Standard Commercial Garage Door Sizes in Calgary

The most common standard commercial garage door sizes are 8 to 10 feet wide by 8 to 10 feet tall for loading docks, 12 by 12 to 14 by 14 feet for drive-in and shop doors, and 12 to 16 feet wide by 14 feet tall for truck and fleet bays. Those are starting points, not answers. The right size depends on the tallest vehicle, the widest load, and how much room you have above and beside the opening.

Commercial doors are rarely ordered off a shelf the way residential doors are. Most are built to the opening, so a "standard" size is really the range suppliers stock panels and hardware for. Getting the measurements right before you order is what keeps a Calgary warehouse or shop from paying for a door that clips a roof rack or will not fit the building.

This guide covers the common sizes by use, how to size a door for your vehicles and racking, headroom and lift types, sectional versus rolling steel, and what Calgary's wind and winters mean for the choice.

What are the standard commercial garage door sizes?

Standard commercial door sizes run from 8 by 8 feet for small dock doors up to 16 by 16 feet or larger for big truck bays. Width and height both move in 1 or 2 foot steps, and anything outside the stocked range is built to order.

Here are the sizes you will see most often, grouped by what the door does:

• Loading dock doors: commonly 8 or 9 feet wide by 8 or 10 feet tall, and 10 by 10 feet where larger pallets or taller trailers are handled.
• Drive-in doors for shops and small warehouses: commonly 10 to 14 feet wide by 10 to 14 feet tall, with 12 by 12 feet a very common choice.
• Truck and fleet bays: commonly 12 to 16 feet wide by 12 to 14 feet tall, and wider where two vehicles pull through side by side or a long trailer swings in.
• Large industrial and bay-style openings: 16 feet wide and up, often 14 feet tall or more, built to the opening.

Treat every figure here as a typical range and confirm against the supplier's size chart for the specific door model. Wayne Dalton, Amarr and Clopay all publish different stocked sizes and options, and a door that is standard from one brand can be a special order from another.

How do you size a door for your vehicles and racking?

Size the door from the biggest thing that has to pass through it, then add clearance. Measure the tallest vehicle with its roof equipment, the widest vehicle with mirrors folded out, and the largest load that gets carried through, and add clearance on every side.

A workable method is to measure in this order:

• Tallest vehicle, with everything on it. Include roof racks, ladders, beacons, A/C units and any box or lift gate that rides high. Add at least 6 to 12 inches of clearance so a low-hanging door section or a bumped track does not become a daily risk.
• Widest vehicle, mirrors included. Add clearance on both sides. Drivers do not thread an opening perfectly every cycle, and tight openings are where bumper and panel damage comes from.
• Largest load on its way through. Forklift mast height when lowered, pallet width, and any machinery that moves between the bay and the yard.
• Racking and interior obstacles. Racking set too close to the door can block the track and hardware on a standard lift door, and it can block the vertical rise on a high lift door.

Fleet bays have one more consideration: the door has to clear the vehicle's height as it enters, not only when it is parked. A van with a roof rack that clears an opening on level ground can still hit the header when it drives over a ramp or a snow berm at the door, which is a normal Calgary winter condition.

If your fleet will change, size for the next vehicle you plan to buy and not the one you own. Re-framing an opening later costs far more than ordering a slightly larger door now.

How much headroom does a commercial overhead door need?

Headroom is the space above the opening where the track, springs and hardware live. A standard lift commercial door typically needs somewhere around 12 to 15 inches above the opening, depending on track size, but low headroom and high lift setups change that number a lot.

Headroom is the measurement that most often decides what you can install. Also check these three:

• Headroom: the clear space from the top of the opening to the lowest obstruction above it, such as a beam, duct, pipe or sprinkler line.
• Side room: the clear wall space beside the opening where the track brackets mount. Typically a few inches per side is needed, and it varies by hardware.
• Backroom: how far the horizontal track runs back into the building, which is roughly the door height plus an allowance for a standard lift door, and more if it is motor operated.

Facility managers in older Calgary industrial buildings often discover that ducts, conduit, or a mezzanine have eaten the headroom the original door once had. Measure the real obstruction, not the original drawing. All of these figures are typical ranges, and the supplier's installation specs for the exact door control what goes in.

What is the difference between standard lift, high lift and vertical lift?

Standard lift tracks curve over soon after the opening and run horizontally just below the ceiling. High lift lets the door rise higher before curving back. Vertical lift runs the track straight up the wall and the door never goes horizontal. Which one you pick depends on what is above the opening.

Standard lift. This is the default and the least expensive layout. The door rises a short distance, then follows the track into a horizontal run. It fits buildings with ordinary headroom and open ceiling space behind the door.

High lift. The track continues vertically for a set distance before turning horizontal. This is the answer when a crane, an overhead conveyor, a tall forklift mast, or a mezzanine sits just behind the opening and the door has to get up out of the way. The tradeoff is that it needs far more headroom and more track.

