Aluminium Bi-Fold Door Panel Sequencing: Hinges, Guides, Locks and Installation QA

Aluminium Bi-Fold Door Panel Sequencing: Hinges, Guides, Locks and Installation QA

An aluminium bi-fold door is not a collection of interchangeable panels. It is a coordinated operating system in which panel order, hinge positions, carrier hardware, guides, locks, seals, threshold details and surrounding construction must work together. A door can appear square and attractive while still binding, leaking air, shedding water into the room or failing to achieve the security and safety outcome required by its project documentation. Panel sequencing therefore belongs in design review, shop-drawing review, installation inspection and commissioning, not only in the final handover checklist.

This guide is a practical quality-assurance framework for specifying and installing aluminium bi-fold doors. It does not replace the selected manufacturer’s technical manual, tested assembly, engineering advice, building approval or the requirements of the project. Bi-fold systems differ substantially. Some are top-hung, some are bottom-rolling, and some transfer weight through a combination of carriers and guides. Panel counts, maximum panel sizes, stack arrangements, handing, hardware loads, drainage paths and permissible adjustments are system-specific. The installer must use the instructions for the exact system, profile series, hardware set and glass configuration.

Start with the opening, the system and the operating brief

Before panels are ordered, record the opening width and height as site conditions actually provide them, together with the required finished floor level, sill condition, head support, jamb conditions and surrounding waterproofing. Confirm whether the opening is new construction, a replacement opening or an alteration to an existing wall. A replacement may involve concealed damage, non-level floors, old flashings or a wall that is no longer plumb. Those conditions can change the appropriate installation method even when the nominal opening size looks unchanged.

The operating brief should state how the door is expected to move. Identify the primary access leaf, the direction in which panels fold, the side on which the stack parks, whether the door opens inward or outward, and whether the user expects one-way or two-way operation. Record whether panels must fold into a reveal, against a wall, behind a return or into a protected stack zone. Check that furniture, curtains, screens, balustrades, steps, light switches, downpipes and adjacent doors do not obstruct the travel path.

Handing is not merely a drawing convention. Reversing a stack can move the active leaf, change lock access, alter the load path and place hinges or handles on the wrong faces. The signed shop drawing should therefore show the interior and exterior elevations, panel numbers, fold direction, stack location, active leaf, handle positions, lock positions, sill or threshold, drainage direction and any fixed panel. Do not accept a drawing that shows only an overall rectangle without an operating sequence.

Confirm system-specific limits before design approval

Ask the system supplier or manufacturer to confirm, in writing, the permitted panel count, panel width and height ranges, panel mass limits, glass make-up limits, carrier arrangement, maximum stack configuration and any restrictions on opening direction. Do not infer those limits from a different product in the same catalogue. A hinged bi-fold system, a lift-and-slide system and a top-hung folding system may use similar aluminium finishes but have different permissible loads and adjustment methods.

Confirm whether the selected assembly has been tested for the intended exposure, water penetration, air infiltration, structural performance, operation and safety-glazing configuration. A laboratory result belongs to a defined specimen and test arrangement. It is not automatically evidence that every panel count, glass thickness, threshold, corner condition, hardware option or installation variation has the same performance. This factual boundary should be clear in the project record.

Panel order and sequencing

Number panels from the nominated reference jamb, using a consistent convention such as P1, P2, P3 and so on. State whether the numbering is viewed from inside or outside. This avoids the common error in which an outside elevation is read as an inside elevation and the panels are assembled in reverse. Mark the first panel, last panel, active access leaf, intermediate panels and any fixed or hinged starter panel. Include arrows showing folding direction rather than relying on text such as “left stack”.

A typical sequence may begin with a fixed or hinged lead panel at one jamb, followed by intermediate folding panels and an active access leaf. Another system may use a lead panel that carries the lock or a traffic door that opens independently before the remaining panels fold. These arrangements are not interchangeable. The exact first and last panel are determined by the hardware geometry, carrier positions, hinge handing and the manufacturer’s sequence. If the system has a designated traffic leaf, treat it as a controlled component, not as an arbitrary choice made during installation.

Before glazing or final assembly, lay out the panels in order on padded supports. Check profile labels, pre-machined holes, hinge leaves, carrier brackets, glazing beads, drainage slots, lock preparations and handle preparations. Compare every panel to the approved elevation. A panel that looks visually identical may have a different hinge preparation or drainage path. Photograph the layout and retain the record where the project quality plan requires traceability.

