Garage Door Repair Glossary

Every trade has its own language. This Agoura Hills garage door repair glossary translates the terms that show up on estimates and inspections into clear, everyday English — so you always understand exactly what's being recommended and why.

David Anderson Brothers Garage Door Repairs Inc believes an informed customer is a confident one. This glossary defines the garage door repair terms that come up during our services and on every written estimate. Bookmark it, and reach out anytime a term isn't clear — we're always glad to explain.

Torsion spring

The tightly wound spring mounted above the door that stores energy and does the heavy lifting to raise and lower it. Under high tension, it should only be serviced by a professional.

Extension spring

A spring that runs along the horizontal track and stretches to counterbalance the door's weight; common on lighter, single-car doors. David Anderson Brothers Garage Door Repairs Inc is glad to explain how this affects your Agoura Hills home during a free estimate.

Track

The metal channels on each side that guide the door's rollers as it moves; bent or misaligned track causes binding and noise. David Anderson Brothers Garage Door Repairs Inc is glad to explain how this affects your Agoura Hills home during a free estimate.

Roller

The small wheels attached to the door's edges that ride inside the track, letting the door move smoothly. If it shows up on your quote, David Anderson Brothers Garage Door Repairs Inc will walk you through it in plain language.

Opener

The motorized unit that automatically raises and lowers the door via a belt, chain, or screw drive, operated by remote or wall button. If it shows up on your quote, David Anderson Brothers Garage Door Repairs Inc will walk you through it in plain language.

Photo-eye sensor

Two aligned safety sensors near the bottom of the opening that reverse the door if something breaks the beam — a federally required safety feature. If it shows up on your quote, David Anderson Brothers Garage Door Repairs Inc will walk you through it in plain language.

Limit switch

The setting inside the opener that tells the door exactly how far to travel; misadjustment makes the door stop short or fail to seal. Our technicians point terms like this out to Agoura Hills homeowners as part of the work we do.

Weatherstripping

The flexible seal around the door's perimeter that keeps out drafts, rain, dust, and pests. David Anderson Brothers Garage Door Repairs Inc is glad to explain how this affects your Agoura Hills home during a free estimate.

R-value (insulation)

A measure of how well a garage door resists heat transfer; a higher R-value means better insulation and a more energy-efficient garage. David Anderson Brothers Garage Door Repairs Inc is glad to explain how this affects your Agoura Hills home during a free estimate.

Cable drum

The grooved wheel at each end of the torsion shaft that winds and unwinds the lift cables to raise the door evenly. David Anderson Brothers Garage Door Repairs Inc is glad to explain how this affects your Agoura Hills home during a free estimate.

Bottom seal

The rubber gasket along the bottom edge of the door that compresses against the floor to block water, drafts, and debris. Our technicians point terms like this out to Agoura Hills homeowners as part of the work we do.

Travel module

The component in newer openers that tracks the door's position and force, enabling accurate stopping and safety reversal. Our technicians point terms like this out to Agoura Hills homeowners as part of the work we do.

Trolley

The carriage that connects the opener's drive to the door arm and pulls the door along the rail. Our technicians point terms like this out to Agoura Hills homeowners as part of the work we do.

Manual release

The red cord that disengages the door from the opener so it can be operated by hand during a power outage or emergency. Our technicians point terms like this out to Agoura Hills homeowners as part of the work we do.

Frequently Asked Questions