FAQ
Garage Door Questions, Answered — Page 9
More in-depth answers from Denver’s G Brothers Garage Doors. Tap any question for the full guide, or use search to jump straight to a topic.
Commercial
Commercial questions
Do I need a building permit for a commercial garage door in Denver?
Yes.
Read answerCommercialWhat is a commercial jackshaft operator and does it need a separate lock?
A commercial jackshaft operator mounts on the wall beside the door and turns the torsion shaft directly, instead of pulling a trolley along a center rail.
Read answerCommercialWhat is the difference between a commercial and a residential garage door opener?
Commercial openers are built for heavy doors, high daily cycle counts, and continuous operation under multiple users.
Read answerCommercialWhat is a high-speed fabric commercial door and when should I use one?
A high-speed fabric commercial door opens at up to 100 inches per second, five to eight times faster than a standard rolling steel door.
Read answerCommercialWhat are the most common problems with roll-up commercial garage doors?
The five most common problems are: coil drum wear, bottom bar damage, spring failure, operator motor failure, and guide rail damage.
Read answerCommercialDoes a rolling steel commercial door require ceiling clearance?
A rolling steel door needs minimal headroom because the curtain coils into a compact drum directly above the opening.
Read answerCommercialHow often must a rolling steel fire door be tested in Colorado?
Every fire-rated rolling steel door must receive a formal drop test once per year under NFPA 80.
Read answerCommercialWhat are the safety requirements for a commercial garage door?
A commercial garage door needs a UL 325 listed operator with a monitored photo eye or sensing edge, must meet the building and fire codes your city adopts, needs a yearly NFPA 80 test if it is fire rated, and falls under OSHA's duty to keep the workplace free of known hazards.
Read answerCommercialWhat size is a standard loading dock door?
Most loading dock doors are 8 or 9 feet wide and 8 to 10 feet high. 8 x 9 is the most common, while 9 x 10 fits today's trailers best.
Read answerCommercialHow do I open a commercial roll up door manually?
Cut the power, then use the chain hoist or floor disconnect, or lift a door with no motor by its bottom bar. Stop if it feels far heavier than normal.
Read answerCommercialWhy won't my commercial garage door close?
Usually the photo eyes or reversing edge are blocked or faulted, so the operator closes only while someone holds CLOSE. Check interlocks and limits too.
Read answerCommercialWhy won't my commercial garage door open?
Usually a broken spring or cable leaves the door too heavy, a lock or chain hoist interlock cuts the controls, the power or STOP button is off, or a rolling fire door dropped and needs a reset.
Read answerCommercialWhen should you replace loading dock seals?
Replace dock seals when the pads are torn, flattened or show foam, or when daylight shows around a parked trailer. Check them monthly.
Read answerCommercialWhy is my hydraulic dock leveler not working?
A hydraulic dock leveler usually fails from lost power, low or leaking fluid, a tripped safety stop, debris in the pit or a worn lip hinge.
Read answerCommercialWhen should loading dock bumpers be replaced?
Replace a dock bumper when about half its rubber is worn, the pads are flush with the steel, the steel is bent or rusted, or the anchors are loose.
Read answerCommercialWhy is my storage unit roll-up door hard to open?
A storage unit door that is hard to lift but easy to close usually needs more spring tension; dirty or bent guides, dents, the latch or ice can also make it stick.
Read answerCommercialWhy is my rolling security grille stuck?
A stuck rolling security grille usually has a bent or dirty guide, a bent row of links, a twisted bottom bar or lock, or springs that lost tension; the spring is a technician's job.
Read answerCommercialWhy is my high-speed door not working?
A high-speed door that stops working has usually lost power, has a blocked, dirty or misaligned photo eye, had its curtain knocked out of its tracks, or has an activator, limit or drive fault; the drive, brake and controls are a technician's job.
Read answerCommercialSectional vs rolling steel commercial door: which is right for you?
Pick a sectional door for insulation, windows and a quieter door where the ceiling has room for tracks; pick a rolling steel door where space around the opening is tight or security, wind load or a fire rating comes first.
Read answerCommercialWhy is my rolling counter shutter stuck?
A stuck rolling counter shutter usually has dirty or bent guides, a bent slat or loose endlock, a crooked bottom bar or lock, or springs that lost tension; the spring is a technician's job.
Read answerCommercialWhy did my commercial garage door come off track?
Usually a truck, forklift or load hit the track or door. Broken cables or springs, worn rollers and loose track brackets cause the rest. Stop using it, cut the power and call a technician.
Read answerCommercialHow do you adjust the spring tension on a roll up door?
If the door is easy to close but hard to open, it needs more tension; hard to close and easy to open, less. A trained technician adjusts it at the barrel's tensioner.
Read answerCommercialWhy won't my loading dock door stay up?
Almost always the springs: they have lost tension, worn out or broken, or a cable slipped. Close the door, keep traffic clear and call a trained technician.
Read answerCommercialWhat is the difference between a dock seal and a dock shelter?
A seal is foam pads the trailer presses into; a shelter is a frame with curtains that wrap the trailer. Seals seal tighter, shelters fit mixed trailers.
Read answerCommercialWhat are the types of dock levelers?
Dock levelers are sorted by mounting (pit, edge-of-dock, vertical), by drive (mechanical, hydraulic, air) and by lip. Busy docks use hydraulic pit levelers.
Read answerCommercialHow long do commercial garage doors last?
A commercial garage door lasts as many cycles as its parts can take. Divide each part's cycle rating by the door's daily cycles to see when it will wear out.
Read answerCommercialHow do I lubricate a roll up door?
Oil a roll up door's chain and gears, grease its bearings at the fittings, keep the guides and curtain clean, and leave the tension wheel to a technician.
Read answerStill have a question?
Call us and describe what your door is doing. We will tell you what is likely wrong and what it costs.