Quick answer
A garage door header is the horizontal framing member across the top of a garage door opening that carries the wall or roof above and provides the mounting surface for the spring assembly and opener bracket.
DASMA uses “door header” for the upper part of the door frame, including the head jamb and trim, and “lintel” for a member that spans and carries the load above an opening. Its strength is the builder’s responsibility.
Quick facts
The key facts about Garage Door Header, with sources:
- DASMA “door header”
- Upper part of the door frame: head jamb, head casing, stop and trim 1
- Lintel
- Horizontal member spanning and carrying the load above an opening 1
- Spring pad minimum (wood)
- 2x6 recommended when a separate pad is installed 2
- Responsibility
- Supporting structure belongs to the builder, not the door installer 7
- Wind posts
- Vertical posts can increase the load on the header 5
Key takeaways
- The header spans the top of the opening and carries the structure above it.
- Garage door springs and the opener’s header bracket fasten to it.
- It must be solid wood or proper framing, never just drywall.
- Sizing the header is a builder and code question, not a door question.
- Cracks, sagging or loose spring hardware on the header mean stop and call.
What the header is
Two different things get called the header. Structurally, it is the beam over the opening that carries the wall, floor or roof above.
DASMA calls that a lintel: a horizontal member spanning and carrying the load above an opening 1.
In door terms, DASMA defines the door header as the upper part of a door frame, made up of the head jamb, head casing, stop and trim molding 1.
For a garage door, both matter. The structural beam holds up the house. The wood face fastened to it, which DASMA’s framing guide calls the horizontal back jamb, is where the door’s hardware mounts 2.
DASMA’s guide lists the four things that framing must support: the weight of the door, track and springs; torque from the counterbalance system; wind load forces; and vibration from door operation 2.
What the header carries for the door
On a torsion spring door, the center bearing bracket and the springs’ stationary cones anchor to the header through a spring pad.
DASMA defines the spring pad as a pad installed on the header above the door to anchor the center bearing bracket, which can sit off-center depending on spring size 1. Every inch-pound of spring torque pushes against that pad.
A trolley opener’s header bracket also fastens there. The Genie installation poster says the header bracket must be fastened to garage framing and not to drywall, particle board or plaster, and places it 2-1/2 inches above the door’s highest point of travel 9.
In storms, the header takes wind load too. DASMA notes that vertical reinforcement posts transmit wind load to the header and floor and may increase the force on the header, so a design professional should assess the structure before posts are installed 5.
Header-related terms
| Term | Meaning (DASMA) |
|---|---|
| Door header | Upper part of a door frame: head jamb, casing, stop, trim 1 |
| Lintel | Member spanning and carrying the load above an opening 1 |
| Horizontal back jamb | Wood mounting member across the top, inside 2 |
| Spring pad | Pad on the header anchoring the center bracket 1 |
| Header seal | Weatherstrip at the header 1 |
| Drip cap | Projection over the head of an opening to throw water clear 1 |
Example: DASMA’s framing checks at the header
Items from DASMA’s wood back jamb guidelines for existing construction 2.
| Check | Pass if |
|---|---|
| Horizontal jamb attachment | Firmly attached to the building frame |
| Wood condition | Solid, not decayed |
| Geometry | Level, square and flush with the jambs |
| Spring pad (new) | Sound wood, no cracks, splits or knots at fasteners |
| Spring pad size | 2x6 minimum when separate; large doors may need more than one |
- No sagging along the top of the opening
- No cracks around the spring pad
- Center bracket tight to the wood
- Opener bracket into wood, not drywall
- No rot or water stains
- Header seal intact
DASMA adds that the local building official is the sole and final determiner of suitability, and that large commercial doors may need more support 2.
Where to look
Inside the garage, look at the wall right above the door. On a torsion door you will see the bar and springs mounted on a wood pad there, and usually the opener’s header bracket near the center. Outside, the header is hidden behind trim and siding above the door.
In finished garages, drywall may cover the framing. DASMA’s guidance on drywall says that, if possible, door hardware should not be mounted to drywall at all; cut it away or fasten a wood buck over it into the framing 4.
Drywall and hidden framing
Hardware mounted only into drywall can pull out under spring torque or opener force.
DASMA recommends either a wood member fastened over the drywall into the framing, with longer fasteners to pass through the drywall, or lag screws long enough to embed in the wood behind it, located with a stud finder 4.
For the header specifically, DASMA describes fastening a 2x4 or larger member so the mounting surface is flush 4.
If you are finishing a garage, tell the drywall installer where the door hardware mounts, or leave those areas as exposed wood.
Fasteners that hold door hardware to the header
How hardware is attached matters as much as the wood. DASMA’s frame connection guide lists fastener types for attaching jambs to framing, including lag screws, sleeve and expansion anchors in masonry, L-bolts, common nails, self-tapping screws into steel and fillet welds, and provides spacing schedules by door width and wind load 3.
It recommends professional engineering advice for attachment in wind-load situations 3.
In concrete or masonry walls, DASMA warns installers to locate reinforcing steel and not drill through or damage it, and to consult a structural engineer if jamb fasteners would interfere with it 3.
On wood framing, DASMA’s back-jamb guide says spring pads must be free of cracks, splits and knots where fasteners go 2.
For owners, the practical sign is simple: hardware should be tight, flush against sound wood, with no cracks radiating from the screws.
Keeping water off the header
Rot is the main enemy of wood headers. Water runs down the wall and in at the top of the door if trim and flashing fail.
DASMA defines a drip cap as a projection over the head of a door opening that throws water clear of the building 1, and a header seal as weatherstripping at the opening header 1. Both protect the framing.
