Attachment_3-GCD-AOP02-7J_SOW_4.2,_12_pages.pdf

1. SUBMITTALS

1.1 Tower Cab Glass;

Shop Drawing submittals which graphically show complete details of the proposed setting methods, mullion details, edge blocking, dimension of glass, dimension of openings, frame details and materials, and types of thickness of glass, coatings, coating position, laminates, and other aspects of the work.

Provide signed stamped calculations from registered structural engineer experience in design of glass on thermal range, wind loading, impact loading windows will be rated to withstand.

1.2 Product Data

Low-E Coated Insulated Annealed Glass Units;

Setting and Sealing Materials (see para 3.6 below)

Glazing Accessories (as applicable submit certificates from manufacturer attesting that units meet luminous and solar radiant transmission requiremets for heat absorbing glass)

Submit manufacturer of the glass lites and the fabricator of the insulating units.

Submit descriptive product data, handling and storage recommendations, installation instructions, and cleaning instructions from both the manufacturer of the glass lites and the fabricator of the insulating and laminated units.

1.3 Samples:

Setting and Sealing Materials including color.

Glazing Accessories.

1.4 Certificates

Fabricator Qualifications

Insulating Glass Certification

Installer Qualifications

Product Certificates for glazing material, accessories, setting and sealing materials.

Compatibility and adhesion test reports from sealant manufacturer indicating that glazing materials were tested for compatibility and adhesion with glazing sealants. Include sealant manufacturer's interpretation of test results relative to sealant performance and recommendations for primers and substrate preparation needed for adhesion.

Compatibility test report from manufacturer of insulating glass edge sealant indicating that glass edge sealants were tested for compatibility with other glazing materials including sealants, glazing tape, gaskets, setting blocks, and edge blocks.

Product test reports for each type of glazing sealant and gasket indicated, evidencing compliance with requirements specified.

1.5 Operation Maintenance Data

Maintenance Manuals

1.6 Warranty for insulating glass products

1.7 Fabricator Qualifications

Provide qualifications for fabricators for glass units who have successfully completed a minimum of five air traffic control tower cab glass projects similar in nature, size, and extent to this air traffic control tower including successful in-service performance and is a qualified insulating glass fabricator who is approved and certified by the glass manufacturer.

1.8 Installer Qualifications

Provide qualifications for an experienced installer who has installed similar glazing assemblies in material, design, and extent to the indicated for this Project with a record of successful in-service performance. Installer must be certified under the National Glass Association's certified glass installer program as level Y2 (Senior Glaziers) or level Y3 (Master Glazier). Equivalent or better certification may be considered if acceptable to the Contracting Officer.

1.9 Glass Engineer Qualifications:

Glass Engineer must be a registered professional engineer in a U.S.

state experienced in the design of glass who has successfully completed a minimum of 3 air traffic control tower cab glass projects and possesses no less than 5 years of experience with similar projects in nature, size, and extent to this air traffic control tower; being familiar with special requirements indicated.

2. GENERAL

Provide new windows that are engineered, produced, fabricated, and installed to withstand normal thermal movement, wind loading and impact loading without failure including loss of glass or glass breakage attributable to the following: defective manufacture, fabrication, and installation, failure of sealants or gaskets to remain watertight and airtight, deterioration of glazing materials, visual distortion, blockage of vision, and other defects impacting use or performance.

3. QUALITY ASSURANCE

3.1 Design, engineering, fabrication, and installation must comply with all applicable requirements.

3.2 Provide insulating glass units required to fit existing glazing opening sizes and shapes and existing outward slope as verified in the field with edge and face clearances, edge and surface conditions, and bite complying with written instructions manufacturer, fabricator and referenced glazing publications, to comply with system performance requirements.

3.3 Provide insulating glass units permanently marked either on spacers (permanent labels on glass not allowed) or at least one component of units with appropriate certification labels of inspecting and testing agency:

a. Insulating Glass Certification Council (IGCC).

b. Associated Laboratories, Inc. (ALI).

c. National Certified Testing Laboratories (NCTL).

