Manufacturer of 
Quality Rolling Steel Doors


IMB-V5 - Insulated Dock Doors

Insulated Roller Shutter

Product Features

  • Insulated doors with metal backing
  • Increased thermal protection, fully weatherstripped
  • This dock door has an R-Value of 6.82
  • 5/8″ thick polystyrene slats

Alpine’s Insulated IMB-V5 dock doors are used for warehouses, loading docks, parking garages, aircraft hangars, fire houses, truck terminals, police stations, correctional facilities, manufacturing and retail applications among others. Our insulated roller shutters are built to last. 

Functional Benefits

  • 2.5/8” insulated flat 5/8” thick slats available in various front/back slat gauge combinations. 
  • Foamed in place CFC and HCFC free polyurethane insulation bonds to the metal skin and strengthens the slats.
  • Dock doors can be manual hand crank, hand chain or motor operated. All operators can be adapted to specific conditions. 
  • Galvanized with powder coating as an optional finish.
  • Provides protection against water penetration and other inclement weather conditions.
  • Can be installed on the interior, exterior, face of wall or between jambs.

The Alpine Advantage and Benefit

  1. Alpine IMB-V5 Insulated Metal Backed Doors are designed for energy efficiency, easy operation and are trouble free with minimal maintenance required.  
  2. After 42 years in business, Alpine doors have been proven reliable for use on thousands of installations in Commercial and Business locations.  Alpine’s quality and workmanship is well known throughout the door industry. Our hands-on approach to every job ensures customer satisfaction.
  3. Made-to-Order manufacturing process. Alpine builds your product to the exact size, specifications and requirements.
  4. All of our products are constructed to have a rigid and compact design which provides for a more structural grade product while reducing overhead space and obstruction.
  5. Alpine builds trust by providing our products with a one-year warranty on material and workmanship. As we also offer an optional five-year prorated warranty.
  6. We are an ISO 9001:2015 registered firm which ensures that our products are built with strict quality control you can count on.


  • Rolling service doors as manufactured by Alpine Overhead Doors, Inc. are durable, sturdy and economical to install and maintain
  • Opening preparation, miscellaneous or structural metal work, access doors, finish or field painting, field electrical wiring, wire, conduit, fuses and disconnect switches are in the scope of work of other divisions or trades

Constructed of Interlocking, roll-formed 2 5/8” insulated galvanized 5/8” thick flat slats with foamed in place CFC and HCFC free polyurethane insulation, Structural Quality Grade D per ASTM-A653/A653-M as standard.
Finish Options: Exo-Shield™ powder coating system to include base coat consistent with ASTM A 653
> Click here for available Powder Coating colors.


Ductile Cast iron, hot-dipped galvanized endlocks/windlocks are riveted to the ends of the slats with 1/4” rivets. Option in brass material which prevents sparking. Furnish windlocks based on wind load specifications. 

Two galvanized roll-formed steel or structural steel angles which are designed to reinforce the bottom of the curtain. Equipped with rubber astragal or a sensing edge which extends into the guides. Galvanized steel as per ASTM-A653/A653-M.
OPTION: Exo-Shield™ Powder coating to match curtain. 

Alpine’s Grey ExoShield™ Powder Coat Carbon Steel plate not less than 1/4” thick with ball bearings at rotating support points on both brackets.  When bolted to the wall, the mounting angle that supports the barrel/pipe assembly and forms an end enclosure. OPTION: Stop lock bearing which prevents the door from free falling in the event of a drive operation failure.

Alpine’s ExoShield™ Powder Coated Guide system is designed using structural steel angles with a minimum thickness of 3/16” meeting the ASTM A36 Standard that are bolted together with ⅜” fasteners in 1-¼” slotted connections bolted at a minimum 24” on center. One inch spacing of the guide channel ensures smooth operation. Vinyl clip on guide weather seal is standard for the exterior with the option of adding seals on the interior 

Pipe shall be manufactured with a diameter and wall thickness to restrict maximum deflection to 0.03” per foot of door width.  Springs are helical torsion type which are designed to include an overload factor of 25% for optimum ease of operation., The springs are grease packed and mounted on a cold rolled steel inner shaft. Spring tension is adjustable from the outside of the end bracket. Sealed ball bearings as described above are designed to prevent wear on the shaft at each end of the pipe/barrel.

