Quick answer
The horizontal track is the section of garage door track that runs back under the ceiling from the curved radius, guiding the door’s rollers and holding the door when it is open.
DASMA describes the horizontal track assembly as track reinforced with an angle that guides and supports the door in the horizontal position. Its far end hangs from the ceiling on back hangs made of angle iron.
Quick facts
The key facts about Horizontal Track, with sources:
- DASMA definition
- Track used in the horizontal segment of a track assembly 1
- Assembly
- Horizontal track stiffened with an L-shaped angle 1
- Rear support
- Back hang: angle-iron hanger to the ceiling or roof structure 1
- Slight slope
- Horizontal rise helps start the door down and keep cable tension 1
- Code check
- Securely connected to structurally sound, load-bearing members 3
- Sagging track
- Should be stiffened with angle braces or back hangs 7
Key takeaways
- Horizontal tracks hold the open door under the ceiling.
- They are stiffened with an angle and hung from framing at the back.
- A slight upward slope helps the door start closing and keeps the cables taut.
- Sagging, twisting or loose hangers can let the door bind or roll out.
- Never hang storage from the tracks or their hangers.
What the horizontal track is
When a sectional door opens, its sections roll up the vertical track, through the curve, and back along the horizontal track until the whole door lies flat under the ceiling.
DASMA defines horizontal track simply as track used in the horizontal segment of a track assembly 1, and the horizontal track assembly as horizontal track reinforced with an angle, used to guide and support the door in the horizontal position 1.
The stiffening angle is the horizontal track angle, an L-shaped angle fixed to the track to stiffen it 1.
At the front, the track bolts to the radius and flag angle; at the back, it hangs from the ceiling on a back hang, which DASMA defines as a hanger made from angle iron that attaches the end of the horizontal tracks to the roof structure or ceiling 1.
How it supports the open door
With the door open, most of its weight sits on the horizontal tracks through the rollers, and the rest on the cables. The track and its hangers must carry that without bending.
On wide or heavy doors, a center track can be added; DASMA describes it as an extra track that helps prevent the door sagging when open, used on very wide or heavy doors or doors with a pass door 1.
The track is not quite level. DASMA defines horizontal rise as the upward slope of the horizontal track, which helps start the door downward and helps maintain cable tension 1. On a follow-the-roof install, the track instead follows the slope of the ceiling 1.
Horizontal track also carries the open door’s load during wall-mount opener operation. DASMA warns that horizontal track that sags or twists when the door is up should be stiffened with angle braces or back hangs 7.
Horizontal track parts and variants
| Part or variant | What it is | Source |
|---|---|---|
| Horizontal track angle | L-angle stiffening the track | DASMA 1 |
| Back hang | Angle-iron hanger to the ceiling | DASMA 1 |
| Angle brace (sway brace) | Lateral brace from back hang to ceiling | DASMA 1 |
| Center track | Extra track for wide or heavy doors | DASMA 1 |
| Contour track | Follows a sloped ceiling | DASMA 1 |
| Double track (low headroom) | Second pair of horizontal tracks | DASMA 1 |
Example: how long the horizontal track must be
The open door must fit along the horizontal track, which is why backroom is roughly door height plus an allowance. Clopay figures for standard track 2.
| Door height | Door length lying flat | Backroom needed (+16 to 18 in) |
|---|---|---|
| 7 ft (84 in) | 84 in | 100 to 102 in |
| 8 ft (96 in) | 96 in | 112 to 114 in |
Low-headroom setups need more: door height plus 23 to 30 inches 2. See backroom.
Where to look
Look up along each side of the ceiling from the top of the door opening back into the garage. The horizontal tracks run parallel, with an angle along each, and end at hangers fixed to the ceiling. On some doors, extension springs run alongside them 1.
DASMA’s post-storm visual inspection includes checking the track system for loose fasteners or misalignment 4.
Horizontal track and ceiling storage
Horizontal tracks are tempting places to hang bikes, hooks or shelves. Do not. The tracks carry the open door, and their hangers are sized for that load.
Extra weight can bend the track or pull a hanger loose, which can drop the open door’s back end. DASMA advises against attaching or hanging materials from any part of a garage door assembly 6.
Ceiling racks should be mounted to framing well away from the tracks and the open door’s path. Leave room above the open door for its rollers and hinges as well as the panel face.
The front and back ends of the track
At the front, the horizontal track joins the curved radius section and is bolted to the flag angle, the bracket that ties the vertical and horizontal track together at the top corner of the opening 1.
That joint carries the turning load as each section rolls from vertical to horizontal, so loose bolts there show up as a clunk at the top of travel.
At the back, the track must stop the door at the right point.
Many tracks end in a stop or bumper; DASMA describes a spring bumper as a mechanism on the horizontal track that eases the door to a stop at the top of its upward travel, reducing shock 1.
A missing or broken bumper lets the top section slam the end of the track each time the door opens.
Between the two ends, the back hangs and angle braces keep the track from twisting or swaying sideways. DASMA defines an angle brace as a lateral brace attached to the back hang and the roof structure or ceiling 1.
Wide doors and pass doors
The wider the door, the more it can sag in the middle when lying flat.
DASMA says a center track can be added to prevent sagging on exceptionally wide or heavy doors and on doors that contain a pass door 1.
Struts across the sections do a similar job from the door side; DASMA defines a strut as a stiffener that reduces deflection of the sections in the horizontal position 1.
If an open double-width door visibly bows in the middle, ask about struts or a center track before the sections crack at the hinges.