3.4 Glazing Materials. Submit certificates signed by glazing

materials manufacturers certifying that their products comply with specified requirements. Submit certificates to indicate that materials meet specified requirements. Permanent marking safety glass approval on glass lower corner exposed to view is required unless that requirement is waived by contracting officer. Obtain glass from one source.

3.5 Glazing Accessories

Submit certificates from the manufacturers attesting that the accessories meet the project requirements including requirements set by the glass engineer designing the glass and supports.

Provide compatibility and adhesion test reports from manufacturer of insulating glass edge sealant indicating that glass edge sealants were tested for compatibility with other glazing materials including sealants, glazing tape, gaskets, setting blocks, and edge blocks.

Obtain glazing accessories from one source for each product and installation method indicated.

3.6 Setting and Sealing Materials.

Submit data from the manufacturer attesting that the sealant used in glazing is compatible with the laminated glass interlayer or primary and secondary sealants in insulated units where applicable.

Provide compatibility and adhesion test reports from sealant manufacturer; indicating that glazing materials were tested for compatibility and adhesion with glazing sealant.Include sealant manufacturer's test results relative to sealant performance and recommendations for primers and substrate preparation required for adhesion.

4. DELIVERY, STORAGE AND HANDLING

4.1 Deliver products to the site in unopened containers labeled plainly with manufacturers' names and brands, lot number color, date of manufacture, shelf life and cure time.

4.2 Tower cab glass must be boxed, crated, and shipped to the site in a vertical position or as directed by the fabricator. The tower cab glass must be stored in a vertical position against a sturdy support at an angle of approximately 7 degrees from vertical or as directed by the fabricator.

4.3 For insulating glass units that will be exposed to substantial altitude changes between location of fabrication and project site or in transit to project site, comply with insulating-glass manufacturer's written recommendations for preventing hermetic seal ruptures at any point or bowing inward or outward of glazing lites when installed due to pressure differentials between interspace air or gas pressure and ambient air pressure at project location.

4.4 Tower cab glass and setting materials must be stored in a safe, dry location with adequate ventilation free from heavy dust and must permit easy access for inspection and handling. Unpack glass at time of installation.

4.5 Unpack glass from the front of the case or container and avoid sliding the glass against itself or any un-cushioned materials. Stack individual lites on edge using clean, cushioned pads placed at the quarter points of the bottom edge. Protect all edges from impact and use a clean dry separating materials.

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

4.7 Do not install liquid glazing sealants when ambient and substrate temperature conditions are outside limits permitted by glazing sealant manufacturer or below 5 degrees C40 degrees F.

5. WARRANTY:

5.1 Provide 10-year manufacturer's and fabricator's warranty for tower cab glass.

a. Provide 10 year warranty for Insulating-Glass Products signed by the manufacturer and fabricator of insulating-glass units agreeing to replace insulating-glass units that deteriorate as defined in "Definitions" article for Deterioration of Insulating Glass, FOB point of manufacture, freight allowed project site, within 10-years after date of Final Acceptance.

Warranty for insulating glass covers only deterioration due to normal conditions of use as defined and not due to handling and installing.

Deterioration defined as failure includes, but is not limited to, failure of the hermetic seal under normal use and weather conditions due to causes other than glass breakage and improper practices for maintaining and cleaning insulating glass. Evidence of failure is the obstruction of vision by dust, moisture, film, or minerals on the surfaces of insulated glass facing the interspace or optical distortions (ghosting or double-images) not due to improper practices for maintaining and cleaning glass not in in compliance with the manufacturer's or fabricator's directions.

b. Provide warranty signed by coated-glass units the manufacturer committing to replace coated-glass units that deteriorate as defined in definitions article for Deterioration of Coated Glass, FOB point of manufacture, freight allowed project site, within 10-years after date of Final Acceptance. Warranty covers only deterioration due to normal conditions of use as defined and not due to handling and installing.

Deterioration for coated glass defined as defects developed from normal use and weather conditions that are attributed to the manufacturing process and not to causes other than glass breakage and practices for maintaining and cleaning coated glass contrary to fabricator's directions. Defects include peeling, cracking, and other indications of deterioration in metallic coating.

5.2 Provide new units for any units failing to comply with terms of this warranty within 45 working days after receipt of notice from Government.