Life Cycle: 20,000 up to 400,000  

HOOD Hexagon (Option: Square or Round)
Made from #22-gauge galvanized steel as standard and formed to fit the contour of the end brackets.  Optional material in stainless steel or aluminum. Equipped with a neoprene air baffle.  Finish Options: #4 stainless steel or ExoShield powder coated to match curtain

Option 1: Slide bolt locks on the bottom bar.
Option 2: Motor acts as lock 
Option 3: Cylinder locks. (Electric interlocks are recommended for motorized doors to prevent damage

Applied to the guides, brackets and gears in addition to Standard Specifications. Applied where conditions of extreme or unusual atmospheric contamination is present. As per ASTM-A123

(Pipe Shafts available with Zinc Enriched Powder Coating or Stainless-Steel)

Useful where the area behind the hood is open, as seen in a between jambs type mounting configuration or other condition that exposes the opposite of coil side. Especially applicable with pre-engineered buildings. Finish is to match curtain.

Insulated roller shutters can be manual push up, hand crank, hand chain or motor operated. All operators can be adapted to specific conditions. 

Alpine Motor Operators

Alpine’s Redi-Master is a heavy industrial-duty, gear reduce hoist operator. Its features include a reduction unit comprised of a heavy-duty worme in an oil bath unit. The standard horsepower of the Redi-Master steel door operator is 1/2 and has a maximum horsepower. The Redi-Master includes a hand chain, a maintenance alert system, and a maximum run timer that automatically stops the door if it moves longer than its preset cycle time.
> View Redi-Master Details
Alpine’s Redi-Lift is an industrial-duty, V-belt hoist operator that is available for doors up to 12′ by 12′. The Redi-Lift includes a hand chain, a maintenance alert system, and a maximum run timer that automatically stops the door if it moves longer than its preset cycle time. This electric gate operator is available up to 1 horsepower.
> View Redi-Lift Details

NEMA 1 Open/Close/Stop push button station, Key Switches, NEMA 4 Open/Close/Stop push button station for exterior use. Please see Alpine’s Motor Operator Page

Photo Safety Sensors mounted to the guides 6” above the finished floor directing a beam across the opening which will stop the door and reverse to the fully open position if broken while door is cycling to close.
Option: Redi-Reverse Light Curtain consists of a 6’0” high light curtain integral to the guides, left and right. If an object passes through the light curtain during the close cycle, the door will reverse to the open cycle and come to rest upon reaching the open limit.
Option: NEMA 4X (weather resistant) photo safety sensors mounted to the guides 6” above the finished floor that project an infrared beam across the width of the door. Breaking the beam while the door is in motion will result in the immediate stop of downward travel and reverse the door to reopen to the top limit.
Option: Electric Monitored Sensing edge with a coil cord or take up reel, or a wireless monitored transmitter and receiver type monitored sensing edge.

Please see or entire list of options for a rolling door device. These insulated door operators are designed and manufactured to meet or exceed industry standards and are constructed with the highest quality material. Alpine’s team of employees work diligently with the customers to provide a thermal motor door and quality rolling door device that meets your individual specifications. Alpine shows their customers that their satisfaction is top priority. Call Alpine today to learn more about the thermal door motor operators that are available.

To download insulated roller shutters PDF drawings please select from links below.

> For CAD files, please click here

Alpine® IMB-V5® Dock Doors

Vibration Resistant Insulation

Model IMB V5®
Insulated Slats
Insulated Roller Shutters

NOTE: For insulated roller shutter specifications, architects must choose from a variety of options. The standard choice will be shown first in plain text followed by the options shown in [brackets] (Example “Finish: Galvanized [Powder coated] [Baked enamel]”). The specifier must make the appropriate choices for the thermal doors and delete the others (Example: “Finish: Powder coated”).


