ADS Cab Glass Replacement QA Response.pdf

ADS Cab Glass Replacement

697DCK-26-R-00251

Questions & Answers

May 06, 2026

1. Is there any specifications of the existing glass type? Response: Original cab glass specification attached “Original Installation 08800” for reference. As-Built Cab glass replacement drawing is attached for reference only “ADS-ATCT-A03-S1-C” and “ADS-ATCT-

A03-S2-B”.

2. Can you please let us know where the fogged up piece of glass is located on the tower.

Response: Cab Insulated Glass Units 2, 3, 4, and 10 are fogging.

3. Can we use the parking lots, on South side of Tower and North of Tower? we need space for crane and for Boom. One can be parked on street. Response: Crane will have to be out of the towers line-of-sight. North and South of the Tower would be in the line-of-sight. Unclear if you are asking about a boom lift, but all lifts cannot be in the line-of-sight.

4. Completion of this project depends on weather, for that reason, all heavy equipment has to stay parked somewhere near the property, will we be able to have a portion of any of parking lots for our equipment, till we complete the job, or, we'll leave parked on the street? Response:

See below area that can be used for contractor vehicle parking heavy equipment overnight parking. The other parking spots are needed by the facility for operations. Contractor must verify turning radius of heavy equipment.

5. During working hours, will a Controller representative with us, or will we be equipped with two way radio to communicate with AT Controllers? Response: Contractor will be in contact with the Resident Engineer.

6. The operating crane will need to be over the height of Tower, at least 20 ft above Tower roof, do we need to notify the FAA authority or it will be coordinated from your side, for the period we'll be working? Response: Contractor must file the FAA Obstruction Evaluation / Airport

Airspace Analysis (OE/AAA) per Specifications 01 00 00 and 01 10 00.

7. Will tint on side of existing cab glass need to be reinstalled? Response: If new cab glass warranty allow for 2” to 3” wide strips of tint to be installed, install 2” to 3” wide strip of tint on cab glass edge to overlap with the cab shades to match existing conditions. Tint to match existing.

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08800 GLAZING

PART 1.00 GENERAL

1.01 WORK INCLUDED:

Furnish labor, materials, equipment and incidentals necessary to install glass and glazing.

1.02 RELATED WORK COVERED ELSEWHERE:

Storefront Systems Section 08410 Framed Mirrors Section 10805 Guardrails Section 05520 Metal Doors and Frames Section 08110 Wood Doors Section 08210

1.03 QUALITY ASSURANCE:

A. FABRICATORS:

Fabricators of insulating units shall adhere to the certification program of SIGMA which includes random periodic testing according to ASTM E-773 and E-774, and tested units shall carry the highest passing grade. Provide units fabricated by General Glass Corporation, Denver, Co or approved equal:

B. DESIGN CRITERIA

1. Glass shall comply with the requirements of ASTM Standard E1300 "Standard

Specification for Determining the Minimum Thickness of Annealed Glass Required to Resist a Specific Load", based on straight line wind graphs as well as manufacturer's wind load charts and information obtainable from the local U.S.

Weather Bureau.

2. Contractor shall determine the wind loading of glass in its position within the structure and provide glazing suitable to the wind pressure at each level, as recommended by the manufacturer. Furnish design data for each glass type and location to Contracting Officer for approval prior to the fabrication of any glazing unit.

3. Maximum deflection of framing number shall be limited to 1/175 of span.

Contractor shall coordinate this requirement with supplies of aluminum framing members.

4. Fixed Glazing Systems, including aluminum framing systems, glazing units, joints and seals, shall meet or exceed the following:

Air infiltration (ASTM E 283) - 0.60 CFM/624 PSF of Pressure Water Penetration (ASTM E331) - none at 15 psf of pressure Uniform load structural per ASTM E330.

5. ATCT cab glazing, in addition to requirements above glass at cab shall be capable to resisting wind pressure caused by 90 mph winds minimum, or higher values as

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determined by local wind charts obtained from the local weather bureau. Glazed windows shall experience no appreciable leakage during wind driven rains in addition to 90 mph winds, determined during actual storm conditions.

1.04 SUBMITTALS:

A. Submittals shall be in accordance with Section 01300, SUBMITTALS and shall include product data sheets and specifications.

B. Two 12 X 12 inch samples of each kind and thickness of glass required.

1.05 REFERENCES AND STANDARDS:

The applicable provision of following references and standards are hereby made a part of this section as if written in their entirety:

A. FEDERAL SPECIFICATIONS (FED. SPEC.):

DD-G-451 "Glass, Float or Plate, Sheet, (Flat, for Glazing, Mirrors and Other Uses)."