6. PRODUCTS

6.1 Installed glazing system must withstand normal thermal movement and wind and impact loads 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 construction.

6.2 Structural Performance

Submit signed glass wind load calculations for all glass installations certifying compliance with wind loads requirements below, and as indicated on the drawings. The thickness of glass and support requirements must be determined using the most stringent requirements of both ASTM E1300 and

ASTM E2461.

For insulating glass units that will be exposed to substantial altitude changes after fabrication, insulated glass unit lites must be able to maintain parallel alignment to avoid optical distortions (ghosting /double images) when viewing through glass.

Design Wind Pressure: 92 MPH at 30’ = 29 PSF. Glass Engineer shall be required to confirm/validate this as part of submittal/calculations.

Maximum Lateral Deflection: Tower cab glass deflection shall not result in loss of edge support. If insulated units are being shipped through or installed at substantially different altitudes from the place of fabrication, deflection shall be limited to keep inner and outer lite parallel to preclude optical distortions (ghosting/double images).

6.3 Thermal Performance

Glazing must be able to withstand full calendar year project site climatic conditions and sun angles in coordination with tower cab mechanical systems such that conditions that could cause condensation on interior or exterior surfaces of the glass are prevented.

6.4 Glass Units/Materials

Tower cab glass thicknesses shown on attached or specified herein are minimums. The thickness of the tower cab glass must be determined the Glass Engineer complying with ASTM E2461 for a probability of breakage of 1 lite per 1000. Manufacturer must certify that glass can withstand all forces specified.

No on-site grinding or buffing of the glass is allowed. Glass edges must be clean cut, undamaged, and flat ground.

Glass shall be low-iron annealed float glass and must be ASTM C1036, Type I, Class I (Clear), quality q3; and with visible light transmission of not less than 91 percent and solar heat gain coefficient of not less than 0.90 for 6 mm 1/4 inch thickness. Heat strengthened, tempered, and chemically strengthened glass is not allowed

Allowable scratches: None.

Insulating-glass components must be as required to factory-assemble glass units with hermetically sealed dehydrated interspace, qualified according to ASTM E2190.

Sealing System: Units must be double sealed. Primary seal must be polyisobutylene; secondary seal must be silicone.

Spacer: Stainless steel. Space shall be dark bronze or black in color.

Desiccant: Molecular sieve or silica gel, or a blend of both. Neither breather tubes nor capillary tubes will be allowed.

The inner and outer lites of insulated glass units must be separated by a

12.7 mm 1/2-inch minimum hermetically sealed interspace. The entrapped air or gas must be dehydrated by a drying agent. Tower cab glass must be fabricated for use at the installation’s elevation above mean sea level (AMSL). Units must be free of any optical distortion at the time of installation.

Tolerances and clearances for units must be designed to prevent the transfer of stress in metal frames to the glass under all design conditions. Resilient setting blocks, spacer strips, clips, bolts, washers, angles, glazing sealants, and resilient channels must be of the type recommended in the glass manufacturer's approved written instructions.

Units shall be provided with a Low-Emissivity (Low-E) coating on glass.

Low-E coating selection must have minimal impact on the visible light transmittance. Low-E coating shall be a pyrolytic hard coating applied by glass manufacturer during the manufacturing process and shall be integral to the glass on first or fourth surface (one of the glass surfaces facing the interspace).

Winter Nighttime U-Factor: 0.31 maximum.

Summer Daytime U-Factor: 0.34 maximum.

Visible Light Transmittance: 91 percent minimum (see attach 3.1).

Solar Heat Gain Coefficient: not less than .90 per 6mm ¼”thickness.

6.5 Setting and Sealing Materials:

Provide setting and sealing materials as specified in the GANA Glazing manual, IGMA TM-3000, IGMA TB-3001, and manufacturer's recommendations, unless specified otherwise herein. Do not use metal sash putty, nonskinning compounds, nonresilient preformed sealers, or impregnated preformed gaskets. Materials exposed to view and unpainted must be a dark color to match mullions.