Keeping both tracks in line
The two horizontal tracks must be parallel, at the same height and the same distance apart along their whole length. If one side runs lower, the open door tilts and its rollers press harder on one track.
If the tracks spread apart toward the back, rollers can slip out of the channel when the door is fully open; if they pinch together, the door binds.
Hangers that loosen on one side are the usual cause. A technician checks spacing at the front and back with the door closed, then watches the door roll back to confirm every roller stays seated.
It is a quick adjustment when caught early and a damaged door when it is not. Ask for it at every yearly service.
Well-hung vs poorly hung track
Well hung
- Door rests steady when open.
- Rollers run smoothly into the curve.
- Cables stay taut 1.
Poorly hung
- Track sags or sways when the door moves.
- Rollers bind or pop out at the back.
- Hangers pull from drywall or weak framing.
What horizontal track cannot handle
Horizontal track cannot carry storage, and it cannot be fastened to drywall alone. DASMA publishes guidance on drywall surfaces and mounting hardware for this reason 8. It also cannot compensate for an out-of-balance door; balance comes from the springs.
What drives horizontal track repair cost
No prices here; see the cost guide.
How a technician fixes sagging track
- Closes the door so the tracks carry no door weight.
- Checks back hangs and fasteners into ceiling framing 3.
- Re-fastens or adds hangers and angle braces 7.
- Sets the slight rise and aligns both sides 1.
- Opens the door fully and checks it rests steady.
Upkeep
- Look at hangers and bolts once a year.
- Keep the channel free of debris.
- Watch the open door: it should not sag or sway.
- Keep storage off the tracks.
Warning signs
A hanger hanging loose, a track that sways when the door moves, a sag in the middle when open, or rollers that pop out near the back stop. Lower the door if it is safe to do so, stop using it, and call a technician 4.
Never stand under a sagging open door
If an open door’s track is sagging or a hanger has failed, the door could drop. Keep people and cars clear and call a technician. Do not try to prop it up yourself.
Rules
DASMA’s general code inspection checklist checks that horizontal tracks are securely connected to structurally sound, load-bearing members 3. On wind-rated doors, track and fasteners must match the certified drawing 5.
Horizontal track vs related parts
| Part | Role |
|---|---|
| Horizontal track | Holds the open door |
| Vertical track | Guides the door beside the opening |
| Radius | Curve between them |
| Opener rail | Separate track for the opener trolley |
| Extension springs | Run alongside on some doors 1 |
Myths
Tall and sloped ceilings
What to do
If track sags, sways or a hanger is loose, call a technician before using the door again. Plan ceiling storage away from the tracks. See track misalignment.
Check with the door open
Open the door fully and look along each track from the side. Sag shows up clearly against the straight ceiling line.
Questions about Horizontal Track
What is the horizontal track on a garage door?
The track under the ceiling that holds the door when it is open. DASMA describes it as track reinforced with an angle that guides and supports the door horizontally.
What is a back hang?
An angle-iron hanger that attaches the rear end of the horizontal tracks to the ceiling or roof structure, per DASMA.
Should horizontal track be level?
Not quite. Installers give it a slight upward slope, which DASMA calls horizontal rise, to help start the door down and keep cable tension.
Why is my horizontal track sagging?
Loose or weak hangers, missing braces or weight hung on the track. DASMA says sagging track should be stiffened with angle braces or back hangs.
Can I hang bikes from my garage door track?
No. DASMA advises against attaching or hanging materials from any part of the door assembly.
What is a center track?
An extra track that helps stop very wide or heavy doors sagging when open, as DASMA describes.
How long is the horizontal track?
Long enough for the open door plus the curve; Clopay lists backroom of door height plus 16 to 18 inches for standard track.
Do inspectors check horizontal track?
Yes. DASMA’s code checklist checks horizontal tracks are securely connected to load-bearing members.
What is follow-the-roof track?
Contour track, in DASMA’s terms, is horizontal track bent to follow a sloped ceiling.
Does a wall-mount opener affect horizontal track?
It can. DASMA notes jackshaft openers need good cable tension and that sagging or twisting horizontal track should be stiffened with angle braces or back hangs.
Can horizontal track be fastened to drywall?
No. Hangers must go into ceiling framing; DASMA publishes guidance on drywall surfaces and mounting hardware for this reason.
Why do rollers come out at the back of the track?
Sagging track, a loose hanger or a bent stop. Do not operate it until a technician has checked it.
Sources
- DASMA Technical Data Sheet #160, Sectional Garage Door Terminology, retrieved .
- Clopay, Residential Garage Door Track Options: headroom, sideroom and backroom specs, retrieved .
- DASMA Technical Data Sheet #151, General Code Inspection Guidelines for Sectional Garage Doors, retrieved .
- DASMA Technical Data Sheet #174, Building Occupant: Checking a Residential Sectional Garage Door for Damage, retrieved .
- DASMA Technical Data Sheet #181, General Code Inspection Guidelines for Wind Load, retrieved .
- DASMA Technical Data Sheet #190, Factors Affecting Spring Cycle Life, retrieved .
- DASMA Technical Data Sheet #1501, Standard Lift Garage Doors with Jackshaft Operation, retrieved .
- DASMA, Technical Data Sheets (index), retrieved .
Expert review
Written by the HyreGarage Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Definitions from DASMA TDS-160; inspection from TDS-151, 174 and 181; sag guidance from TDS-1501; storage warning from TDS-190; backroom from Clopay.
Suggest a correction. We fix errors and say what changed.