom edge of glass as installed unless otherwise indicated.

2. For uncoated glass, comply with requirements for Condition A.

3. For coated vision glass, comply with requirements for Condition C (other coated glass).

C. Polished Wired Glass: ASTM C1036, Type II, Class 1 (clear), Form 1, Quality-Q6, complying with ANSI Z97.1, Class C.

D. Tempered Glass: ASTM C1048, Kind FT (fully tempered), Type II, Class 1 (clear), Form 3;

Quality-Q6.

E. Uncoated Tinted Float Glass: Class 2, complying with other requirements specified.

1. Basis-of-Design Product: Subject to compliance with requirements, provide PPG

Solarbronze or comparable product by one of the following:

a. Pilkington North America.

b. Cardinal Glass Industries

2. Glass: Tinted annealed.

3. Tint Color: Bronze.

4. Visible Light Transmittance: 47%

F. Reflective-Coated Vision Glass: ASTM C1376, coated by vacuum deposition (sputter-coating) process, and complying with other requirements specified.

1. Basis-of-Design Product: Subject to compliance with requirements, provide PPG

Solarban 70XL Low-E; or comparable product by one of the following:

a. Pilkington North America.

b. Cardinal Glass Industries

2. Kind: Kind CV (Low-E coated vision glass)

3. Glass: Clear annealed.

4. Visible Light Transmittance: 64%.

5. Outdoor Visible Reflectance: 12%.

G. Ceramic-Coated Spandrel Glass: ASTM C1048, Condition B, Type I, Quality-Q3, and complying with other requirements specified.

1. Products: Manufacturer and color to match uncoated tinted float glass specified above.

2. Glass: Tinted annealed.

2.03 LAMINATED GLASS:

A. Laminated Glass: ASTM C1172, and complying with testing requirements in 16 CFR 1201 for

Category II materials, and with other requirements specified. Use materials that have a proven record of no tendency to bubble, discolor, or lose physical and mechanical properties after fabrication and installation.

1. Construction: Laminate glass with polyvinyl butyral interlayer (PVB) to comply with interlayer manufacturer's written recommendations.

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2. Interlayer Thickness: Provide thickness not less than that indicated and as needed to comply with requirements.

3. Interlayer Color: Clear unless otherwise indicated.

B. Windborne-Debris-Impact-Resistant Laminated Glass: ASTM C1172, and complying with testing requirements in 16 CFR 1201 for Category II materials, with "Windborne-Debris- Impact Resistance" Paragraph in "Glass Products, General" Article, and with other requirements specified. Use materials that have a proven record of no tendency to bubble, discolor, or lose physical and mechanical properties after fabrication and installation.

1. Construction: Laminate glass with[ one of] the following to comply with interlayer manufacturer's written recommendations:

a. Polyvinyl butyral interlayer.

b. Polyvinyl butyral interlayers reinforced with polyethylene terephthalate film.

c. Ionoplast interlayer.

d. Cast-in-place and cured-transparent-resin interlayer.

e. Cast-in-place and cured-transparent-resin interlayer reinforced with polyethylene terephthalate film.

2. Interlayer Thickness: Provide thickness not less than that indicated and as needed to comply with requirements.

3. Interlayer Color: Clear unless otherwise indicated.

C. Glass: Comply with applicable requirements in "Glass Products" Article as indicated by designations in "Laminated-Glass Types" Article.

2.04 INSULATING GLASS:

A. General: Factory-assembled units consisting of sealed lites of glass separated by a dehydrated interspace, qualified according to ASTM E2190, and complying with other requirements specified.

B. Sealant Edged Insulating Glass:

1. Inboard lites shall be laminated glass as specified above.

2. Outboard lites shall be reflective-coated vision glass as specified above.

3. Fabricate units with a permanent hermetically sealed, dry air, or gas filled space. Provide an edge seal consisting of twin primary sealant beads of polyisobutylene; positioned and retained by a tubular aluminum or galvanized steel spacer bar frame with soldered/welded sealed corners, and filled with desiccant with breather ports into sealed space; with secondary edge seals of silicone polysulfide or hot melt butyl completely encapsulating outer face of spacer bar and sealed to the opposing sheets of glass.

C. Glass: Comply with applicable requirements in "Glass Products" Article and in "Laminated Glass" Article as indicated by designations in "Insulating-Glass Types" Article and in "Insulating-Laminated-Glass Types" Article.

2.05 FIRE-PROTECTION-RATED GLAZING:

A. Fire-Protection-Rated Glazing, General: Listed and labeled by a testing agency acceptable to authorities having jurisdiction, for fire-protection ratings indicated, based on testing according to NFPA 257 for window assemblies.

B. Laminated Glass with Intumescent Interlayers: Laminated glass made from multiple plies of uncoated, clear float glass; with intumescent interlayers; complying with testing requirements in 16 CFR 1201 for Category II materials.