Elastomeric Sealant shall be ASTM C920, Type S, Grade NS, Class 12.5, Use G. Use for channel or stop glazing sash. Sealant must be chemically compatible with setting blocks, edge blocks, and sealing tapes, with sealants used in manufacture of insulating glass units. Sealant color must be as selected from manufacturer's samples.

Preformed Channels shall be neoprene, vinyl, or rubber, as recommended by the glass manufacturer for the project specific conditions.

Sealing Tapes shall be Preformed, semisolid, PVC-based material of proper size and compressibility for the particular condition, complying with ASTM D2287. Use sealing tape only where glazing rabbet is designed for tape and tape is recommended by the glass or sealant manufacturer.

Provide spacer shims for use with compressible tapes. Tapes must be chemically compatible with the product being set.

Setting Blocks and Edge Blocks shall be closed-cell neoprene setting blocks must be dense extruded type conforming to ASTM C509 and ASTM D395, Method B, Shore A durometer of 90. Profiles, lengths and locations must be as required and recommended in writing by glass manufacturer. Block color must be black.

Aluminum Framing Glazing Gaskets shall be permanent, elastic, non-shrinking, non-migrating, water tight, and weather tight.

Glazing Accessories shall be providd as required for a complete installation, including glazing points, clips, shims, angles, beads, and spacer strips. Provide anticorrosion metal accessories. Provide primer-sealers and cleaners as recommended by the glass and sealant manufacturers.

Provide units required to fit existing glazing opening sizes and shapes and existing outward slope indicated on the construction documents and as verified in the field with edge and face clearances, edge and surface conditions, and bite complying with written instructions manufacturer, fabricator and referenced glazing publications, to comply with system performance requirements.

7. EXECUTION

7.1 Comply with combined recommendations of manufacturers of glass, sealants, gaskets, and other glazing materials, except where more stringent requirements are indicated, including those in referenced glazing publications.

7.2 Provide necessary bite on glass, minimum edge and face clearances, and adequate sealant thicknesses, with reasonable tolerances. Adjust as required by Project conditions during installation.

7.3 Protect glass from edge damage during handling and installation as follows:

Use a rolling block in rotating glass units to prevent damage to glass corners. Do not impact glass with metal framing.

Use suction cups to shift glass units within openings; do not raise or drift glass with a pry bar. Rotate glass lites with flares or bevels on bottom horizontal edges so edges are located at top of opening, unless otherwise indicated by manufacturer's label.

7.4 Remove damaged glass from Project site and legally dispose of off site.

Damaged glass is glass with edge damage or other imperfections that, when installed, weaken glass and impair performance and appearance.

7.5 Apply primers to joint surfaces where required for adhesion of sealants, as determined by preconstruction sealant-substrate testing.

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

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

7.8 Provide spacers for glass as follows:

a. Locate spacers inside, outside, and directly opposite each other.

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

c. Provide manufacturer's recommended 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.

7.9 Provide edge blocking to comply with requirements of referenced glazing publications, unless otherwise required by glass manufacturer.

Prevent shifting of glass units within the mullion rabbets which could cause loss of required bite.

8. PREPARATION

8.1 Examine glass framing with glazier present for compliance with following:

Manufacturing and installation tolerances, including those for size, squareness, offsets at corners. Presence and functioning of weep system.

Minimum required face or edge clearances. Effective sealing between joints of glass framing members.

8.2 Do not proceed till unsatisfactory conditions noted during examination have all been corrected.

8.3 Preparation, unless otherwise specified or approved, must conform to applicable recommendations in the GANA Glazing Manual, GANA Sealant Manual, IGMA TB-3001, IGMA TM-3000, and manufacturer's recommendations. Determine the sizes to provide the required edge clearances by measuring the actual opening to receive the glass. Grind smooth in the shop glass edges that will be exposed in finish work. Leave labels in place until the installation is approved, except remove applied labels on insulating glass units as soon as glass is installed. Securely fix movable items or keep in a closed and locked position until glazing compound has thoroughly set.

8.4 Inspect glazing units to locate exterior and interior surfaces.

Temporarily label or mark units as needed so that exterior and interior surfaces are readily identifiable. Do not use materials that leave visible marks in the completed Work.

8.5 Clean glazing channels and other framing members receiving glass immediately before glazing. Remove coatings not specified as permanently bonded to substrates.