DD-G-1403 "Glass, Float, Sheet, Figured, Coated (Heat Strengthened and Tempered)"

B. NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) STANDARDS:

No. 80 "Fire Doors and Windows"

C. FLAT GLASS MARKETING ASSOCIATION (FGMA) PUBLICATIONS:

"Glazing Manual"

D. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) PUBLICATIONS:

E-773 "Test Method for Seal Durability of Sealed

Insulating Glass Units"

E-774 "Specification for Sealed Insulating Glass"

E. SEALED INSULATING GLASS MANUFACTURERS ASSOCIATION (SIGMA):

"Bylaws"

F. AMERICAN NATIONAL STANDARD INSTITUTE (ANSI) PUBLICATIONS:

ANSI 297.1 "Safety Glazing Materials"

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G. CONSUMER PRODUCTS SAFETY COMMISSION'S STANDARDS:

STD6CFR1201 "Safety Glass"

1.06 DELIVERY HANDLING, AND STORAGE:

Deliver glass to the site in accordance with the construction schedule to avoid delays. Do not deliver before installation can begin. Erect glass in place as it is delivered to the site.

1.07 JOB CONDITIONS:

A. If there is a possibility that glazing will create a hazard during construction, provide adequate means of marking the location of erected glass.

B. Protect glass from damage after installation. Replace glass broken by workmen during construction and by vandalism until the project is accepted by the Government.

C. Safety glazing shall comply with 16CFR1201 "Safety Glass". Unless otherwise noted, safety glazing shall be tempered glass. Provide safety glazing at doors, 4'-0" either side of doors, for glass with a sill height of less than 18" inches above floor, and at ATCT walking guardrail.

D. Protect ATCT cab glazing from welds and impacts.

PART 2.00 PRODUCTS

2.01 MATERIALS:

A. TEMPERED GLASS:

Clear tempered glass meeting requirements of ASTM C-1036, Fed. Spec. DD-C-1403b and ASTM C-1048. Tempered glass shall conform to ANSI 297.1 and Consumer Products Commission 16CFR-1201.

B. LAMINATED INSULATING GLASS:

Outer 1/4 inch pane laminated to 1/4 inch clear pane with a layer of .060 inch clear butylal;

1/2 inch air space and 1/4 inch clear inner pane make up the total 1 5/16 inch thickness of laminated insulating glass. The lamination shall be per the requirements of ASTM C-1036, ANSI-297.1 and CFR-1201. Glass shall also meet industry guidelines issued by the Laminators Safety Glass Association (LSGA). Use in Fixed aluminum windows of Base Building and ATCT shaft windows.

C. GLAZING TAPE:

Butyl glazing tape; fully cured; 3M "606 Butyl Tape", or approved equal.

D. SETTING BLOCKS:

Neoprene, 70-90 Shore A durometric hardness.

E. SPACERS:

Neoprene, 40-50, Shore A durometric hardness.

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F. SEALANT:

One part acrylic terpolymer in selected standard color. The Tremco Manufacturing Co.;

"Mono-Lasto-Meric" or equal.

G. CLEAR SEALANT:

One part translucent silicone rubber compound; Dow Corning Corp.; "Silicone Rubber

Sealant"; or approved equal.

H. SPANDREL GLASS:

Provide 1/4 inch thick heat strengthened opaque ceramic frit spandrel glass, laminated to urethane foam insulation, and laminated to 1/8 inch hardboard with stucco aluminum interior finish. Color coating and glass color shall match vision lites. PPG Industries “Spandrelite” or approved equal.

2.02 FABRICATIONS:

Mirrors shall be 1/4" inch thick, quality polished plate glass, silver-coated with a copper backing consisting of a film of copper electrolytically deposited over the silvered surface. Mirrors shall be installed with concealed fasteners in the sizes required.

2.03 INSULATING GLAZING UNITS:

A. Exterior windows shall be glazed with thermal double pane glazing units, consisting of an outer pane of bronze laminated glass and an inner pane of clear tempered glass. The two

(2) panes shall be separated by an aluminum spacer fused to a gas-tight condition and containing desiccants. Dual seal construction shall have a primary seal of compressed polyisobutylene and a secondary seal of two (2) component silicone. Units shall be certified by the Insulating Glass Certification Council (IGCC) in accordance with ASTM E-773 and ASTM E-774. Units shall adhere to the certification program of SIGMA.

B. Glazing units shall meet the following requirements:

Type "I" Exterior glass thickness 9/16" inch, bronze tinted Interior glass thickness 1/4" inch, clear Total overall thickness 1 5/16" inch Shading Coefficient .58 min Summer Daytime U valve .57 BTU/Hr.x Ft.2 x deg. F min Winter nighttime U valve .49 BTU/Hr.x Ft.2 min Total Visible Transmittance 47 percent min Solar reflections 7 percent min

Outer panes shall be laminated glass. Inner panes shall be tempered glass.

