Doors & Openings
Sliding Doors for Pre-Engineered Steel Buildings
Definition: A sliding door for a pre-engineered building is a steel-framed, panel-clad door leaf that hangs from an overhead track and slides along the wall face to open. Single-leaf and bi-parting versions are common on barns, hangars, workshops and storage buildings where large openings are needed at low cost.
Key facts
- The door leaf is a light steel frame clad with the same panel as the walls.
- Bi-parting doors use two leaves that open from the center to reduce the parking length on each side.
- The track and header must be designed for the door weight and wind loads.
- The wall beside the opening must be clear of downspouts and bracing for the open leaf.
- Sliding doors suit very wide openings where rolling doors would be heavy or costly.
Role in the structure
The sliding door hangs its weight on trolleys running in a header track, which is fixed to a header beam or the eave strut. Wind pressure on the leaf is shared between the track at the top and floor guides or stay rollers at the bottom. When open, the leaf parks against the adjacent wall, so the wall framing beside the opening must provide a flat surface and support for the track extension.
Single, bi-parting and multi-leaf sliding doors
A single-leaf sliding door is the simplest arrangement and needs wall space on one side equal to the opening width. Bi-parting doors split the opening into two leaves moving in opposite directions, halving the parking length on each side. For very wide openings such as aircraft hangars, multi-leaf doors on parallel tracks stack together when open.
The choice depends on opening width, available wall space, frequency of use and the level of weather sealing needed. Sliding doors are generally less airtight than rolling or sectional doors, so they suit unconditioned buildings better than heated or cooled spaces.
How the door is supported by the building frame
The leaf hangs from trolleys in a header track. The track is bolted to a header member or eave strut that spans across the opening and beyond it to support the parked leaf. This member carries the door weight and must be stiff enough that the track stays level.
At the bottom, guides or rollers keep the leaf close to the wall and resist wind. In high wind areas, additional stays or keeper brackets hold the leaf against suction. The project engineer confirms the size of the header and jambs to the governing code.
Sealing and weather protection
A rain hood over the track protects trolleys from water and debris. Jamb and bottom seals, and an overlap between bi-parting leaves, reduce wind-driven rain entry. For dusty sites, brush seals may be added.
Because the door slides in front of the wall, the wall panels behind the parked leaf should be smooth and free of projecting fixings or trims. Downspouts, lights and signs should be positioned away from the door path.
Materials & coatings
- Cold-formed steel door frame with diagonal or rigid corner bracing.
- Profiled wall sheeting on the leaf, usually matching the building walls.
- Galvanized steel box or channel track with ball-bearing trolleys.
- Bottom guides, stay rollers, latch hardware and weather seals.
Design considerations
- Opening width and height and the wall length needed to park the leaf.
- Door weight and the stiffness of the header supporting the track.
- Wind pressure on the leaf and the bottom restraint required.
- Clearance from downspouts, bracing, columns and wall-mounted items.
- Security, locking and whether a personnel door is set into the leaf.
Fabrication
- Door frames are cut, welded or bolted and coated before cladding.
- Leaves may be shipped assembled for small doors or as kits for large doors.
- Track, header and hardware are supplied with the door and marked by opening.
Erection
- Install the header and track level along the full travel length.
- Hang the leaves on trolleys and adjust them to clear the floor evenly.
- Fit bottom guides, stops, latches and seals, then test opening and closing.
- Install the rain hood and check that water drains away from the track.
Inspection & quality
- Confirm the track is level and the leaf slides freely along its full travel.
- Check stops prevent the leaf from leaving the track.
- Verify guides and stays hold the leaf against the wall under hand pressure.
- Check seals and latches function and the cladding fixings are secure.
What to include in your RFQ
- Opening size and location, and single or bi-parting arrangement.
- Direction of opening and the wall area available for the parked leaf.
- Cladding profile and color for the leaf.
- Locking hardware and any wicket door in the leaf.
- Wind exposure and design wind pressure.
3D model & IFC of this component
Rotate the model, isolate the component and download its IFC4 file for your BIM coordination model.
IFC entity: IfcDoor. Illustrative geometry for coordination and learning. Final member sizes come from the project design.
Frequently Asked Questions
Are sliding doors cheaper than roll-up doors?
For wide openings in unconditioned buildings they are often more economical, because the leaf is a simple framed panel. Their weather sealing is lower, so they suit barns and storage more than conditioned spaces.
Can a personnel door be included in a sliding door?
Yes. A wicket door can be framed into one leaf so people can enter without opening the whole door.
Do sliding doors work in high wind areas?
They can, provided the track, header, bottom guides and stays are designed for the site wind pressure. The engineer confirms the arrangement for each project.
Engineering content is general guidance. Every World Steel building is designed by qualified engineers to the code and loads of the project.