8.6 Ensure that glazing framing weep system must not be obstructed during installation of glazing. Coordinate installation with glazing frame manufacturer's instructions, and requirements.

9. GLASS SETTING

9.1 Shop glaze or field glaze items to be glazed using glass of the quality and thickness specified or indicated. Glazing, unless otherwise specified or approved, must conform to applicable recommendations in the GANA Glazing Manual, GANA Sealant Manual, IGMA TB-3001, IGMA TM-3000, and manufacturer's recommendations. Handle and install glazing materials in accordance with manufacturer's instructions. Use beads or stops which are furnished with items to be glazed to secure the glass in place. Verify products are properly installed, connected, and adjusted. Avoid contact of glass edges with framing members and do not rest the glass on any uncushioned surfaces. Avoid rotating glass on corners. Inspect glass prior to installation.

9.2 Comply with the manufacturer's warranty and written instructions.

Confirm that additional specified requirements are accepted by the manufacturer in writing.

9.3 Secure glass in place with bolts and spring clips. The minimum clearance between bolts and edge of glass unit must be 5 mm 3/16 inch. The glass must be edged, top and bottom, with 5 mm 3/16 inch thick continuous neoprene, vinyl, or other approved material. Trim edging after installation.

9.4 The channel shapes or strips must be firmly held against the glass by the spring action of the extruded metal moldings or metal bars.

Resilient setting blocks, spacer strips, clips, bolts, washers, angles, applicable glazing compound, and resilient channels or cemented-on materials must be as recommended in the written instructions of the glass manufacturer which must be submitted and approved prior to shipping the tower cab glass .

9.5 Prevent the transfer of stress in the setting frames to the glass.

Do not grind, nip or cut edges or corners of units after the units have left the factory. Springing, twisting, or forcing of units during setting is not permitted. Handle units so as not to strike frames or other objects. Installation must conform to applicable recommendations of IGMA TB-3001 and IGMA TM-3000.

9.6 Glass Corner and Edge Cushioning: Padding consisting of 50-70 shore durometer hardness material shall be placed in the glazing channel or on the glass edges/corners to avoid any glass to frame contact.

9.7 Gasket shall have a positive lock-in method so that gasket will not disengage from metal framing system during up and down and side-to-side movement.

9.8 Setting Blocks and Supports shall be permanently mounted to frame using a compatible sealant. Use anti-walk blocks.

10. CLEANING

10.1 Follow recommendations of GANA Glazing Manual and the glass manufacturer. Clean glass and metal frequently during construction. Clean glass surfaces and remove labels, paint spots, and other defacement as required to prevent staining. Glass must be cleaned with a soft, clean, grit-free cloth, mild soap, detergent, or slightly acidic cleaning solution.

Rinse immediately after cleaning with water and promptly remove excess rinse water with a clean squeegee. Razor blades or other sharp objects must not be used to clean glass surfaces. Glass must be clean at the time the work is accepted.

10.2 Clean glass at least one day prior to final inspection. Final inspection will be performed during the day and at night. Inspection at night is required verifying that the glass does not have optical distortions that causes ghosting/double images. No additional work will be performed in tower cab by the contractor after final inspection without permission of contracting officer.

11. PROTECTION

11.1 Glass work must be protected immediately after installation. Glazed openings must be identified with suitable warning tapes, cloth or paper flags, attached with non-staining adhesives. Protective material must be placed far enough away from the coated glass to allow air to circulate to reduce heat buildup and moisture accumulation on the glass. Glass units which are broken, chipped, cracked, abraded, or otherwise damaged during construction activities must be removed and replaced with new units.

11.2 Follow recommendations of GANA Glazing Manual and the glass manufacturer. Protect the glass from weld splatter by using plywood or heavy tarpaulins. Do not place insulation over the glass for protection or keep shading material on the glass because excess thermal buildup could result in glass breakage. Do not allow materials to be stored or placed in contact with the glass.

12. MAINTENANCE MANUALS

Provide product manufacturers published and written instructions for both the maintenance and cleaning of the tower cab glass assemblies as installed in the format compliant with the project requirements and as approved by the Contracting Officer.