SCO-25-29127-01A-NTB Add #3.pdf

ADDENDUM #3

May 15, 2026

SCO ID# 25-29127-01A

NCDOT – Gaston County Equipment Sub-Shop

The following Addendum clarifies, revises, and takes precedence over information previously published.

CLARIFICATIONS:

1. The Equipment Schedule on sheet P002 indicates the air compressor is furnished by the owner but Detail 1 on sheet P502 indicates the air compressor and dryer are furnished by the plumbing contractor. If we are responsible for these items, please provide the required specifications.

RESPONSE: The Owner is to provide the air compressor and dryer to be installed by General Contractor. Installed CA piping as indicated on Contract

Documents.

2. The plumbing sheets offer no information on the wash bay pit. I went to the architectural sheets looking for the depth so I could determine how deep the oil interceptor will be.

RESPONSE: Refer to structural drawings for cast in place concrete pit information. Depth of pit to be -2’-8” – refer to S101.

3. If we are to furnish the wash bay pit, we need a specification. We also need the depth on the pit to determine the burial depth/costs for the oil interceptor.

RESPONSE: Refer to structural drawings for cast in place concrete pit information. Depth of pit to be -2’-8” – refer to S101.

4. Who is responsible for installing the fluid drums and the piping between the air reels and fluid drum operators?

RESPONSE: The Owner is to provide the fluid drums and piping between the air reels and fluid drum operators.

5. Page L-100 has note “See sheet C-001 for planting plan notes”, but no notes exist.

RESPONSE: Note indicating “See sheet C-001 for planting plan notes” on L-100 to be removed. Excluding seeding as indicated on L-100, no planting is required on the project.

NCDOT Gaston County Equipment Sub-Shop

Addendum #3

5/15/2026

6. We would like to confirm that the roof panels are to be 22 gauge. The standard is 24 gauge.

RESPONSE: Roof panels are to be 22 gauge as indicated on the Contract

Documents.

7. We want to confirm that 24 gauge wall panels with concealed fasters is necessary.

They add a considerable cost.

RESPONSE: Provide 24 gauge wall panels with concealed fasteners are indicated on the Contract Documents.

8. Will there be water and electricity available, or do we need to make our own accommodations?

RESPONSE: Temporary power and water to be provided by General Contractor.

9. In the areas of heavy duty asphalt by owner, do we need to install and set up the stone under it, or is that also by owner?

RESPONSE: The General Contractor shall provide and prepare the required stone base/subgrade. Heavy-duty asphalt paving shall be provided by the

Owner.

10. Is there a spec available for RCB-2 called out on page A1400?

RESPONSE: No base in required in the Wash Bay alternate. Remove designation of RCB-2 in 112 Wash Bay as indicated on the Contract Documents in the Finish Schedule on sheet A1400 Finish Plans.

11. Looking for clarification on air compressor and related air reels and equipment.

The plumbing specs say the owner furnishes the air compressor, the plumbing drawing P-502 says air compressor and dryer are by PC. There are no specs on any air equipment in our data.

RESPONSE: Owner to provide compressor and dryer. GC to provide CA piping as indicated on the bid drawings.

12. Are the 8 OH doors are to be insulated? Nothing in specs mentioning insulation.

RESPONSE: Provide insulated overhead doors at all locations. Update to specification to be forthcoming.

SUBSTITUTION REQUESTS:

1. Alliance Steel Building Systems (Alliance SBS) is APPROVED as an acceptable manufacturer for Section 133419 – Metal Building Systems. Approval is contingent upon full compliance with the Contract Documents, including all

NCDOT Gaston County Equipment Sub-Shop

Addendum #3

5/15/2026 performance, warranty, delegated design, and specification requirements. Final determination of compliance will be made during the shop drawing, product data, and submittal review process by the Architect and design team. This approval is for bidding purposes only and shall not be construed as blanket approval of all products, systems, substitutions, or deviations from the Contract Documents.

2. Kirby Building Systems is APPROVED as an acceptable manufacturer for Section 133419 – Metal Building Systems. Approval is contingent upon full compliance with the Contract Documents, including all performance, warranty, delegated design, and specification requirements. Final determination of compliance will be made during the shop drawing, product data, and submittal review process by the Architect and design team. This approval is for bidding purposes only and shall not be construed as blanket approval of all products, systems, substitutions, or deviations from the Contract Documents

3. GMB Steel / Elite Structures is REJECTED as an acceptable manufacturer for Section 133419 – Metal Building Systems based on the information submitted.