A. This section includes: [Manual] or [Electric] operated 5/8” thick metal backed insulated roller shutter.
1. Cycle life: Design doors of standard construction for normal use of 10,000 cycles standard [up to 400,000 cycles].
2. Design doors to withstand a windload of _____ psf.
B. Related Sections: Related to this section, but not limited to, the following (based on Master Format 2004):
1. Section 01660 – Product Storage and Handling Requirements.
2. Section 04220 – Concrete Unit Masonry.
3. Section 05120 – Structural Steel.
4. Section 06100 – Rough Carpentry.
5. Section 08310 – Access Doors and Panels.
6. Section 08710 – Door Hardware.
7. Section 09290 – Gypsum Board.
8. Section 09900 – Paints and Coatings.
9. Section 26000 – Electrical.

ASTM A 653/A 653M – Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
B. ASTM A 36 – Standard Specification for Carbon Structural Steel, Hot Rolled Steel
C. ASTM A 123 – Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
D. ASTM A 312 – Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
E. ASTM A 240 – Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
F. ASTM A 276 – Standard Specification for Stainless Steel Bars and Shapes
G. ASTM B 209 – Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
H. ASTM B 221 – Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
I. ASTM D 4549 – Standard Specification for Polystyrene and Rubber-Modified Polystyrene Molding and Extruding Materials (PS)

Submit under provisions of Section 01300.
B. Product Data: Provide manufacturer’s standard details and catalog data. Provide installation instructions.
C. Shop Drawings: Furnish shop drawings for architect’s approval. Include elevation, sections, and details indicating dimensions, materials, finishes, conditions for anchorage and support of each door.
D. Submit manufacturer’s recommended operation, troubleshooting, and maintenance instructions.

Manufacturer: Rolling doors shall be manufactured by a firm with a minimum of five years experience.
B. Single-Source Responsibility: Manufacturer shall provide doors, tracks, motors, and accessories for each type of door. Secondary components shall come from a source acceptable to the manufacturer of the primary components.

Deliver materials in original packaging supplied by manufacturer with intact labels. Store materials away from harmful environmental conditions and construction.

Door Warranty: Provide one year written warranty from date of installation against deficiencies due to defects in materials or workmanship. Installer agrees to repair or replace any defects in materials or workmanship.
B. Project Warranty: Refer to Conditions of the Contract for project warranty provisions.

A. Manufacturer:
Alpine Overhead Doors, Inc.; 8 Hulse Road Suite 1S, East Setauket, NY 11733. Telephone 800-257-4634 or 631-473-9300. Fax 631-642-0800.
B. Model: IMB V5® Insulated Rolling Service Door

