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Glossary of Garage Door Terms - Hi to M

To make the independent sections act as a complete door, the sections must be hinged together. Hinges are found on the end stiles and center stiles at the meeting rails. All hinges perform two basic functions:

  1. They join the sections together with bolts or screws.
  2. They allow the sections to break, independent of each other, as the door travels.

Hinges on the end stiles perform two additional tasks:

  1. They are designed to support a roller on which the door travels.
  2. They are offset to provide a flush fit to the door itself when in the closed position.

Horizontal Track:
An assembly usually made up of a section of track and reinforced with an angle that is used to both guide and support the door in the horizontal position. Furnished with an integral section of curved track. Refer to Radius.

Inclined Track:
Tapered vertical track and a graduated height of edge hinges which assure a weather tight fit between door and jamb.

Inside Lock:
Spring loaded, sliding deadbolt lock operable only from interior of the door.

Material that has the ability to reduce heat or cold transmission.

Insulation Terms:

  • BTU:
    Amount of heat necessary to raise the temperature of one pound of water one degree Fahrenheit.
  • K-Value: (Thermal Conductivity)
    Laboratory determined value of thermal conductance of a material.
  • R-Value: (Thermal Resistance)
    Ability of a material to retard the transmission of heat. The higher the R-value, the better the insulating performance.
  • U-Value: (Heat Transmission Coefficient)
    Amount of heat, in BTU, is transmitted through one square foot of material (the door) in one hour at a temperature difference of 1°F from one side to the other. The lower the U-value, the better the insulating material.

Jamb Seal:
Weather-stripping attached to the door jamb to provide a seal along the jambs.

The upright framing on each side of the door opening. When wood jambs are specified, the vertical track is mounted to the inside surface of the jamb and the stop molding is nailed to the side surface within the opening. For steel jambs, refer to Reverse Angle Mounting. For wood or masonry jambs, refer to Bracket Mounted Track and Angle Mounted Track.

Lift Clearance:
Refers to track hardware that causes the door to rise vertically some distance before it levels out into a horizontal position. Also known as High Lift Track, Lift-Clearance is the distance above the top of door opening to the underside of horizontal tracks (Commercial door application).

A handle, normally on the bottom section of the door, to assist in manually lifting the sectional door.

Frames glazed with glass or clear plastic. Number of panels in a section limits quantity of lights that can be installed. May be double glazed for insulation value. Refer to Full Vision Section.

Low Headroom:
Track hardware accessories to provide for door installation with minimum headroom conditions.

Meeting Rail:
The top or bottom horizontal rail in any section that meets and joins with an adjacent door section in horizontal rail.

Mounting Plates:
Flat steel or wood members placed on the wall to accommodate spring support, spring shaft bearings, chain hoists and mountings for operators.

A bar member supporting and separating panes of glass within a sash or door.

A to C

D to He

O to Si

Sp to Z