The substitution request does not provide sufficient documentation to demonstrate compliance with the Contract Documents, including but not limited to IAS AC472 accreditation requirements, product-specific system information, performance testing data, delegated design criteria, and warranty compliance documentation. Manufacturer may be reconsidered upon submission of complete supporting documentation demonstrating full compliance with the specification requirements.

SPECIFICATONS

1. Specification 083323 – Overhead Coiling Doors

a. Replace Specification 083323 – Overhead Coiling Doors in its entirety – modification of specification includes the revision of insulating slats in each overhead coiling door.

ATTACHMENTS:

The following have been attached and included.

1. Specification 083323 – Overhead Coiling Doors

END OF ADDENDUM #3

Morris-Berg Architects North Carolina Department of Transportation

Addendum #3 Gaston County Equipment Sub-Shop 2501

Construction Document Submittal

July 18, 2025

SCO #25-29127-02

OVERHEAD COILING DOORS 083323 - 1

SECTION 083323 - OVERHEAD COILING DOORS

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Insulated service doors.

B. Related Requirements”

1. 1. Division 26 – Electrical wiring and conduit, fuses, disconnect switches, connection of operator to power supply, and installation of control station and wiring.

1.2 ACTION SUBMITTALS

A. Product Data: For each type and size of overhead coiling door and accessory.

1. Include construction details, material descriptions, dimensions of individual components, profiles for slats, and finishes.

2. Include rated capacities, operating characteristics, electrical characteristics, and furnished accessories.

B. Shop Drawings: For each installation and for special components not dimensioned or detailed in manufacturer's product data.

1. Include plans, elevations, sections, and mounting details.

2. Include details of equipment assemblies, and indicate dimensions, required clearances, method of field assembly, components, and location and size of each field connection.

3. Include points of attachment and their corresponding static and dynamic loads imposed on structure.

4. For exterior components, include details of provisions for assembly expansion and contraction and for excluding and draining moisture to the exterior.

5. Include diagrams for power, signal, and control wiring.

C. Samples for Initial Selection: Manufacturer's finish charts showing full range of colors and textures available for units with factory-applied finishes.

1. Include similar Samples of accessories involving color selection.

D. Samples for Verification: For each type of exposed finish on the following components, in manufacturer's standard sizes:

1. Curtain slats.

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 2

1.3 INFORMATIONAL SUBMITTALS

A. Qualification Data: For Installer.

1.4 CLOSEOUT SUBMITTALS

A. Special warranty.

B. Maintenance Data: For overhead coiling doors to include in maintenance manuals.

1.5 QUALITY ASSURANCE

A. Installer Qualifications: An entity that employs installers and supervisors who are trained and approved by manufacturer for both installation and maintenance of units required for this

Project.

1. Maintenance Proximity: Not more than two hours' normal travel time from Installer's place of business to Project site.

1.6 WARRANTY

A. Special Warranty: Manufacturer agrees to repair or replace components of doors that fail in materials or workmanship within specified warranty period.

1. Warranty Period: Five years from date of Final Inspection.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Source Limitations: Obtain overhead coiling doors from single source from single manufacturer.

1. Obtain operators and controls from overhead coiling-door manufacturer.

2.2 PERFORMANCE REQUIREMENTS

A. Accessibility Standard: Comply with applicable provisions in the USDOJ's "2010 ADA

Standards for Accessible Design” and the latest edition of ICC A117.1.

B. Structural Performance, Exterior Doors: Capable of withstanding the following design wind loads:

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 3

1. Design Wind Load: As indicated on Drawings.

2. Operability under Wind Load: Design overhead coiling doors to remain operable under uniform pressure (velocity pressure) of 20-lbf/sq. ft. wind load, acting inward and outward.

3. Component Importance Factor: 1.0.

2.3 DOOR ASSEMBLY OH

A. Service Door: Overhead coiling door formed with curtain of interlocking metal slats.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

a. Cookson; a CornellCookson company.

b. Cornell; a CornellCookson company.

c. McKeon Door Company.

d. Overhead Door Corporation.

e. Raynor Garage Doors.

B. Operation Cycles: Door components and operators capable of operating for not less than

100,000. One operation cycle is complete when a door is opened from the closed position to the fully open position and returned to the closed position.