1. Products: Subject to compliance with requirements, provide one of the following:

a. InterEdge, Inc., a subsidiary of AFG Industries, Inc.; Pyrobel.

b. Pilkington Group Limited (distributed by Technical Glass Products); PyroStop.

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c. Vetrotech Saint-Gobain; SGG Contraflam N2.

2.06 GLAZING GASKETS:

A. Dense Compression Gaskets: Molded or extruded gaskets of profile and hardness required to maintain watertight seal, made from[ one of] the following:

1. Silicone complying with ASTM C1115.

2. Thermoplastic polyolefin rubber complying with ASTM C1115.

B. Soft Compression Gaskets: Extruded or molded, closed-cell, integral-skinned silicone or thermoplastic polyolefin rubber gaskets complying with ASTM C509, Type II, black; of profile and hardness required to maintain watertight seal.

1. Application: Use where soft compression gaskets will be compressed by inserting dense compression gaskets on opposite side of glazing or pressure applied by means of pressure-glazing stops on opposite side of glazing.

C. Lock-Strip Gaskets: Neoprene extrusions in size and shape indicated, fabricated into frames with molded corner units and zipper lock-strips, complying with ASTM C542, black.

2.07 GLAZING SEALANTS:

A. General:

1. Compatibility: Provide glazing sealants that are compatible with one another and with other materials they will contact, including glass products, seals of insulating-glass units, and glazing channel substrates, under conditions of service and application, as demonstrated by sealant manufacturer based on testing and field experience.

2. Suitability: Comply with sealant and glass manufacturers' written instructions for selecting glazing sealants suitable for applications indicated and for conditions existing at time of installation.

3. Sealants used inside the weatherproofing system, shall have a VOC content of not more than 250 g/L when calculated according to 40 CFR 59, Subpart D (EPA Method 24).

4. Colors of Exposed Glazing Sealants: As selected by Contracting Officer from manufacturer's full range.

B. Glazing Sealant: Neutral-curing silicone glazing sealant complying with ASTM C920, Type S, Grade NS, Class 100/50, Use NT.

1. Products: Subject to compliance with requirements, provide one of the following:

a. Dow Corning Corporation; 790.

b. GE Advanced Materials - Silicones; SilPruf LM SCS2700.

c. May National Associates, Inc.; Bondaflex Sil 290.

d. Pecora Corporation; 890.

e. Sika Corporation, Construction Products Division; SikaSil-C990.

f. Tremco Incorporated; Spectrem 1.

2. Applications: <Describe types of glazing applications where this sealant is required>.

2.08 GLAZING TAPES:

A. Back-Bedding Mastic Glazing Tapes: Preformed, butyl-based, 100% solids elastomeric tape;

nonstaining and nonmigrating in contact with nonporous surfaces; with or without spacer rod as recommended in writing by tape and glass manufacturers for application indicated; and complying with ASTM C1281 and AAMA 800 for products indicated below:

1. AAMA 806.3 tape, for glazing applications in which tape is subject to continuous pressure.

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2.09 MISCELLANEOUS GLAZING MATERIALS:

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

B. Cleaners, Primers, and Sealers: Types recommended by sealant or gasket manufacturer.

C. Setting Blocks: Elastomeric material with a Shore, Type A durometer hardness of 85, plus or minus 5.

D. Spacers: Elastomeric blocks or continuous extrusions of hardness required by glass manufacturer to maintain glass lites in place for installation indicated.

E. Edge Blocks: Elastomeric material of hardness needed to limit glass lateral movement (side walking).

2.10 FABRICATION OF GLAZING UNITS:

A. Fabricate glazing units in sizes required to fit openings indicated for Project, with edge and face clearances, edge and surface conditions, and bite complying with written instructions of product manufacturer and referenced glazing publications, to comply with system performance requirements.

