Bifold vs. Hydraulic vs. Sliding: Choosing a Door for Your Steel Hangar

Why the door decides the building

A hangar door is not an accessory. It sets the endwall framing, the eave height and a good share of the budget. Choose the door first and the building is designed around it. Choose it last and you may find the opening you need does not fit the building you bought.

Bifold doors

A bifold door is a single panel hinged at the middle. Cables or straps lift it up and out, folding it in half under the header.

• Opening: full width of the endwall, with a shaded canopy when open
• Headroom: the folded door hangs below the header, so the eave is set a few feet above the door height
• Speed: moderate; a 50 foot door opens in about a minute
• Cost: mid range, and the most common choice for private hangars

Hydraulic doors

A hydraulic door is one solid panel that swings up on cylinders mounted to the building columns.

• Opening: full width, and it suits very wide openings
• Headroom: the raised panel acts as a canopy and clears the full door height, so less eave is lost
• Speed: fast and quiet, with no cables to maintain
• Cost: higher up front; the building columns are engineered to carry the door load

Sliding doors

Sliding doors are panels that roll aside on a track, either stacking to one side or splitting to both.

• Opening: wide, but the stacked panels take up endwall or need pockets beyond the opening
• Headroom: minimal loss; the track sits just above door height
• Speed: manual on most private hangars, which means pushing panels in wind and snow
• Cost: lowest, and the simplest to repair

Picking one

• Single aircraft, standard site: bifold
• Wide opening, frequent use or a tall tail: hydraulic
• Tight budget or a secondary opening: sliding

Whichever you choose, tell your builder before the frame is engineered. Door loads, especially for hydraulic systems, are carried by the building itself.

Ready to plan your hangar?

Silverline Structures engineers steel airplane hangars around the door you want, with cold formed or red iron framing to match. Explore our airplane hangar page or contact a design specialist to start with a quote.