C. Air Infiltration: Maximum rate of less than 0.3 cfm/sq. ft. 15 and 25 mph when tested according to ASTM E283.

D. STC Rating: 26.

E. Insulated Door Curtain R-Value: 4.5 deg F x h x sq. ft./Btu.

F. Insulated Door Assembly U-Factor: 0.90 Btu/deg F x h x sq. ft.

G. Door Curtain Material: Galvanized steel.

H. Door Curtain Slats: Flat profile slats of 3-inch center-to-center height.

1. Insulated-Slat Interior Facing: Metal.

2. Vision Windows/Lites: Manufacturer’s standard vision widows/lites every other slat from a height of 6’-0” above finished floor to 8’-0” above finish floor, full allowable width of door.

3. Gasket Seal. Manufacturer's standard continuous gaskets between slats.

I. Bottom Bar: Two angles, each not less than 1-1/2 by 1-1/2 by 1/8 inch thick fabricated from hot-dip galvanized steel and finished to match curtain slats.

http://www.specagent.com/Lookup?ulid=7627 http://www.specagent.com/Lookup?uid=123457222194 http://www.specagent.com/Lookup?uid=123457222195 http://www.specagent.com/Lookup?uid=123457222197 http://www.specagent.com/Lookup?uid=123457222199 http://www.specagent.com/Lookup?uid=123457222201

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 4

J. Curtain Jamb Guides: 12 gauge Galvanized steel with exposed finish matching curtain slats.

K. Hood: 24 gauge Galvanized steel with finish matching curtain slats.

1. Shape: Round.

2. Mounting: Between jambs – GC to coordinate with PEMB supplier.

L. Locking Devices: Provide internal slide bolt with padlock provision on the bottom bar for

Owner use. Locking device shall be compatible with motor operator and not interfere with normal operation. Coordinate with operator to ensure door cannot be damaged if opened while padlocked.

1. Locking Device Assembly: Single-jamb side locking bars, operable from inside with thumbturn, provide provision for padlock.

M. Electric Door Operator:

1. Usage Classification: Medium duty, up to 12 cycles per hour and up to 50 cycles per day.

2. Operator Location: As indicated on Drawings.

3. Safety: Listed according to UL 325 by a qualified testing agency for commercial or industrial use; moving parts of operator enclosed or guarded if exposed and mounted at 8 ft..

4. Motor Exposure: Interior.

5. Motor Electrical Characteristics:

a. Horsepower: 1 hp.

b. Voltage: 208 V ac, three phase, 60 Hz.

6. Emergency Manual Operation: Chain type.

7. Obstruction-Detection Device: Automatic photoelectric sensor and electric sensor edge on bottom bar; self-monitoring type.

a. Sensor Edge Bulb Color: Black.

8. Control Station(s): Interior mounted.

N. Curtain Accessories: Equip door with weatherseals, astragal and pull-down strap.

O. Door Finish:

1. Baked-Enamel or Powder-Coated Finish: Color as selected by Architect from manufacturer's full range.

2.4 MATERIALS, GENERAL

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 5

2.5 DOOR CURTAIN MATERIALS AND CONSTRUCTION

A. Door Curtains: Fabricate overhead coiling-door curtain of interlocking metal slats, designed to withstand wind loading indicated, in a continuous length for width of door without splices.

Unless otherwise indicated, provide slats of thickness and mechanical properties recommended by door manufacturer for performance, size, and type of door indicated, and as follows:

B. Curtain Jamb Guides: Manufacturer's standard angles or channels and angles of same material and finish as curtain slats unless otherwise indicated, with sufficient depth and strength to retain curtain, to allow curtain to operate smoothly, and to withstand loading. Slot bolt holes for guide adjustment. Provide removable stops on guides to prevent overtravel of curtain.

2.6 HOODS

A. General: Form sheet metal hood to entirely enclose coiled curtain and operating mechanism at opening head. Contour to fit end brackets to which hood is attached. Roll and reinforce top and bottom edges for stiffness. Form closed ends for surface-mounted hoods and fascia for any portion of between-jamb mounting that projects beyond wall face. Equip hood with intermediate support brackets as required to prevent sagging.

1. Galvanized Steel: Nominal 0.028-inch- thick, hot-dip galvanized-steel sheet with G90 zinc coating, complying with ASTM A653/A653M.

2.7 LOCKING DEVICES

A. Slide Bolt: Fabricate with side-locking bolts to engage through slots in tracks for locking by padlock, located on both left and right jamb sides, operable from coil side.

1. Lock Cylinders: As specified in Section 087100 "Door Hardware" and keyed to building keying system.

2. Keys: Two for each cylinder.

B. Chain Lock Keeper: Suitable for padlock.

C. Safety Interlock Switch: Equip power-operated doors with safety interlock switch to disengage power supply when door is locked.

