Advanced Sectional Doors

Thermacore® AP - Advanced Performance Commercial Sectional Garage Doors

Thermacore® AP Door Model 850 is engineered to deliver advanced performance in commercial and industrial applications where climate control, durability, and ease of maintenance are primary concerns. This sectional steel door system presents the most advanced thermal performance values published by any major US manufacturer of 3" commercial insulated sectional doors.

The Thermacore® AP door system’s advanced performance answers the demand for more thermal efficiency, reliability, durability and design flexibility. The 850 door is the ideal choice for thermal protection against heat or cold in heavy duty applications, including agricultural buildings, food, and beverage storage facilities, pharmaceutical facilities, climate controlled facilities, industrial manufacturing facilities, government facilities, and shipping and receiving docks.

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Standard max width

40'2" (12,243 mm)

Standard max height

24'1" (7317 mm)

Panel thickness

3" (76.2 mm)


26 (4.58 Msq/W)


0.038 (.22 W/Msq)

Installed U-Factor

.14 Btu/hr x ft² x Fº (.80 W/Msq)

Air infiltration

At 15 mph (24 kmph) .09 cfm/ft² (1.65 m³/hr/m²)

Thermal break

1-3/4" wide PVC thermal break; PVC thermal break on end stiles


10 year limited delamination
1 year material and workmanship
3 year/20,000 cycle door and operator system (material and workmanship)

* R-value is a measure of thermal efficiency. The higher the R-value the greater the insulating properties of the door. Overhead Door Corporation uses a calculated door curtain R-value for our insulated doors.

**U-value is a measure of the flow of heat through an insulating or building material; the lower the U-value, the better the insulating ability. U-value is the inverse of R-value.

† Installed U-factor is a tested value of actual energy loss - whether heat or cold - of an installed door, wall, or window assembly (calculated per ASHRAE). The lower the number the lower the energy loss and therefore the better the thermal performance. For best U-factor, choose finish and color with high solar reflectance (bright colors).

*3 year limited warranty coverage on door and operator when purchased together.


Exterior color options





Finish options include two coats of baked-on polyester paint, available in four colors to blend with the design aesthetic of the facility. Actual door color may vary from the digital representation above. Color samples are available by request.

Additional Options

  • Chain Hoist or Electric Operator is recommended for doors above 10’ tall or more than 400 pounds
  • Large thermal lites (25" w x 13" h); black frame standard
  • Optional color matched frame available
  • Glass: insulated, insulated tempered, multi-wall polycarbonate in clear, bronze, or white
  • High-cycle springs
  • High-usage components
  • Electric operator
  • Chain hoist
  • Cable failure device
  • Bottom sensing edge
  • Exhaust Ports (available in 3" and 4")
  • Window Glazing Options

For applications with advanced security and safety needs consider extra locks, a sensing edge, photo-eyes, and a cable failure device. For high usage projects consider the high cycle springs and high cycle components package. Ask us for more information about the special applications options.