Sectional vs rolling steel commercial door: which is right for you?

Both doors close a large opening, but they move differently, and that one difference decides most of the choice. Here is how each works, where each fits, and the questions that settle it for your building.

How a sectional door works

A sectional door is a stack of hinged panels. Rollers on each panel ride in tracks at the sides. When the door opens, the panels travel up and turn back, so the door ends up lying flat under the ceiling. On a tall commercial building the tracks can run higher up the wall before they turn (a high-lift track) or straight up the wall (a vertical lift), which keeps more clear height inside.

Because each panel is a flat section, a sectional door can be insulated, can carry rows of windows, or can be a full-view aluminum and glass door. An article in Construction Specifier notes that insulated sectional doors reach R-values up to 27.2, which is why they show up on climate-controlled bays, cold storage and showrooms.

How a rolling steel door works

A rolling steel door is a curtain of narrow interlocking steel slats. When it opens, the curtain winds onto a barrel in a coil box (the hood) mounted just above the opening, and the edges ride in guides on each side. There are no horizontal tracks. DASMA's technical data sheet on rolling doors points out that this keeps the room the door needs, above the opening and into the building, to a minimum, so pipes, ducts, lights and sprinklers near the opening can stay where they are.

DASMA also lists the other strengths of the design: few parts, sizes from under 2 feet to over 60 feet, steel, stainless steel or aluminum curtains, mounting between the jambs or under the header, high resistance to forced entry, wind load designs for any size, and fire ratings up to 4 hours.

Sectional vs rolling steel at a glance

Question	Sectional door	Rolling steel door
Where it goes when open	Flat under the ceiling, or up the wall on a high-lift or vertical track	Coiled in a hood just above the opening
Room it needs	Headroom for the tracks and depth into the building for the door to lie back	Headroom for the coil, very little room behind it
Insulation and windows	Strong: insulated panels, window rows, full-view glass	Limited: vision or ventilated slats on some curtains
Security	Good	Strong: a steel curtain locked in its guides
Fire rating	Not the usual choice	Available with ratings up to 4 hours
Hard daily use	Good with high-cycle springs	Strong: simple, tough slats
Typical places	Warehouse bays, dock doors, service bays, showrooms, restaurants	Storefronts, secure storage, tight openings, fire walls, counters

Which one is best for my building?

Start with the space around the opening, then the job the door does.

• Look up first. If ducts, heaters, lights or a crane run close above the opening, a rolling steel door is usually the easier fit. If the ceiling is high and open, a sectional on a high-lift track keeps the most clear height.
• Look behind the opening. A standard sectional needs at least as much depth into the building as the door is tall. Racking or equipment close behind the wall points to a rolling door.
• Think about the air inside. A heated shop, a cooler or a showroom loses less heat through an insulated sectional.
• Think about who could get in. A storefront or storage room that sits empty at night is a natural place for rolling steel.
• Check the code. An opening in a rated fire wall needs a listed fire door, which is most often a rolling steel fire door.
• Count the cycles. A door that opens dozens of times a day needs springs and an operator built for it, whichever type you pick.

Many buildings use both: insulated sectional doors on the dock and service bays, and rolling steel on the storefront, the parts cage or the fire wall. Our guide to commercial warehouse door types covers high-speed and dock doors too.

Openers for each type

Sectional doors run on trolley operators, like a large garage door opener, or on jackshaft operators that mount beside the door and turn the torsion tube. Rolling doors run on hoist or jackshaft operators that drive the barrel, and DASMA notes they can also be raised by hand, by a chain hoist or by a crank, with the operator above, beside or in front of the door. When you replace one type with the other, the operator usually changes with it.

Common questions

Rolling steel doors vs sectional doors: which one is better?

Neither is better everywhere. A sectional door wins on insulation, windows and a quieter ride. A rolling steel door wins on tight space, security, fire ratings and toughness. The opening and its job decide.

Which is more secure?

A rolling steel door. The curtain is interlocked steel held in steel guides, and DASMA lists high resistance to forced entry among its main advantages. For a storefront that needs light and air while closed, a rolling grille does the same job.

Which is quieter?

Usually a sectional door, especially with nylon rollers and a jackshaft or belt drive operator. A rolling door makes some noise as the slats wind onto the barrel.

Which costs less?

It depends on the size, the gauge or insulation, the operator and any fire rating, so there is no rule that one type is always cheaper. The fair way to compare is two quotes for the same opening. Your estimate is free, and you approve one flat price before any work starts.

Which matches the look of the building?

Sectional doors offer the most styles: insulated steel panels in many colors, window rows and full-view aluminum and glass, which suits restaurants, dealerships and showrooms. Rolling doors come in steel, stainless and aluminum with painted finishes, and perforated slats can let light through.

Can a rolling steel door replace a sectional door?

Often, yes, when the opening has room for the coil box above it and the jambs can carry the guides. It is a common change when a building adds racking or ductwork behind the opening. The opening is measured for headroom and side room first.

How G Brothers helps

G Brothers installs and services rolling steel, sectional, high-cycle and fire-rated doors for warehouses, storefronts and loading docks across the Denver metro, on every brand and every operator type, including jackshaft, trolley and hoist. We dispatch 24/7, our average response is about an hour and a half, common parts ride on the truck, we are members of the International Door Association, and we can provide a certificate of insurance, usually within 24 hours. See commercial garage door installation, rolling steel door repair and all commercial door services, read how much ceiling clearance a rolling steel door needs, call (720) 421-6489, or ask for a free estimate.

Sources

• DASMA, Technical Data Sheet #2501, Rolling Door Advantages (space needed, sizes, mounting, operation, security and fire ratings)
• Construction Specifier, Choosing the right commercial door (rolling and sectional doors compared, headroom and backroom, insulated sectional R-values)
• Garaga, The three types of commercial and industrial doors (standard, high-lift and vertical lift tracks; slat curtains)