Vertical lift. The door travels straight up the wall and stays vertical when open. It suits tall openings with a lot of wall height above and almost no room behind the door, where a horizontal track cannot fit at all. It needs a lot of vertical headroom and more hardware, so it is not the first thing to reach for.

Low headroom. Special hardware can reduce the space above the opening when a standard lift will not fit. It is a workable fix in tight buildings, though it adds complexity and can limit door height and spring options, so check it against the specific door.

If you are unsure which layout your building supports, a site measurement settles it faster than any chart. The details of how these doors are installed and serviced are covered in our guide to industrial overhead door installation and repair in Calgary.

Should you choose a sectional door or a rolling steel door?

Choose a sectional door when you need insulation, quiet operation, and the full opening height. Choose a rolling steel door when headroom is tight, security matters most, or the opening is very wide or tall. The two have very different space requirements, so the choice often follows from your measurements.

Sectional doors are hinged panels that travel on tracks. They come insulated or uninsulated, with window options, and they are the usual choice for shops, dock doors and heated spaces. They need the track runs described above.

Rolling steel doors coil into a drum above the opening. They need no horizontal track, so they work in places where a sectional door will not fit, and they are favoured where security and durability matter more than insulation. They do need room above the opening for the coil and hood, which grows with door height, so confirm that before ordering. Our article on rolling steel door service in Calgary explains how coiling doors differ from sectional ones and what goes wrong with them.

A simple rule of thumb is that a heated loading dock or shop usually wants a sectional door, while a storage bay, a secured service entry or an opening where a track cannot fit often points to rolling steel.

Whichever you pick, door size and door type are decided together. A 14 by 14 foot opening with 12 inches of headroom is a different problem from the same opening with a mezzanine two feet above it.

How should wind and weather affect your door size and choice in Calgary?

Calgary's chinook winds, open industrial yards and winter cold all push toward a door that is built for the load and sealed properly. Larger doors catch more wind, so a wide door in an exposed yard needs hardware and panels specified for the wind load at that site.

A few practical points for industrial areas in Calgary and nearby Airdrie, Chestermere and Okotoks:

• Wide openings and wind. The bigger the door, the more surface area for a gust to push on. On exposed sites, such as an open lot in the east or northeast industrial areas, wind load is part of choosing panel strength and reinforcement. Wind ratings are specified for the job and the door, not assumed, so ask for the rating on the exact model.
• Drive-through bays. Doors that stay open for traffic let wind blow through the building. Think about how the door sits against the prevailing wind and whether you want a wind-rated design.
• Frost and snow at the threshold. Ice build-up under the bottom seal stops the door from closing fully. Plan for drainage at the opening and a seal that stays flexible in cold.

Wind rating is one place where we never promise a result in advance. What a door is rated for depends on the model and the site, and it is settled when the door is specified for that job. Our guide to how Alberta weather affects commercial door lifespan goes further on the freeze-thaw side.

Do commercial garage doors need insulation in Calgary?

Insulate any door that opens into a heated space, a worker area, or a spot where you store temperature-sensitive stock. A bare steel door leaks heat badly through a Calgary winter. For unheated storage or a yard gate, insulation is rarely worth paying for.

Insulated sectional doors use panels filled with polyurethane or polystyrene foam, and a thicker panel does more than a thin one. Seals at the bottom, sides and top matter as much as the panel, because a gap leaks more heat than the panel saves. Windows on an insulated door add light but cut the insulation value at that spot, which is a fair tradeoff in a shop and a poor one in a cold-storage room.

Dock doors add a separate issue, since the opening is regularly open to a trailer. Dock seals and shelters around the opening reduce the heat loss while a truck is backed in, and they are sized to the door, so the opening size you choose affects what fits.

If you are weighing insulation, our article on whether commercial doors need insulation in Calgary's climate works through the trade-offs in more detail. Door size affects it too, because a bigger door has more edge to seal.

What does a commercial door site measure involve, and who can help in Calgary?

A proper site measure records the opening width and height, headroom, side room, backroom, the floor and header condition, and what is mounted around the opening. Doing it right avoids ordering a door that does not fit.

Before a quote, have these ready:

• The opening's width and height at the narrowest and lowest points.
• Every obstruction above and beside the opening, with its distance.
• The tallest and widest vehicle or load that has to pass.
• Whether the space is heated and whether the door will see wind.
• How often the door cycles in a day. High-cycle doors need heavier springs and operators than occasional-use doors.

C Town Doors supplies and installs Wayne Dalton, Amarr and Clopay doors for commercial and industrial openings across Calgary, Airdrie, Cochrane, Chestermere and Okotoks. We are licensed, bonded and fully insured, and same-day service is available on most repairs, with emergency service available. For a closer look at what a commercial install involves, see our guide to commercial door installation in Calgary. If your door is part of a parking structure instead, read about parkade door systems in Calgary.

If a door you already have is giving trouble, our commercial garage door repair article covers the common faults. To talk through sizes for a new opening, see our commercial steel doors page or contact C Town Doors, or call (403) 668-6686.