2.11 MONOLITHIC-GLASS TYPES:

A. Glass Type [GL-1]: Clear float glass.

1. Thickness: 6.0 mm.

B. Glass Type [GL-2]: fully tempered float glass.

1. Thickness: 6.0 mm.

2. Provide safety glazing labeling.

C. Glass Type [GL-3]: Polished wired glass.

1. Thickness: 6.0 mm.

2.12 INSULATING-GLASS TYPES:

A. Glass Type [GL-4]: Low-e-coated, clear insulating glass.

1. Overall Unit Thickness: 1 inch (25 mm).

2. Thickness of Each Glass Lite: 3.0 mm.

3. Outdoor Lite: Heat-strengthened float glass.

4. Interspace Content: Argon.

5. Indoor Lite: Float glass.

6. Low-E Coating: Sputtered on third surface.

7. Visible Light Transmittance: 38% minimum.

8. Winter Nighttime U-Factor: 0.28maximum.

9. Summer Daytime U-Factor: 0.26 maximum.

10. Solar Heat Gain Coefficient: 0.26 maximum.

11. Provide safety glazing labeling.

B. Glass Type [GL-5]: Low-e-coated, clear insulating glass.

1. Overall Unit Thickness: 1 inch (25 mm).

2. Thickness of Each Glass Lite: 3.0 mm.

3. Outdoor Lite: Fully tempered float glass.

4. Interspace Content: Argon.

5. Indoor Lite: Fully tempered float glass.

6. Low-E Coating: Sputtered on third surface.

7. Visible Light Transmittance: 38% minimum.

8. Winter Nighttime U-Factor: 0.28maximum.

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9. Summer Daytime U-Factor: 0.26maximum.

10. Solar Heat Gain Coefficient: 0.26 maximum.

11. Provide safety glazing labeling.

C. Glass Type [GL-6]: Ceramic-coated, tinted, insulating spandrel glass.

1. Overall Unit Thickness: 1 inch (25 mm).

2. Thickness of Each Glass Lite: 6.0 mm.

3. Outdoor Lite: tinted, Reflective-coated vision glass.

4. Interspace Content: Argon.

5. Indoor Lite: Clear float glass.

6. Coating Location: Third surface.

7. Winter Nighttime U-Factor: 0.28 maximum.

8. Summer Daytime U-Factor: 0.26 maximum.

9. Solar Heat Gain Coefficient: 0.26 maximum.

2.13 INSULATING-LAMINATED-GLASS TYPES:

A. Glass Type [GL-76]: Low-e-coated, tinted, insulating laminated glass.

1. Overall Unit Thickness: 1 inch (25 mm).

2. Thickness of Outdoor Lite: 3.0 mm.

3. Outdoor Lite: Tinted heat-strengthened float glass.

4. Interspace Content: Argon.

5. Indoor Lite: Clear laminated glass with two plies of heat-strengthened float glass.

a. Thickness of Each Glass Ply: 3.0 mm.

b. Interlayer Thickness: 0.030 inch (0.76 mm).

6. Low-E Coating: Sputtered on third surface.

7. Visible Light Transmittance: 38% minimum.

8. Winter Nighttime U-Factor: 0.28 maximum.

9. Summer Daytime U-Factor: 0.26 maximum.

10. Solar Heat Gain Coefficient: 0.26 maximum.

11. Provide safety glazing labeling.

2.14 POLYCARBONATE GLAZING TYPES:

A. Glass Type GL-7: Factory installed polycarbonate glazing.

1. Reference specification section 083613.

2.14 FIRE-PROTECTION-RATED GLAZING TYPES:

A. Glass Type GL-8: 60-minutefire-rated glazing; laminated glass with intumescent interlayers.

1. Provide safety glazing labeling.

PART 3 - EXECUTION

3.01 EXAMINATION:

A. Examine framing, glazing channels, and stops, with Installer present, for compliance with the following:

1. Manufacturing and installation tolerances, including those for size, squareness, and offsets at corners.

2. Presence and functioning of weep systems.

3. Minimum required face and edge clearances.

4. Effective sealing between joints of glass-framing members.

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

3.02 PREPARATION:

A. Clean glazing channels and other framing members receiving glass immediately before glazing. Remove coatings not firmly bonded to substrates.

B. Examine glazing units to locate exterior and interior surfaces. Provide green label for exterior surfaces and red label for interior surfaces. Do not use materials that will leave visible marks in the completed work.

3.03 GLAZING, GENERAL:

A. Comply with combined written instructions of manufacturers of glass, sealants, gaskets, and other glazing materials, unless more stringent requirements are indicated, including those in referenced glazing publications.

B. Adjust glazing channel dimensions as required by Project conditions during installation to provide necessary bite on glass, minimum edge and face clearances, and adequate sealant thicknesses, with reasonable tolerances.

C. Protect glass edges from damage during handling and installation. Remove damaged glass from Project site and legally dispose of off Project site. Damaged glass is glass with edge damage or other imperfections that, when installed, could weaken glass and impair performance and appearance.

D. Apply primers to joint surfaces where required for adhesion of sealants, as determined by preconstruction testing.

E. Install setting blocks in sill rabbets, sized and located to comply with referenced glazing publications, unless otherwise required by glass manufacturer. Set blocks in thin course of compatible sealant suitable for heel bead.

F. Do not exceed edge pressures stipulated by glass manufacturers for installing glass lites.

G. Provide spacers for glass lites where length plus width is larger than 50 inches (1270 mm).

1. Locate spacers directly opposite each other on both inside and outside faces of glass.

Install correct size and spacing to preserve required face clearances, unless gaskets and glazing tapes are used that have demonstrated ability to maintain required face clearances and to comply with system performance requirements.