A. Curtain:

1. Slats: Constructed of 5/8” thick interlocking, roll-formed Insulated Metal Backed (IMB) V5 slats. (Slat construction allows for dual coiling flexibility)
a) Slat/Back Cover Material:
i) Galvanized steel, G90 coating exterior (G60 interior), Structural Quality Grade C, as per ASTM A 653/ A 653 M
Finish (Can be different for exterior/interior): Galvanized [Powder coated] [Baked enamel] (Minimum coating conforming with Coating Designation G-01 is required)
– OR –
ii) ASTM 240 Stainless steel 300 series Finish (Can be different for slat and back cover): [Mill finish #2B] [#4 satin finish]
– OR –
iii) Aluminum
Finish: Mill Finish [Clear anodized] [Bronze anodized] [Black anodized]
b) Insulation: Polystyrene [foamed-in-place Polyurethane]
i) Thickness: 5/8”
ii) R-Value: 5/8 inch thick slats with an R-Value: 6.82 (U-factor of 0.147)
calculated using the ASHRAE Handbook of Fundamentals.
c) Gauge: (Per manufacturer’s standard)
i) Front slat: Minimum 22 gauge [20, 18, 16 gauge] steel or .050” thick aluminum.
ii) Back cover: Minimum 24 gauge [22, 20] steel or .040” thick aluminum.
2. Endlocks and Windlocks (as required):
a) Ductile cast iron, hot-dip galvanized endlocks riveted (solid rivets, minimum 3/16” thick) to each end of alternate slats to prevent lateral movement and to limit slat deflection and bending stress. [Windlocks are dependent on windload and increase resistance to curtain jamming]
3. Bottom Bar:
a) Two roll formed galvanized steel [stainless steel] [aluminum] angles, minimum 2” x 2” x 1/8”, which extend into guides, designed to reinforce curtain bottom. (Size dependent on dimensions per manufacturer’s standard)
i) Galvanized Steel as per ASTM A 653/ A 653 M
Finish: Gray shop prime [Powder Coated] [Baked Enamel]
– OR –
ii) ASTM 240 Stainless Steel 300 Series
Finish: [Mill finish #2B] [#4 satin finish]
– OR –
iii) Aluminum
Finish: Mill Finish [Clear anodized] [Bronze anodized] [Black anodized]
4. [Vision Lite panels]: Provide 6” by 1 ¼” oval acrylic panes set into curtain. (Choose number and placement)
B. Guides for Insulated Fire Door:
1. Guides shall be designed using structural angles with a minimum thickness of 3/16”, minimum 1 ¼” slotted connections, and removable bellmouth curtain stops to allow for curtain maintenance without removal of guides. Bellmouth stops shall be flush with guide groove. Guides shall be fastened with minimum 3/8” bolts at minimum 24” o.c.
a) Material:
i) ASTM A 36 Carbon Structural Steel
Finish: Gray shop prime coat [ASTM A 123 Galvanized] [baked enamel paint] [powder coated].
– OR –
ii) ASTM 276 Stainless Steel 300 Series
Finish: [Mill finish #2B] [#4 finish satin]
– OR –
iii) Extruded Aluminum
Finish: Mill Finish [Clear anodized] [Bronze anodized] [Black anodized]
C. Door Support Brackets and Mounting Plates for Insulated Fire Doors:
1. Steel plate not less than 1/4” thick. Provide ball bearings at rotating support points. Bolt plates to wall mounting angles with minimum 1/2″ fasteners. Plate supports counterbalance assembly and forms end enclosures.
a) Material:
i) ASTM A 36 Carbon Steel:
Finish: Gray shop prime coat [ASTM A 123 Galvanized] [Baked enamel paint] [Powder coated].
– OR –
ii) ASTM 240 Stainless Steel 300 Series
Finish: [Mill Finish #2B]
b) [Stop Lock bearing]: To prevent door from free falling in the event drive operation fails.
D. Counterbalance Assembly: Torsion
1. Counterbalance assembly: Steel pipe barrel of a size capable of carrying a curtain load with a maximum deflection of 0.03” per foot of door width. Heat-treated helical torsion springs encased in a steel pipe and designed to include an overload factor of 25% to ensure minimum effort to operate. Sealed and prelubricated high speed ball bearing at rotating support points. Torsion spring charge wheel for applying spring torque and for future adjustments.
a) Material:
i) ASTM A 36 Carbon Structural Steel
Finish: Gray shop prime coat [A 123 Hot-Dip Galvanized]
– OR –
ii) A 312 Stainless Steel 300 Series
Finish: Mill finish
b) Life Cycle: High Cycle springs designed to satisfy 10m through 400m life cycles. Consult engineering if height exceeds width for any cycle above 20m. (Cycle defined as one time opening and closing of door)
E. Hood for Insulated Fire Door:
1. 24 gauge steel [.040” aluminum]. Formed to fit the contour of the end brackets with reinforced top and bottom edges. Provide support bracing for doors wider than 20 feet at every 10 feet to prevent excessive sag. Fastened to end brackets.
2. Shape: Hexagon [square] [round]
3. Material:
a) Galvanized Steel as per ASTM A 653/ A 653 M
Finish: [Baked enamel paint] [Powder coated]
– OR –
b) ASTM 240 Stainless Steel 300 Series:
Finish: [Mill finish #2B] [#4 satin finish]
– OR –
c) Aluminum
Finish: Mill Finish [Clear anodized] [Bronze anodized] [Black anodized]
4. [Fascia]: Galvanized [Stainless Steel] [Aluminum], provided where areas behind door hood are open. Materials and finish same as hood.
F. Locking of Insulated Roller Shutters:
1. Slide locks: Provide padlockable slide locks for latching and locking door on coil side bottom bar at each jamb extending into slots in guides. [Cylinder Locks] (Electric Interlocks recommended with motorized doors only)
2. Manual chain hoist: Provide padlockable chain keeper on guide.
G. Weatherstripping:
1. Bottom Bar: Vinyl astragal.
2. Guides: Snap-on vinyl.
3. Hood: Neoprene baffle.
4. [Lintel baffle]