Sequence the moving loads, not only the appearance

Panel sequencing must follow the intended load path. In a top-hung system, the head track, carriers and supporting structure transfer substantial operational loads; the floor guide may control alignment rather than carry the full panel weight. In a bottom-rolling system, the sill track, rollers and supporting floor or sub-sill are central to performance, while the head guide controls lateral movement. In a hybrid arrangement, both head and sill hardware can be important. Never assume that a visible roller proves that the door is bottom-supported, or that a head carrier permits the head to be fixed to an unsupported lining.

When the panels are folded, loads and clearances change. The stack may project farther than the closed door line, and a panel may approach a jamb, wall return or adjacent glazing. Check movement through the complete travel path, including the last part of the fold. A door that works when opened halfway but collides at the parked position has not been commissioned successfully.

Hinges, carriers, rollers and guides

Hinges must be installed in the specified positions and orientation. They control the fold axis, maintain alignment between panels and can affect the clearance at meeting stiles. Do not substitute general-purpose hinges for the specified hardware. Check that hinge fasteners engage the intended reinforcement or fixing zone and that fastener heads do not interfere with seals, beads or moving hardware. The manufacturer’s recommended fastener type, spacing and edge distances apply to the chosen profile and substrate; this guide does not invent universal dimensions.

Inspect carriers and rollers for correct handedness, bearing condition, retaining devices and adjustment access. Rollers should run on a clean, continuous and properly supported track. Guides should be aligned with the track and should not be forced sideways to compensate for a crooked opening. Remove swarf, mortar, adhesive and protective-film residue before operation. Debris can damage rollers, block drainage or create a false impression that a panel is out of adjustment.

Fix the head track or sill track to structure that is capable of resisting the loads identified by the system documentation. Packings must be stable, compatible with the installation method and arranged so they do not crush, bridge drainage paths or leave unsupported spans. A neat bead of sealant cannot substitute for structural fixing or correct packer support. Where the head is supported by a lintel or engineered framing, the interface must allow the door frame to remain within the manufacturer’s tolerances after expected building movement.

Check movement at every stage

Test the frame before panels are hung, then test each panel as it is added. The purpose is to isolate errors. If resistance begins when a particular panel is installed, inspect that panel’s hinge, carrier, guide, gasket and frame contact before adding more hardware. With all panels installed, operate the door slowly from fully closed to fully open and back again. Observe whether rollers lift, guides bind, meeting stiles twist, seals roll out or handles strike adjacent panels.

Locks, handles and access leaves

Confirm which panel carries the primary lock, which panel is the active leaf and how intermediate panels are secured. Multipoint locks, shoot bolts, flush bolts and captive handles are system-specific. Locking should be possible only when panels are correctly aligned; users should not need to lift, force or slam the door. If the design requires a sequence such as closing intermediate panels before operating the traffic leaf, provide clear operating instructions and ensure the hardware prevents misleading partial engagement.

Handles must have sufficient clearance from adjacent stiles, walls, reveals and fixed objects. Check operation with the door both closed and partly folded. Confirm that the handle height and grip are appropriate to the project brief and that any accessibility, egress or child-safety requirement has been addressed by the responsible designer. Do not describe a handle as compliant merely because it is a particular shape. Compliance depends on the applicable project requirements, installation and use conditions.

Where a door forms part of an exit route or a required accessible path, obtain the relevant design advice before selecting locks or thresholds. A lock that is secure in a residential setting may be unsuitable for a required means of egress. A traffic leaf that requires a key, excessive force or a special sequence may conflict with the intended use. Record the design decision rather than relying on an installer assumption.

Seals, thresholds, drainage and water management

Install perimeter seals, inter-panel gaskets, meeting-stile seals, glazing gaskets and threshold components exactly as specified. Seals must be continuous where the system requires continuity, seated in their grooves, free from cuts and not stretched during installation. At corners, use the manufacturer’s corner treatment. Do not casually trim a gasket at a drainage opening or block a weep because it appears untidy.

Threshold selection affects weather performance, accessibility, drainage and operating clearance. Identify whether the threshold is recessed, low-profile, ramped, standard, drained or designed for a particular sill pan. A low threshold is not automatically suitable for an exposed opening. A raised threshold is not automatically a waterproofing solution. The external paving, deck, balcony or landing must preserve the intended fall and drainage strategy, and the junction with the wall must be detailed by the project designer.

Trace the water path from the outer face through the frame. Water that enters a drainage chamber must have a clear route to the exterior. Check sill end dams, sill pan interfaces, weep outlets, sub-sill drainage, jamb closures and sealant junctions. Keep weep holes open after rendering, tiling, painting and paving. Do not drill new holes or fill existing holes without system-specific instructions. A drainage detail that works in a test specimen can be defeated by an unsealed fixing, a blocked outlet or an external surface that sits too high.