2.8 CURTAIN ACCESSORIES

A. Weatherseals for Exterior Doors: Equip each exterior door with weather-stripping gaskets fitted to entire exterior perimeter of door for a weather-resistant installation unless otherwise indicated.

1. At door head, use 1/8-inch- thick, replaceable, continuous-sheet baffle secured to inside of hood or field-installed on the header.

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 6

2. At door jambs, use replaceable, adjustable, continuous, 1/8-inch-thick seals of flexible nylon brushes.

3. At door bottom, provide a resilient, replaceable astragal factory-installed on the bottom bar to minimize air infiltration, debris and pest intrusion.

2.9 COUNTERBALANCE MECHANISM

A. General: Counterbalance doors by means of manufacturer's standard mechanism with an adjustable-tension, steel helical torsion spring mounted around a steel shaft and contained in a spring barrel connected to top of curtain with barrel rings. Use grease-sealed bearings or self-lubricating graphite bearings for rotating members.

B. Counterbalance Barrel: Fabricate spring barrel of manufacturer's standard hot-formed, structural-quality, seamless carbon-steel pipe, of sufficient diameter and wall thickness to support rolled-up curtain without distortion of slats and to limit barrel deflection to not more than 0.03 in./ft. of span under full load.

C. Counterbalance Spring: One or more oil-tempered, heat-treated steel helical torsion springs.

Size springs to counterbalance weight of curtain, with uniform adjustment accessible from outside barrel. Secure ends of springs to barrel and shaft with cast-steel barrel plugs.

1. Fire-Rated Doors: Equip with auxiliary counterbalance spring and prevent tension release from main counterbalance spring when automatic-closing device operates.

D. Torsion Rod for Counterbalance Shaft: Fabricate of manufacturer's standard cold-rolled steel, sized to hold fixed spring ends and carry torsional load.

E. Brackets: Manufacturer's standard mounting brackets of either cast iron or cold-rolled steel plate.

2.10 ELECTRIC DOOR OPERATORS

A. General: Electric door operator assembly of size and capacity recommended and provided by door manufacturer for door and operation-cycles requirement specified, with electric motor and factory-prewired motor controls, starter, gear-reduction unit, solenoid-operated brake, clutch, control stations, control devices, integral gearing for locking door, and accessories required for proper operation.

1. Comply with NFPA 70.

2. Control equipment complying with NEMA ICS 1, NEMA ICS 2, and NEMA ICS 6, with

NFPA 70 Class 2 control circuit, maximum 24-V ac or dc.

B. Usage Classification: Electric operator and components capable of operating for not less than number of cycles per hour indicated for each door.

C. Door Operator Location(s): Operator location indicated for each door.

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 7

1. Wall Mounted: coil side of the door, located to the left/right of the opening as indicated on Drawings. Mount above shaft where headroom allows. Coordinate side clearance and structural support with door and operator manufacturer.

D. Motors: Reversible-type motor with controller (disconnect switch) for motor exposure indicated for each door assembly.

1. Electrical Characteristics: Minimum as indicated for each door assembly. If not indicated, large enough to start, accelerate, and operate door in either direction from any position, at a speed not less than 8 in./sec. and not more than 12 in./sec., without exceeding nameplate ratings or service factor.

2. Operating Controls, Controllers, Disconnect Switches, Wiring Devices, and Wiring:

Manufacturer's standard unless otherwise indicated.

3. Coordinate wiring requirements and electrical characteristics of motors and other electrical devices with building electrical system and each location where installed.

E. Limit Switches: Equip each motorized door with adjustable switches interlocked with motor controls and set to automatically stop door at fully opened and fully closed positions.

F. Obstruction-Detection Devices: External entrapment protection consisting of indicated automatic safety sensor capable of protecting full width of door opening. For non-fire-rated doors, activation of device immediately stops and reverses downward door travel.

1. Photoelectric Sensor: Manufacturer's standard system designed to detect an obstruction in door opening without contact between door and obstruction.

a. Self-Monitoring Type: Designed to interface with door operator control circuit to detect damage to or disconnection of sensing device. When self-monitoring feature is activated, door closes only with sustained or constant pressure on close button.

2. Electric Sensor Edge: Automatic safety sensor edge, located within astragal or weather stripping mounted to bottom bar. Contact with sensor activates device. Connect to control circuit using manufacturer's standard take-up reel or self-coiling cable.

a. Self-Monitoring Type: Four-wire-configured device designed to interface with door operator control circuit to detect damage to or disconnection of sensor edge.