Opening/Closing: Manual push-up [Manual hand chain] [Manual hand crank] [Motor Operator].
B. [Manual hand chain]:
1. Provide chain hoist operator with endless steel chain, chain pocket wheel and guard, geared reduction unit, and chain keeper secured to guide.
C. [Manual hand crank]:
1. Provide crank hoist operator including crank gear box, steel crank drive shaft and geared reduction unit. Fabricate gear box to completely enclose operating mechanism and be oil-tight.
D. [Motor Operators]:
1. Choose ONE:
a) Medium-Duty, Alpine® Model Redi-Hoist™ driven by efficient V-belt primary drive with chain/sprocket secondary. Maximum ½ hp. For use on doors up to 10’ x 10’.
– OR –
b) Industrial-Duty, Alpine® Model Redi-Lift™ driven by heavy-duty V-belt with chain/sprocket secondary reduction. Optional auxiliary chain hoist. Maximum 1 hp. For use on doors up to 12’ x 12’.
– OR –
c) Heavy Industrial-Duty, Alpine® Model Redi-Master™ driven by heavy-duty worm gear in oil bath reduction. Standard auxiliary chain hoist. Standard ½ hp (maximum 5 hp)
– OR –
d) Redi-Tube® Tubular Motor with Built-In Manual Handcrank Overdrive. Auxiliary chain hoist not available. For use on doors up to 10’ x 8’.
2. [Sensing Edges] (For double angle bottom bar): For motorized doors, sensing edges allow door to go up in case of obstruction. [Pneumatic Edge] [Electric Edge] [Wireless Edge].
a) Colors: Gray [Yellow] [Black] [White] [Yellow with black stripes]

2.04 Mounting:
1. Interior face mounted on prepared opening.
2. Interior mounted between jambs and under lintel in a prepared opening.
3. Exterior face mounted on prepared opening.


Verify that dimensions are correct and project conditions are in accordance with manufacturer’s installation instructions; do not proceed with installation until unacceptable conditions have been corrected.

Install units in accordance with manufacturer’s instructions.
B. Ensure that units are installed plumb and true, free of warp or twist, and within tolerances specified by manufacturer for smooth operation.

Test doors for regular operation.

Instruct the Owner’s personnel in correct operation and maintenance of units.

Clean units in accordance with manufacturer’s instructions.
B. Restore slight blemishes in finishes in accordance with manufacturer’s instructions to match original finish. Remove and provide new units where repairs are not acceptable to the Architect.

Disclaimer: All data provided on this website is to be used for information purposes only, and is subject to change without prior notice. Alpine shall not be liable for technical or editorial errors or ommisions contained herein, nor for direct, incidental, consequential or any other damages resulting from furnishing, performance, or use of this information, even if Alpine Overhead Doors, Inc. has been advised of the possibility of such damages in advance. See the additional disclaimer in our Terms of Use.

In the time of rising energy costs, Alpine recognizes the need for better protection against the elements. To help combat this problem, Alpine offers the IMB-V5 insulated roller shutter design. Insulated  fire doors offer thermal efficiency to help you save on expensive energy costs. The IMB-V5® insulated dock door is designed specifically to provide energy efficiency and insulation. These insulated fire doors utilize a heat resistant polystyrene with a low thermal transmittance factor.

The insulated fire door is constructed with a metal on metal insulated slat that has a polystyrene insulation a minimum of 5/8″ thick for the IMB-V5®. Slats are available in 24 or 22 gauge steel with a backing of 24 or 22 gauge steel and B.S. Aluminum in 22, 20 front slat insulation of these dock doors fills all voids for better thermal protection.

IMB-V5 Curtain