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Commercial Sectional Doors 

The Thermacore® AP 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 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.

Door Options

Exterior color options

color swatch white
color swatch brown
color swatch almond
color swatch taupe

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

Window Glazing Options

Additional Options

  • Large thermal lites (25" w x 13" h)
  • 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


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)

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