For exposed sites, confirm wind, rain, coastal, corrosive, bushfire and thermal-movement considerations with the project team. Aluminium alloy, finish, fasteners, sealants, flashings and adjacent materials must be compatible with the environment. AS 4666 should be considered where the project identifies a bushfire-related scope, but bushfire compliance is not established by naming the standard alone. The relevant construction provisions, site exposure, tested details and approval requirements must be checked together.

Glazing and safety requirements

Glass selection and installation require a separate check from panel sequencing. AS 1288, Glass in buildings—Selection and installation, is a key Australian reference for selecting and installing glass in locations where human impact, wind loads, support conditions and other hazards must be considered. AS 2208, Safety glazing materials in buildings, addresses safety glazing material requirements and testing. The exact edition and any adopted regulatory variation should be confirmed for the project.

Do not invent glass thickness, safety-glass markings, impact classification or acoustic and thermal performance. Confirm the glass make-up, marking and compliance evidence for the selected door system, opening size and location. Glazing blocks, setting blocks, packers and clearances must follow the glass and system instructions. Glass must not be forced into a distorted panel, and a bead or gasket must not be used to conceal an incorrect glass size.

In Australia, AS 2047, Windows and external glazed doors in buildings, may apply to the performance and installation of windows and external glazed doors, subject to the building type, climate, scope and applicable regulatory provisions. A door’s compliance cannot be assumed from a product name. Check the manufacturer’s evidence for the exact configuration and document any exclusions. In New Zealand, the relevant New Zealand Building Code provisions and applicable NZS 4223 guidance should be reviewed for glazing selection and installation, alongside the system supplier’s requirements.

Shop drawings and installation quality assurance

A useful shop drawing includes plan, elevation and section views; panel numbers; viewing direction; handing; opening direction; stack dimensions; hinge and carrier positions; lock and handle locations; glass make-up; threshold; sill pan; drainage arrows; head support; fixing zones; sealant interfaces; tolerances; and interfaces with adjacent finishes. It should identify details that are standard to the system and details that are project-specific. Approval of a drawing is not approval to change the tested assembly without technical review.

At delivery, inspect packaging, frame members, panels, glass and hardware for transport damage. Confirm that labels and hardware match the approved schedule. Before installation, verify opening dimensions and substrate condition. During installation, record frame plumb, level, square, diagonal consistency, fixing, packing, sealant, drainage and protection. Use the system’s stated tolerances rather than publishing generic numbers that may not apply.

Hold points for inspection

Pre-installation: approved drawings, system instructions, panel schedule, glass schedule, opening condition and supporting structure confirmed.
Frame installation: track, sill, head, jambs, packers, fixings, flashings, sealants and drainage inspected before concealment.
Panel assembly: panel order, hinge handing, carriers, rollers, guides, seals and retaining devices checked against the schedule.
Glazing: glass identity, safety-glazing evidence, blocks, gaskets, beads and damage inspection recorded.
Pre-finish operation: all panels travel without abnormal force, collision, scraping, twist or seal displacement.
Final commissioning: locks, handles, bolts, drainage outlets, clearances, operating instructions, cleaning and maintenance information verified.

Operating clearances and commissioning

Measure and observe clearances at closed meeting stiles, hinges, handles, jambs, threshold transitions and the folded stack. The required clearance is system-specific and may vary with temperature, seal type, panel mass and frame tolerances. The correct test is not whether a credit card fits a gap or whether the door can be made to move by force. The correct test is whether the installed assembly operates as intended without damaging itself or creating a hazard.

Commission the door in the order described by the manufacturer. Normally this includes releasing protective restraints, checking carriers or rollers, adjusting alignment, checking lock engagement, confirming seal contact and verifying drainage. Adjust only the permitted points. Do not file a hinge, enlarge a track slot, remove a seal or move a lock strike as an improvised fix unless the system documentation or responsible technical representative authorises it.

Record the final stack position, active leaf, opening direction and any limitations. Give occupants simple instructions: do not drag panels by the glass, do not force a lock when the panels are misaligned, keep tracks and drainage paths clear, and close the door before engaging bolts. If wind can move panels, provide the specified hold-open or restraint solution. A temporary wedge or unapproved hook is not a permanent safety device.