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Type "II"

Special glass unit for ATCT Cabs. Glass shall be highest quality clear 1/2 inch thick float glass provided by a single source from the same lot and shall bear the mark of the manufacturers. Edges shall be factory cut and ground smooth. Insulating glass units for the ATCT Cab shall be hermetically sealed units with the two lights of glass separated by a dehydrated air space. The metal separator shall be dark bronze color. Units shall be double sealed: primary seal shall be polyisoulylene; secondary seal shall be polyurethane or silicone. Within the bottom of 1/3 of one of the vertical edges of the units, the fabricator shall install an open 12-inch-long capillary/breather tube for pressure equalization. The tube shall be open during installation and capped after installation is complete. Glass glazing unit shall meet the following requirements:

Outer Pane 1/2" thick, clear Inner Pane 1/2" thick, clear Total Overall Thickness 1 1/2" thickness Visible Transmittance 65 percent

PART 3.00 EXECUTION

3.01 PREPARATION:

A. Frames receiving glazing shall be clean, free of oil, grease, dust or other materials. Firmly anchor in place before installing glass.

B. Verify opening sizes at the job site before cutting any glass. Cut glass accurately to fit field measurements. Framing members shall be plumb and vertical, installed without bows or misalignment. Frames shall not be set to be under stress from surrounding construction.

3.02 INSTALLATION, GENERAL:

A. Cut each pane to proper size, allowing a face clearance of 1/8" inch and an edge clearance of 1/4" inch between the glass and the framing members at all perimeters. Avoid contact of glass to metal. Cut glass to produce clean, smooth edges, free of piped or chipped edges.

B. Provide setting blocks at quarter points of glass bearing. Center glass in opening in both horizontal and vertical planes. Provide edge blocks for large panes, which are no less than three (3") inches long and insert near the top and bottom edges of vertical members.

C. Glazing in metal frames with stops shall be made with tape glazing. Cut glazing tape to the full length of the opening and set against permanent stops. Remove protective paper from tape, set glass onto setting blocks and press firmly against tape surface. Seal joints between glazing stop and glass with continuous bead of sealant.

D. Frames furnished with neoprene or vinyl glazing strips shall have glass set in accordance with the manufacturer's recommendations to produce a weather-tight joint.

E. At removable stops, provide a 1/4 inch clearance between edge of glazing material and back of glazing rabbet at jambs and head after allowance for setting block or shim thickness at sill. At dry glazing, provide clearance required by design of frame member but not less than 1/4 inch.

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3.03 INSTALLATION OF GLAZING MATERIAL:

A. CAB GLASS:

Install with breather tube open. Position the end of the tube so that the end of the tube is visible and accessible when the exterior glazing bead cover is removed. Use caution while positioning the tube not to break the seal of the tube at point of penetration of the insulation glass unit. Before installing the glazing bead cover, seal the end of the tube with polyurethane sealant in a manner that the seal can be easily broken. Provide a weatherproof decal adhered to the bead cover as indication of the location of the breather tube. This special requirement is to permit periodic future air pressure equalizing.

B. EXTERIOR THERMAL DOUBLE PANED GLAZING UNITS:

Set units on two (2) neoprene setting blocks which are placed at quarter points. Setting blocks shall be at least six (6") inches longer and 1/8" inch wider than the glass unit. Center glazing unit in opening and install Shore A 50 to 60 neoprene edge blocks, three (3") inches long at each edge. Install silicone sealant to completely seal glass unit.

C. GLAZING PANELS:

Install glazing panels in aluminum frames using the frame manufacturer's neoprene glazing gaskets. Provide flexible setting blocks on the bottom edge, and provide an expansion space per panel manufacturer’s recommendation on each side and top.

3.04 FIELD QUALITY CONTROL:

A. Replace glass and materials that become broken, chipped, cracked or damaged during construction and before substantial completion of building.

B. Where existing work is required to be reglazed, remove existing setting material completely to base glazing frame and reglaze opening as required for a new glazing.

C. Surface scratches shall be cause for rejection of any piece of glass. Iron spots, weld marks, or any defects that confuse vision from Cab shall be defects that require replacement of glass.

3.05 CLEANING:

After painting has been completed, clean and polish glass surfaces, and also any setting moldings and adjoining surfaces which become soiled as a result of glazing operation. Leave job in first class condition.

3.06 SCHEDULES:

Install insulating glazing units as follows:

TYPE I: Glazing for Base Building and ATCT shaft windows.

TYPE II: ATCT Cab only.

END OF SECTION