A big opening eats standard high speed doors twice. Buy a conventional roll-up model for a wide exterior wall and the first real storm can push the middle of the curtain out of its guides. The door then sits dead until a technician arrives. Go taller instead, and the coil barrel that stores the curtain swells until the roof steel simply has no room left for it.
Our factory has engineered industrial doors since 1999, and the current high speed range runs 21 models with curtain speeds from 0.8 to 2.5 m/s. We build roll-up, folding and stacking doors side by side. Our published stacking door data covers openings above 10,000 mm wide and 8,000 mm high at a Class 3 wind rating. This page explains what high speed PVC stacking doors are, how the stacking mechanism differs from coiling and folding, and where each structure earns its keep.
How a PVC Stacking High Speed Door Works
A high speed stacking door stores its curtain overhead in flat folds rather than around a barrel. High-tensile lifting belts anchored to the bottom edge pull the curtain upward, and horizontal wind bars locked into curtain pockets keep each section straight as it rises. The sections fold over one another and stack in a compact pack above the header, which is how the design reaches widths and heights that defeat coiling curtains.
Drive duty comes from a servo motor with a frequency converter, so acceleration stays smooth across a curtain that can weigh several hundred kilograms. On our stacking line the curtain opens at up to 1.5 m/s and closes at up to 1.0 m/s, both adjustable in the PLC controller. Safety hardware follows EN 12453, with force limiting plus photoelectric sensors and optional light curtains across the threshold. The selection view ends where the movement begins: how a high speed stacking door works, step by step from signal to seated fold pack.
Three Ways to Store a Door Curtain
Every flexible high speed door solves the same problem: where does the curtain go when the door is open? High speed PVC stacking doors answer it with an overhead fold pack, coiling doors answer it with a barrel, and the roll-up comparison turns on exactly this storage step. The storage choice decides headroom, side room and wind rating all at once.
| Storage mechanism | Open position | What grows as the door gets bigger | Natural habitat |
|---|---|---|---|
| Coiling (roll-up) | Wrapped around a barrel | Barrel diameter, so headroom demand climbs with door height | Internal traffic doors up to large single spans |
| Folding | Horizontal folds pushed to the sides | Side room beside the opening | Wide internal openings with spare wall |
| Stacking | Vertical folds stacked above the header | Almost nothing: the pack depth is set by fold count, not door height | Large, wind-exposed, high-cycle openings |
The stacking pack deserves the geometric point spelled out. A coiling curtain adds one wrap of thickness per revolution, so the barrel diameter and its headroom requirement grow with every meter of extra door height. A stacking curtain is divided into a chosen number of folds instead. The finished pack height follows the fold count and curtain thickness, so it stays close to constant even as the door climbs toward eight meters.
Wind Bars Carry the Load to the Guides
Wind resistance on a soft curtain is a load-path story. Pressure on the curtain face passes into the horizontal bars. The bars pass it into the side guides, and the guides pass it into the building steel through welded or heavy-anchor fixings. That chain is what lets a PVC curtain hold a large span flat in a gust instead of billowing out of the tracks.
Watch the wind class arithmetic
EN 12424 grades wind resistance from Class 0 to Class 5, and Class 3 corresponds to 700 N/m². At least one supplier card advertises a “Class 8” stacking door, a level the standard does not define. Ask any bidder for the test pressure in N/m² and the test report, not the class number alone.
Our stacking doors are rated Class 3 (700 N/m²) under EN 12424, which covers most semi-sheltered and exposed industrial walls, and reinforced builds exist for harsher coastal sites. The curtain itself is typically 0.8 to 1.2 mm high-density PVC with UV stabilisers. The grade is chosen for the site as part of the curtain materials specification rather than as an afterthought.
Opening Sizes Other High Speed Doors Refuse
Coverage is why plants accept a slower stacking door. Standard roll-up curtains fight the sail effect as spans grow, while rigid doors get heavy and slow at extreme sizes. Openings beyond roughly six meters wide or tall start eliminating candidates fast. That is exactly the range where high speed PVC stacking doors live, engineered between 6 and 20 meters wide across mining plants, shipyard booths and aircraft hangars.
Our own engineering envelope runs past 10,000 mm in width and 8,000 mm in height on a single custom curtain, one door at a time with no minimum order quantity. Each project is checked against the real wind zone, traffic pattern and activation method. The deployments behind those checks read like a tour of stacking door applications, from coastal ports to inland workshops.
Activation choices follow the traffic, not the catalog. Radar sensors suit mixed forklift and pedestrian lanes that cannot wait for a button. Induction loops handle truck routes where metal arrival is the signal, and push buttons or remotes fit supervised openings. Specify the wrong trigger and a fast curtain still feels slow, because the door spends its day waiting for permission instead of moving.
The Headroom and Side Room Trade-Off
Among industrial doors, stacking models trade barrel diameter for a different spatial bill. The fold pack above the header needs clear headroom, sized with the fold count. The guides also run deeper than roll-up tracks because the bars travel inside them. None of it is enormous, but it is structural. Retrofitting the envelope after the walls are up is the painful version of this decision.
- Headroom above the header for the stacked pack, confirmed against roof trusses and crane rails.
- Side room for deep guides plus the lifting-belt return path.
- Fixing points rated for wind load transfer, welded or heavy-anchored into the building frame.
- Clearance for the chosen activation hardware: radar, loop, pull cord or remote.
Sensible buyers settle these four numbers before requesting quotes for any high speed PVC stacking door. A supplier can only check the envelope against the opening if the dimensions are on the table. Confirm clear width, clear height, available headroom and side room in writing, and the quotation you receive back will be a buildable one.