Maintenance and safety

Maintenance frequency depends on exposure, usage, contamination, salt, dust and the system instructions. Keep tracks, guides, weeps and sill channels free of grit and construction debris. Clean aluminium and glass with compatible products. Inspect seals for shrinkage, cuts, hardening or displacement. Check handles, locks, shoot bolts, hinge screws, carriers, rollers, retainers and fixings for looseness or damage. A lubricant should be used only where the manufacturer permits it; some lubricants attract dust or damage seals.

Arrange professional inspection if the door becomes difficult to move, drops, scrapes, leaks, rattles, fails to lock, shows cracked glass or develops a loose panel. Stop using a panel that is unstable or cannot be restrained safely. Do not attempt to remove a glazed panel without the required equipment and competent personnel. Large glass panels can be heavy and fragile even when the door appears lightweight.

AS 4666 may be relevant to the protection of buildings from external attack by bushfire where the project is in scope; it does not replace the bushfire construction provisions, site assessment or approval pathway. AS 2047 and AS 1288 are not general guarantees for every installation, and AS 2208 does not by itself prove that an entire door assembly is compliant. These distinctions should appear in the handover record so that future maintenance does not treat a standard reference as a blanket product warranty.

Relevant Australian and New Zealand references

NCC and ABCB: Use the applicable edition of the National Construction Code and Australian Building Codes Board guidance for the building classification, weatherproofing, safety glazing, access, egress, energy, condensation and bushfire provisions that apply to the project. The NCC is regulatory context; it does not replace the selected system’s installation instructions.
AS 2047: Windows and external glazed doors in buildings. Check applicability, performance requirements, test evidence and configuration limits for the actual door assembly.
AS 1288: Glass in buildings—Selection and installation. Use it for the relevant Australian glass selection and installation checks, including human-impact locations and support conditions.
AS 2208: Safety glazing materials in buildings. Confirm that safety glazing materials and markings are appropriate to the project and supported by evidence.
AS 4666: Protection of buildings from external attack by bushfire. Apply only where the project scope and approval documents identify bushfire-related requirements; confirm the current edition and interaction with other bushfire standards and regulations.
New Zealand guidance: Review the New Zealand Building Code provisions and current applicable NZS 4223 guidance for glazing in buildings, together with the system supplier’s New Zealand installation and compliance information. Confirm whether other project-specific New Zealand standards, producer statements or council requirements apply.

Frequently asked questions

Can panels be numbered from either side?

They can be numbered from either side if the drawing clearly states the viewing direction and uses that convention consistently. The safest record identifies inside and outside elevations, stack side, active leaf and fold arrows. Never rely on a panel number without its reference direction.

Can I reverse the opening direction after delivery?

Do not assume that reversal is possible. Handing may affect hinges, carriers, locks, seals, machining and the tested configuration. Obtain written confirmation from the system supplier before changing the opening direction, and revise the shop drawing and hardware schedule.

Why does a door bind after the panels are glazed?

Glazing adds mass and can reveal frame distortion, incorrect blocks, track misalignment, incorrect hinge handing or inadequate support. Check the panel order, glass identity, setting blocks, carriers, guides and frame tolerances systematically. Do not force the door or remove seals as a first response.

Is a low threshold always better?

No. A low threshold can assist access but may have different drainage, weather-exposure and structural requirements. The selected threshold must suit the system, opening exposure, finished floor levels, waterproofing detail and project access requirements.

Can I drill extra drainage holes?

Not without system-specific approval. Extra holes can weaken profiles, bypass drainage chambers or invalidate tested details. First identify why drainage is inadequate and refer the issue to the manufacturer or responsible designer.

Does a standard reference guarantee the installed door?

No. Standards have defined scopes, editions, test methods and applicability. Compliance depends on the actual product, configuration, installation, substrate, exposure and regulatory pathway. Keep the manufacturer’s evidence and the installation records with the project handover documents.

What should the owner receive at handover?

Provide the approved panel schedule, operating direction, system instructions, cleaning and maintenance guidance, warranty information issued by the responsible supplier, glass and safety-glazing records where applicable, commissioning results, adjustment limits, emergency contact details and any documented restrictions. Explain the operating sequence in person when practical.

Conclusion

Reliable aluminium bi-fold doors begin with a documented operating sequence. Confirm the opening direction and stack side, number every panel from a stated reference, match hinges and carriers to the exact system, support tracks correctly, protect seals and drainage, select glazing under the applicable guidance, and inspect operation through the entire folding path. Treat locks, handles, thresholds and clearances as coordinated components rather than late-stage accessories. Finally, commission the door, record its limitations and give the owner a maintenance routine. The result should be a door that is not only visually aligned, but also traceable, serviceable and appropriate to the system-specific performance and safety requirements of its installation.