Look for peeling paint, dark stains or soft wood at the top corners of the opening, inside and out. Catching rot early keeps a small carpentry job from becoming a structural one.
A sound header vs a weak one
What the door installer is not responsible for
DASMA states that garage door manufacturers and installers are not responsible for the supporting structure’s ability to resist wind loads; that is the general contractor’s responsibility, and doubts should be resolved with the contractor, architect or building official 7. DASMA’s code checklist for wind-rated doors repeats it 8.
So a door installer may refuse to hang hardware on a damaged header and send you to a builder first. That is normal, and it protects you: hardware fastened to framing that cannot hold it is a hazard however well the door itself is made.
What drives header-related cost
No prices on this page. See the cost guide.
- New spring pad or wood buck over drywall 4.
- Rot repair at the header and jambs.
- Structural header replacement by a builder, often with a permit.
- Widening an opening, which means a new, longer header.
How header problems are fixed
- A door technician inspects the header and spring pad 2.
- If the structure is in doubt, a builder or design professional assesses it 2.
- Framing is repaired or replaced to code, with a permit where required.
- New spring pad and backing are installed level and flush 2.
- The door hardware is remounted with proper fasteners 3.
Owner care
- Keep the top of the door sealed so water does not reach the header 1.
- Watch for stains, soft wood or peeling paint above the door.
- Look for gaps behind the center spring bracket.
- Ask about the header at yearly door service.
Warning signs
Cracks in the spring pad, a center bracket pulling from the wall, a sagging top edge on the opening, doors that bind at the top, or water damage above the door.
Do not tighten or remove spring brackets. DASMA warns not to adjust springs or anything they are fastened to, such as wood blocks or steel brackets 6.
A loose spring pad is an emergency
If the wood block holding the springs is splitting or pulling away, keep everyone clear and call a technician. That block holds the full spring torque 6.
Rules
Header sizing follows the building code your area has adopted and is the builder’s responsibility 7. DASMA’s framing guides (TDS-156, 161 and 164) cover mounting surfaces and fasteners for door hardware 2 3 4. The local building official is the final authority 2.
Header vs related framing
| Part | Where |
|---|---|
| Header | Across the top of the opening |
| Jamb | Sides of the opening 1 |
| Rough opening | The framed hole the door fills |
| Headroom | Space above the header |
| Torsion shaft | Mounted on the header 1 |
Myths
Wind zones
What to do
If the header looks sound, nothing. If you see cracks, rot or loose spring hardware, call a door technician, who will bring in a builder if the structure is involved. Planning to widen the opening? Talk to a builder first.
Mark the framing before drywall
Finishing your garage? Photograph the framing above the door before drywall goes up so future installers can find solid wood.
Questions about Garage Door Header
What is a garage door header?
The framing across the top of the opening that carries the structure above and provides the mounting surface for springs and the opener bracket.
What holds the garage door springs?
On torsion doors, a center bearing bracket fastened to a spring pad on the header, per DASMA.
Can garage door hardware be mounted to drywall?
Avoid it if you can. DASMA advises cutting the drywall away or fastening a wood buck into the framing.
Who is responsible for the header’s strength?
The general contractor. DASMA places the supporting structure outside the door maker’s and installer’s responsibility.
What size spring pad is needed?
DASMA recommends at least a 2x6 when a separate wood pad is installed; large doors may need more than one.
What is a lintel?
A horizontal member that spans an opening and carries the load above it (DASMA’s definition).
Why is my garage door binding at the top?
A sagging header, a misadjusted opener or thermal bowing can cause it. Have a technician check.
Do hurricane posts affect the header?
Yes. DASMA says vertical posts transmit wind load to the header and may increase it, so the structure should be assessed.
Where does the opener header bracket go?
Into framing above the door; Genie places it 2-1/2 inches above the door’s highest point of travel.
How are spring brackets fastened in a masonry wall?
With masonry anchors or bolts chosen from schedules such as DASMA TDS-161. DASMA warns not to drill through reinforcing steel and to involve an engineer if fasteners would hit it.
Why is the wood above my garage door rotting?
Water getting past trim, flashing or the header seal. DASMA lists drip caps and header seals as the parts that keep water off; fix the source before replacing wood.
Can I widen my garage door opening?
It requires a new, longer header and usually a permit. Talk to a builder before ordering a wider door.
Sources
- DASMA Technical Data Sheet #160, Sectional Garage Door Terminology, retrieved .
- DASMA Technical Data Sheet #156, Wood Horizontal and Vertical Back Jamb Detail Guidelines, retrieved .
- DASMA Technical Data Sheet #161, Connecting Garage Door Jambs to Building Framing, retrieved .
- DASMA Technical Data Sheet #164, Drywall Surfaces and the Mounting of Garage Door Hardware, retrieved .
- DASMA Technical Data Sheet #153, Vertically Reinforcing Sectional Garage Doors for Wind Load Conditions, retrieved .
- DASMA Technical Data Sheet #167, Residential Sectional Garage Door and Electric Operator Checklist for Home Inspectors and Consumers, retrieved .
- DASMA Technical Data Sheet #168, Wind Loads on Garage Doors: FAQ, retrieved .
- DASMA Technical Data Sheet #181, General Code Inspection Guidelines for Wind Load, retrieved .
- The Genie Company, Chain/Belt Drive Opener Assembly & Installation poster (38968503812, 03/2018), 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; framing guidance from TDS-156, 161 and 164; responsibility from TDS-168 and 181; wind posts from TDS-153; opener bracket from the Genie poster.
Suggest a correction. We fix errors and say what changed.