Stacking Door Speed in Honest Numbers
A stacking door is not the fastest door you can buy, and pretending otherwise wastes nobody’s time but your own. The curtain travels further and the pack is heavier, so cycle speeds on real projects cluster between roughly 0.5 and 0.8 m/s on large spans. Reinforced mid-size builds reach 1.2 to 2.0 m/s adjustable. Internal roll-up doors sprint at 2.0 to 2.5 m/s and win on pure frequency.
The honest way to size high speed PVC stacking doors is against what the opening had before. Set that stacking door against the manual roller shutter it replaces, one that cycles a dozen times a day and takes minutes to clear. The stacked curtain clears in a fraction of the previous time, and every avoided minute of an open hangar is heating that stays inside.
Waiting time is the second half of the same story. A hangar door that takes ninety seconds to clear adds half an hour of accumulated delay across a morning of movements. The fold pack is what makes that cycle fast on a span where no coiling curtain survives the wind. Speed on big doors is bought with structure first and motor size second.
Match the door to the traffic count
If the opening cycles hundreds of times a day, speed dominates and an internal roll-up door wins. If it cycles dozens of times a day across a huge, wind-exposed span, the stacking door’s stability and coverage dominate. Frequency first, then size, then speed.
The Verdict Against Spiral and Sectional Doors
Three rigid alternatives in the industrial doors family compete for the same large openings. Each wins a different job. High speed folding doors cover many of the same wide openings where spare wall exists beside the opening. The real contest for an overhead fold pack is against spiral and sectional construction.
| Property | PVC stacking door | High speed spiral door | Sectional door |
|---|---|---|---|
| Curtain | Flexible PVC with wind bars | Rigid aluminum slats | Insulated steel panels |
| Speed | Up to 1.5 m/s (ours, adjustable) | Fast rigid cycles, wind to Class 5 | Slowest of the three |
| Insulation | Minimal | Optional insulated slats | U-value down to 0.33 W/m²K |
| Security when closed | Moderate: a fabric curtain can be cut | High: rigid slat curtain | High |
| Best fit | Huge, windy, high-cycle openings | Fast, secure exterior access | Openings that stay closed most of the day |
Read the table as a routing rule for stacking doors against their rigid rivals. When the question is frequent fast access across a span no rigid door wants, the stacking door wins. When the opening has spare wall instead of spare headroom, high speed folding doors for large openings remain the alternative worth pricing.
Maintaining Lifting Belts and Curtain Sections
Compared with other large industrial doors, the stacking mechanism concentrates its wear in a few serviceable parts. The wear lands on the lifting belts, the belt pulleys at the top shaft, and the curtain sections themselves. None of these is exotic, which is exactly why they get forgotten until a belt frays through.
- Inspect the nylon lifting belts visually every six months for fraying, glazing or edge wear.
- Keep the top shaft pulleys free of dust and debris so the belts track cleanly.
- Check wind bar pockets and guide interiors during the same visit for packed dirt.
- Test the photoelectric sensors and force limiting at every service interval.
Segmented curtains cut repair bills
Because the curtain is built in sections between wind bars, a damaged section or a worn belt is a single-component swap, not a full re-curtain. Buy the door with this modularity confirmed in the offer, and keep one spare section on site.
Facilities that follow the six-month rhythm get the unglamorous outcome that matters: the door is simply never news. The blowout-and-downtime pattern that plagues underspecified soft curtains on big openings comes from skipping exactly this list.
Check These Five Points Before You Commit
A stacking door quotation is only as good as the site data behind it, so put five answers in front of any supplier before asking for a number. It is the same checklist our engineers work through on every large-opening enquiry. It is also where the flexible-door family forks: buyers torn between storage mechanisms can read the PVC folding doors trade-offs next to this page.
- Clear opening size, plus headroom and side room measured on site, not from drawings alone.
- Wind exposure: indoor, canopied or fully external, with the site’s worst-case gusts described.
- Traffic count per day and what moves through: forklifts, trucks, aircraft, cranes.
- Activation method and safety requirements, against EN 12453 force limits.
- Curtain specification: PVC thickness, vision panels at vehicle eye level, color, UV grade.
Bring those five answers and any quotation for high speed PVC stacking doors becomes an engineering document rather than a guessing game. The supplier’s job is to turn them into a buildable envelope, and yours is to make sure nobody skipped the measurements. For the head-to-head version of that choice, see lifting door vs stacking door comparison.
Frequently Asked Questions
How much headroom does a stacking door need above the opening?
Enough clear space for the folded pack, sized from the fold count and curtain thickness rather than door height. Confirm the exact figure with the supplier against your roof steel, since guides and pulleys add to the pack.
What wind class can a high speed PVC stacking door reach?
EN 12424 defines Classes 0 to 5. Our stacking doors are rated Class 3, equal to 700 N/m², and reinforced builds exist for harder sites. Treat any class above 5 in a supplier quote as a claim needing test evidence.
Why is a stacking door slower than a roll-up door?
The curtain travels a longer path and the fold pack weighs more than a tightly coiled roll. Large-span stacking doors commonly cycle near 0.5 to 0.8 m/s, while internal roll-up doors reach 2.0 to 2.5 m/s on short travel.
Can one damaged curtain section be replaced on its own?
Yes. The curtain is segmented between wind bars, so a torn section or a frayed lifting belt is a single-component replacement. Order the door with modular sections confirmed and keep one spare on site.
