Bottom Rolling Doors

The Bottom Rolling door has been around since first century Rome and remained essentially unchanged for centuries. And for good reason, a high quality bottom rolling hangar door is the most rugged and reliable door there is, period. A well designed bottom rolling door system will remain operable in conditions that will stop other designs in their tracks. High winds, heavy snow and power outages that disable other designs are easily overcome by a high quality bottom rolling door.

This robust design and construction also translates to the lowest life cycle cost of any design. Long service life components that require very little maintenance means bottom rolling doors offer an outstanding value for many applications. Bottom rolling designs are flexible and easily customizable to allow virtually unlimited design options. Unlimited size, highest insulation capability, truck doors, pilot access doors, air plenum or filter banks, tail doors, liner panels, glazing, tail apertures, unlimited cladding options.

If your mission is critical or your location is remote or you just want the peace of mind knowing that your door will work every time and your extremely valuable asset is protected; then a high quality bottom rolling design should be at the top of the list.


With Bottom Rolling Hangar Doors, it’s just the way it sounds. Each panel slides right or left. This allows for the full opening to be exposed with the simple movement of a couple individual panels. The biggest benefit from this style door is the flexibility of the panels’ operation. The panels don’t require any power to move them. Manually operated doors are less complex and less expensive. However, electric operators can be designed and built into your system to meet your specific needs.

All Moving Panels

For applications needing maximum flexibility in larger hangars allowing multiple aircraft without using stacking pockets (see “Single Stack” below). Simply move all panels to the side of the hangar which doesn’t need to be open. In Northern climates, all moving configurations may require heated rails.

Bi-Parting Panels

For applications where the main building structure is not wide enough to allow doors to stack.

Single Stacking Panels

The Single Stack door installs on virtually any type of building, saving money and space. Single Stack doors have been specified for aircraft hangars, tee hangars, industrial and agricultural buildings and even… floating barges!

Northern Rail Layout

Named partly because of its common geographical location, the Northern states. The rails are protected from ice and snow in cold weather by a pocket built into the building that keeps the rails protected. Rails are also protected by the physical orientation of the stack of panels leaving no exposed rails in the closed position. The rail layout only affects the location of the rails in respect to the building, a Northern layout can be chosen for Biparting and Single Stack configurations.

Southern Rail Layout

Named partly because of its common geographical location, the Southern states. The rails stay outside of the buildings’ walls because snow and ice are not as concerning in the south and the face that the panels are on the exterior of the building allow more space to be utilized for the customer.

Solar Powered Electrically Operated Doors!

Electrically operated bottom rolling doors present some unique power supply and control issues in some configurations. 21st has overcome these issues with our “Solar Option”. Solar panels are properly sized and installed into the outside skin or cladding of the door. The power from the panels charge a battery bank which is built into the door. The battery bank provides an uninterruptible power source to the motor drive which will open or close the door. The door will function normally even when the power is off to everything else in the building! This Solar Option is available on all the different 21st door models.

Bottom Rolling Hangar Door Service

Alamo Door Systems services and repairs all makes and models of Bottom Rolling Hangar Doors.