Glossary of Garage Door Terms

Astragal
Weather-stripping added to bottom section of a garage door to seal the opening along the floor

Bottom Bracket
Lifting cables are attached to this structured support

Cable Drum
Found on the torsion spring shaft that lifting cables wind around when the garage door is opening

Extension Springs
On either side of the track, often used on lighter doors and single car garages

Measuring Terms
Headroom – The amount of space inside the garage between the top of the garage door and the ceiling
Backroom – The inside length of the garage from front to back
Sideroom – Distance between the sides of the garage door and the side walls of the garage

Sections
Panels interconnected with hinges and rollers

Struts
Hold the sections flat when the garage door is in the “up” position

Torsion Springs
The way the garage door raises and lowers. Typically one or two along the wall above the door opening for heavier doors and 2 or 3-car garages).