Thermacore 591 Insulated Sectional Door

Thermacore 591 Insulated Sectional Door

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.

Design Highlights

  • 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 cycles
  • Wind Load – Designs available for usage in high-wind conditions
  • Warranty
    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
  • Impact Section Available
  • Four-section pass door
  • High performance fluoropolymer coating (Trinar® or equivalent)
  • Wind load options
  • Insulated glass, tempered glass, polycarbonate, multi-wall polycarbonate, etc.
  • High-usage package
  • Electric operator
  • Chain hoist
  • Posi-Tension™ drums
  • Safety bottom fixture
  • Bottom-sensing edge
  • Flexible jamb, header seal
  • Exhaust ports ​
  • Window Glazing Options​


High performance fluoropolymer coating (Trinar® or equivalent) finish option available in white, brown and beige. Offers superior performance.

Actual door color may vary from the digital representation shown here. Color samples are available by request through your Overhead Door™ Distributor. ​​​

  • White
  • Tan
  • Industrial Brown​​​​​​​​​
  • Gray​


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