2. Provide 1/8-inch (3-mm) minimum bite of spacers on glass and use thickness equal to sealant width. With glazing tape, use thickness slightly less than final compressed thickness of tape.

H. Provide edge blocking where indicated or needed to prevent glass lites from moving sideways in glazing channel, as recommended in writing by glass manufacturer and according to requirements in referenced glazing publications.

I. Set glass lites in each series with uniform pattern, draw, bow, and similar characteristics.

J. Set glass lites with proper orientation so that coatings face exterior or interior as specified.

K. Where wedge-shaped gaskets are driven into one side of channel to pressurize sealant or gasket on opposite side, provide adequate anchorage so gasket cannot walk out when installation is subjected to movement.

L. Square cut wedge-shaped gaskets at corners and install gaskets in a manner recommended by gasket manufacturer to prevent corners from pulling away; seal corner joints and butt joints with sealant recommended by gasket manufacturer.

3.04 TAPE GLAZING:

A. Position tapes on fixed stops so that, when compressed by glass, their exposed edges are flush with or protrude slightly above sightline of stops.

088000-12 ARFS088000.NY11

B. Install tapes continuously, but not necessarily in one continuous length. Do not stretch tapes to make them fit opening.

C. Cover vertical framing joints by applying tapes to heads and sills first and then to jambs.

Cover horizontal framing joints by applying tapes to jambs and then to heads and sills.

D. Place joints in tapes at corners of opening with adjoining lengths butted together, not lapped.

Seal joints in tapes with compatible sealant approved by tape manufacturer.

E. Do not remove release paper from tape until right before each glazing unit is installed.

F. Apply heel bead of elastomeric sealant.

G. Center glass lites in openings on setting blocks and press firmly against tape by inserting dense compression gaskets formed and installed to lock in place against faces of removable stops.

Start gasket applications at corners and work toward centers of openings.

H. Apply cap bead of elastomeric sealant over exposed edge of tape.

3.05 GASKET GLAZING (DRY):

A. Cut compression gaskets to lengths recommended by gasket manufacturer to fit openings exactly, with allowance for stretch during installation.

B. Insert soft compression gasket between glass and frame or fixed stop so it is securely in place with joints miter cut and bonded together at corners.

C. Installation with Drive-in Wedge Gaskets: Center glass lites in openings on setting blocks and press firmly against soft compression gasket by inserting dense compression gaskets formed and installed to lock in place against faces of removable stops. Start gasket applications at corners and work toward centers of openings. Compress gaskets to produce a weathertight seal without developing bending stresses in glass. Seal gasket joints with sealant recommended by gasket manufacturer.

D. Installation with Pressure-Glazing Stops: Center glass lites in openings on setting blocks and press firmly against soft compression gasket. Install dense compression gaskets and pressure-glazing stops, applying pressure uniformly to compression gaskets. Compress gaskets to produce a weathertight seal without developing bending stresses in glass. Seal gasket joints with sealant recommended by gasket manufacturer.

E. Install gaskets so they protrude past face of glazing stops.

3.06 SEALANT GLAZING (WET):

A. Install continuous spacers, or spacers combined with cylindrical sealant backing, between glass lites and glazing stops to maintain glass face clearances and to prevent sealant from extruding into glass channel and blocking weep systems until sealants cure. Secure spacers or spacers and backings in place and in position to control depth of installed sealant relative to edge clearance for optimum sealant performance.

B. Force sealants into glazing channels to eliminate voids and to ensure complete wetting or bond of sealant to glass and channel surfaces.

C. Tool exposed surfaces of sealants to provide a substantial wash away from glass.

3.07 LOCK-STRIP GASKET GLAZING:

A. Comply with ASTM C716 and gasket manufacturer's written instructions. Provide supplementary wet seal and weep system unless otherwise indicated.

3.08 CLEANING AND PROTECTION:

A. Protect exterior glass from damage immediately after installation by attaching crossed streamers to framing held away from glass. Do not apply markers to glass surface. Remove nonpermanent labels and clean surfaces.

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B. Protect glass from contact with contaminating substances resulting from construction operations. If, despite such protection, contaminating substances do come into contact with glass, remove substances immediately as recommended in writing by glass manufacturer.

C. Examine glass surfaces adjacent to or below exterior concrete and other masonry surfaces at frequent intervals during construction, but not less than once a month, for buildup of dirt, scum, alkaline deposits, or stains; remove as recommended in writing by glass manufacturer.

D. Remove and replace glass that is broken, chipped, cracked, or abraded or that is damaged from natural causes, accidents, and vandalism, during construction period.

E. Wash glass on both exposed surfaces in each area of Project not more than four days before date scheduled for inspections that establish date of Substantial Completion. Wash glass as recommended in writing by glass manufacturer.

END OF SECTION 088000