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Thermacore® Sectional Steel Doors - 591
Thermacore® Sectional Steel Doors - 591

    Thermacore® Sectional Steel Doors - 591

    ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​When your project requires a sectional door with an exceptional degree of thermal efficiency, the Thermacore® Sectional Steel Door Model 591 is a proven performer. The Thermacore® steel-polyurethane-steel panel construction provides a thermal barrier that withstands extreme climatic conditions and the most demanding environmental requirements.

    This 1 5/8” (41 mm) thick, heavy duty door fits a wide range of opening sizes and the spectrum of applications — making it the best-selling door system in the Thermacore® line and one of the most-specified insulated sectional doors in the industry. Boasting an R-value of 14.86 (2.63 W/m2), a U-value of .067 (.380 m2/W), and one of the best air infiltration ratings, the Thermacore® 591 will meet or exceed almost any thermally efficient application requirement.

    Strong, Lightweight, Attractive and Durable.
    Thermacore® 591 sectional steel doors feature roll-formed, hot-dipped galvanized steel exterior panels designed for exceptional strength and sound suppression capabilities. Wind load design available for usage in high-wind conditions. Two coats of baked-on, polyester paint on a ribbed, textured exterior surface provide a handsome finish that will last for years. Our industry-leading 10-year limited warranty against delamination means that we’ll stand behind the quality of our doors at the outset and for the long haul.

    Superior Field Serviceability.
    Thermacore® has a special internal construction which allows hinges to be placed anywhere along the panel’s length permitting customization on the job site — for fast and precise installation, repair or retrofit.

    Built With the Best Technology in the Business.
    This sectional steel door is manufactured using Overhead Door Corporation’s proprietary, computer-controlled fabrication process. This advanced technology ensures adherence to the industry’s strictest product tolerances and results in an exceptionally well-built door for outstanding thermal efficiency and longlasting performance.

    Many Options, Better Solutions.
    The Thermacore® sectional steel door model 591 fits openings up to 35'2" (10.7 m) wide and 24'1" (7.3 m) high. A full line of electric operators ensures precise and trouble-free motor operation in a variety of mounting options (side, center or trolley). Available options include aluminum sash section, thermal glazing, pedestrian pass door, impact panel, and jamb weatherstripping. Optional high-usage components expand the versatility of the 591 to high-cycle conditions, with torsion springs in 25k, 50k, 75k or 100k cycles, a solid-steel shaft to reduce fatigue and deflection, and a heavy-duty 3" (76 mm) steel track for added durability.​​​

    BIM objects are for general reference and should not be used for exact construction information. Please contact an Overhead Door Distributor when exact dimensions are required.

    • Standard Features

      Standard max width: 35'2" (10,719 mm)

      Standard max height: 24'1" (7,341 mm)

      Panel thickness: 1 5/8" (41 mm)

      R-value: 14.86 (2.63 W/m2)

      U-value: .07 (.38 m2/W)

      Air infiltration: at 15 mph (24 kmph) .08 cfm/ft2 (1.46 m3/hr/m2)

      Thermal break: PVC

      Exterior Steel: .015" (.38 mm) galv.

      Exterior Surface: ribbed, textured

      Standard springs: 10,000 cycle

      Wind load: Designs available for usage in high-wind conditions


      10-year limited delamination
      1 year limited on door
      3 year/20,000 cycle limited on door & operator system (when purchased together; on material and workmanship)
      20-year limited on high performance fluoropolymer coating option

      ​​Door Options

      • Chain Hoist or Electric Operator is recommended for doors above 10’ tall or more than 400 pounds
      • Aluminum sash section available up to 24'2" (7,366 mm) wide
      • Insulated glass, tempered glass, polycarbonate, multi-wall polycarbonate, etc.
      • High performance fluoropolymer coating (Trinar® or equivalent)
      • Four-section pass door
      • High-usage package
      • Wind load options
      • Electric operator
      • Chain hoist
      • Posi-Tension™ drums
      • Safety bottom fixture
      • Bottom-sensing edge
      • Flexible jamb, header seal
      • Exhaust ports ​
      • Window Glazing Options​
      • Impact Section Available
    Technical specification
    • Unique ref.thermocore-sectional-steel-doors-591
    • Product familyCommercial Doors
    • Product groupSectional Doors
    • TypeObject (single object)
    • Date of publishing2022-12-16
    • Edition number1
    • Material mainSteel
    • Designed inUnited States
    • Manufactured inUnited States
    • BIMobject CategoryDoors - Industrial Doors
    • IFC classificationDoor
    • CSI MasterFormat 2014 Code08 36 13
    • CSI MasterFormat 2014 TitleSectional Doors
    • OmniClass Number23-17 11 13 25 13
    • OmniClass TitleSectional Overhead Metal Doors

    Region availability

    North America
    Antigua and Barbuda
    British Virgin Islands
    Caribbean Netherlands
    Cayman Islands
    Collectivity of Saint Martin
    Costa Rica
    Dominican Republic
    El Salvador
    Puerto Rico
    Saint Kitts and Nevis
    Saint Lucia
    Saint Pierre and Miquelon
    Saint Vincent and the Grenadines
    Sint Maarten
    The Bahamas
    Trinidad and Tobago
    Turks and Caicos Islands
    U.S. Virgin Islands
    United States