591 Series Thermacore Door

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​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. 



R Value: 14.86

U Value: .07

Thermal Break: PVC

Air Infiltration: at 15mph .08 cfm/ft2, at 25 mph .08 cfm/ft2


Panel Thickness: 1-5/8"

Max Height: 24' 1"

Max Width: 35' 2"

Exterior Steel: .015" galv.

Exterior Surface: Ribbed, Textured

Standard Springs: 10,000 Cycle

Panel Options
Ribbed, Textured.JPG
Secton Info.JPG

Ribbed, Textured Panel

Color Options









Trinar White

Trinar Beige

Trinar Brown

Window Options
25x12 Double Thermal Acrylic.JPG

Double Thermal Acrylic 12" x 12"

Alumimum Sash Sec. DSB Glazing.JPG

Aluminum Sash Section with DSB Glazing

24x7 DSB Insulated.JPG

Insulated DSB 24" x 7"

Door Features

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.