Garage Door Repair Glossary

This glossary is your quick-reference tool to decode the jargon you’ll hear when your Stratham garage door acts up. Knowing these terms helps you spot issues early, ask the right questions, and protect your home from costly surprises—before winter’s freeze tests every hinge and spring.

Stratham homeowners know that a smoothly running garage door is a year-round necessity, from summer beach gear storage to winter snow-blower access. Yet when repair talk turns to springs, tracks, or sensors, even savvy DIYers can feel lost. We’ve put together this plain-English glossary so you can confidently discuss repairs, maintenance, or upgrades with any technician. Whether you’re in Stratham Village or off Route 108, bookmark this page before your next service call or free estimate.

Torsion spring

A tightly wound metal spring mounted above your garage door that counterbalances the door’s weight, making it easy to open and close. Unlike extension springs that stretch, torsion springs twist to store energy. Because they’re under extreme tension, they should only be replaced by trained professionals—DIY attempts can cause serious injury. In Stratham’s freeze-thaw winters, a worn torsion spring often fails just when you need the garage most.

Extension spring

A spring that stretches along the sides of your garage door tracks, pulling the door upward when you open it. These springs are less expensive than torsion springs but wear out faster, especially in coastal Stratham where salty air speeds up metal fatigue. If one snaps, the sudden release can damage your door or injure someone nearby—always call a pro for spring replacement.

Track

The metal channels—usually two vertical and one horizontal—that guide your garage door as it opens and closes. Tracks must stay aligned and free of debris; even a small dent can derail the door or force the opener to work overtime. In Stratham, winter ice and summer pollen can clog tracks, so check them monthly during preventative maintenance.

Roller

Small wheels attached to the sides of your garage door that roll inside the tracks, keeping the door aligned and reducing friction. Nylon rollers last longer than steel in Stratham’s humid summers, but they still wear out over time. If you hear grinding or see uneven movement, it’s likely time to replace the rollers—don’t wait for a full breakdown.

Opener

The electric motor that automatically lifts and lowers your garage door, controlled by a remote, keypad, or smartphone app. Modern openers include safety features like auto-reverse and rolling-code encryption to prevent break-ins. If your opener hesitates or makes strange noises, it may need lubrication or a repair before winter’s first Nor’easter.

Photo-eye sensor

A pair of small plastic housings mounted near the bottom of your garage door that send an invisible beam across the doorway. If the beam is broken while the door is closing, the sensor signals the opener to stop and reverse immediately. These sensors are a critical safety feature—test them monthly by waving an object in front of the beam to ensure they’re working.

Limit switch

An adjustable control inside your garage door opener that tells the motor when to stop opening or closing the door. If the switch is set too short, the door won’t fully close; if it’s too long, the door may slam into the floor. In Stratham homes with uneven driveways, incorrect limit settings are a common cause of opener strain and premature wear.

Weatherstripping

The rubber or vinyl seal along the bottom and sides of your garage door that blocks drafts, rain, and pests. High-quality weatherstripping with a high R-value keeps your garage warmer in winter and cooler in summer, saving on energy bills. In coastal Stratham, UV rays and salt air degrade weatherstripping faster—inspect it twice a year and replace it if it’s cracked or brittle.

R-value (insulation)

A number that measures how well your garage door’s insulation resists heat flow. A higher R-value means better temperature control inside your garage. For Stratham homes with workshops or living spaces above the garage, an insulated door with an R-value of 12 or higher can cut energy costs by up to 20%. Ask us about energy-efficient upgrades before the next cold snap.

Cable drum

A grooved wheel at the top of your garage door that winds and unwinds the lift cables as the door opens and closes. If a cable drum is cracked or the grooves are worn, the cable can slip or snap, causing the door to fall. In Stratham’s older homes, cable drums often show their age—have them inspected during your annual maintenance.

Bottom seal

The thick rubber strip attached to the bottom edge of your garage door that seals the gap between the door and the driveway. A worn bottom seal lets in water, snow, and pests—especially problematic in Stratham’s low-lying areas like Route 108. Replace it if you see daylight under the door or water pooling inside after rain.

Travel module

The electronic brain inside your garage door opener that controls the door’s movement, including speed, force, and safety features. If your opener starts acting erratically—jerking, stopping midway, or ignoring remote commands—it’s often a sign the travel module is failing. Don’t ignore these glitches; they can lead to a sudden door failure when you least expect it.

Trolley

The part of your garage door opener that connects the motor to the door via a metal arm, pulling it open and shut. If the trolley is bent or the arm is loose, the door may bind or the opener could overheat. In Stratham homes with heavy wooden doors, a sturdy trolley is essential for smooth operation—check its alignment during routine inspections.

Manual release

A red cord or handle inside your garage that disconnects the door from the opener in case of power loss or emergency. Pulling the manual release lets you open or close the door by hand. Always test it twice a year—especially before winter storms—to ensure it disengages smoothly and re-engages without jamming.

Frequently Asked Questions