G. Control Station: Three-button control station in fixed location with momentary-contact push-button controls labeled "Open" and "Stop" and sustained- or constant-pressure push-button control labeled "Close."

1. Interior-Mounted Units: Full-guarded, surface-mounted, heavy-duty type, with general-purpose NEMA ICS 6, Type 1 enclosure.

H. Emergency Manual Operation: Equip each electrically powered door with capability for emergency manual operation. Design manual mechanism so required force for door operation does not exceed 30 lbf.

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 8

I. Emergency Operation Disconnect Device: Equip operator with hand-operated disconnect mechanism for automatically engaging manual operator and releasing brake for emergency manual operation while disconnecting motor without affecting timing of limit switch. Mount mechanism so it is accessible from floor level. Include interlock device to automatically prevent motor from operating when emergency operator is engaged.

J. Motor Removal: Design operator so motor may be removed without disturbing limit-switch adjustment and without affecting emergency manual operation.

2.11 GENERAL FINISH REQUIREMENTS

A. Comply with NAAMM/NOMMA 500 for recommendations for applying and designating finishes.

B. Appearance of Finished Work: Noticeable variations in same piece are not acceptable.

Variations in appearance of adjoining components are acceptable if they are within the range of approved Samples and are assembled or installed to minimize contrast.

2.12 ALUMINUM FINISHES

A. Baked-Enamel or Powder-Coat Finish: AAMA 2603. Comply with coating manufacturer's written instructions for cleaning, conversion coating, and applying and baking finish.

2.13 STEEL AND GALVANIZED-STEEL FINISHES

A. Baked-Enamel or Powder-Coat Finish: Manufacturer's standard baked-on finish consisting of prime coat and thermosetting topcoat. Comply with coating manufacturer's written instructions for cleaning, pretreatment, application, and minimum dry film thickness.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates areas and conditions, with Installer present, for compliance with requirements for substrate construction and other conditions affecting performance of the Work.

B. Examine locations of electrical connections.

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

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 9

3.2 INSTALLATION, GENERAL

A. Install overhead coiling doors and operating equipment complete with necessary hardware, anchors, inserts, hangers, and equipment supports; according to manufacturer's written instructions and as specified.

B. Install overhead coiling doors, hoods, controls, and operators at the mounting locations indicated for each door.

C. Accessibility: Install overhead coiling doors, switches, and controls along accessible routes in compliance with the accessibility standard.

D. Power-Operated Doors: Install according to UL 325.

3.3 FIELD QUALITY CONTROL

A. Testing Agency: Engage a qualified testing agency to perform tests and inspections and to furnish reports to Architect.

B. Perform the following tests and inspections with the assistance of a factory-authorized service representative:

1. Test door release, closing, and alarm operations when activated by smoke detector or building's fire-alarm system. Test manual operation of closed door. Reset door-closing mechanism after successful test.

2. Fire-Rated Door Inspections: Inspect each fire-rated door in accordance with NFPA 80, Section 5.2.

C. Repair or remove and replace installations where inspections indicate that they do not comply with specified requirements.

D. Reinspect repaired or replaced installations to determine if replaced or repaired door assembly installations comply with specified requirements.

3.4 STARTUP SERVICE

A. Engage a factory-authorized service representative to perform startup service.

1. Complete installation and startup checks according to manufacturer's written instructions.

2. After electrical circuitry has been energized, operate doors to confirm proper motor rotation and door performance.

3. Test and adjust controls and safety devices. Replace damaged and malfunctioning controls and equipment.

Construction Document Submittal

OVERHEAD COILING DOORS 083323 - 10

3.5 ADJUSTING

A. Adjust hardware and moving parts to function smoothly so that doors operate easily, free of warp, twist, or distortion.

1. Adjust exterior doors and components to be weather resistant.

B. Lubricate bearings and sliding parts as recommended by manufacturer.

C. Adjust seals to provide tight fit around entire perimeter.

3.6 MAINTENANCE SERVICE

A. Initial Maintenance Service: Beginning at Substantial Completion, maintenance service includes

12 months' full maintenance by skilled employees of coiling-door Installer. Include quarterly preventive maintenance, repair or replacement of worn or defective components, lubrication, cleaning, and adjusting as required for proper door operation. Parts and supplies are to be manufacturer's authorized replacement parts and supplies.

1. Include 24-hour-per-day, seven-day-per-week, emergency callback service.

3.7 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain overhead coiling doors.

END OF SECTION 083323