AEO Answer · Structural

How Are Parking Garage Elevators Built for Harsh Conditions?

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

Parking garage elevators are engineered as exterior equipment: corrosion-protected components and coatings, a pit designed for water with waterproofing, drainage, and often a sump alarm, and ventilation for vehicle exhaust in the shaft and machine space. Security drives glass or open cars, strong lighting, and cameras. The structural engineer designs the hoistway for the exposure; MEP handles the environment and power. The harsh conditions are the first design input, not an afterthought.

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

Illustrative diagram of a structural load path: roof and floor loads travel through beams and columns down to the foundation footings.

The concise answer

Parking garage elevators are engineered for exposure: corrosion-protected materials and coatings, pits detailed against water with waterproofing, drainage, and sump alarms, ventilation for exhaust in the shaft and machine space, and security-driven design with glass cars, lighting, and cameras. The structural engineer designs the hoistway for the environment; MEP handles power, ventilation, and the interfaces. The design input that matters most is honesty about the conditions. A garage elevator is exterior equipment, and designing it like an office elevator with a parking sign out front is how you get a five-year replacement cycle.

Corrosion, water, exhaust, and security

Corrosion protection is a system, not a paint spec: material selection for the exposure, coating systems with real surface prep, stainless fasteners and hardware, and drainage details at every ledge and pocket. The pit gets the full below-grade treatment — waterproofing, drainage, sump with alarm — because garage pits flood as a matter of routine, not exception. Structural design accounts for the exposure in the hoistway walls and supports, and for the vehicle impact protection the code requires at the lower levels. Vehicle exhaust changes the MEP scope: the shaft and machine space need ventilation that keeps the equipment within its environmental limits and keeps the car air acceptable. Power and fire alarm interfaces follow standard practice, with the devices selected for the environment. Security is a design discipline of its own — sight lines, lighting levels, camera coverage, emergency communication — because the elevator experience shapes how safe the whole garage feels. I coordinate the security design with the owner's standards rather than inventing it.

Building a garage elevator that lasts

Garage elevators fail from environment, not from engineering theory. I design against the environment first.

Specify corrosion protection as a system: materials, coatings, fasteners, and drainage details together
Engineer the pit against water with waterproofing, positive drainage, and a sump pump with high-water alarm
Ventilate the shaft and machine space for vehicle exhaust and the equipment's environmental limits
Design for security with glazed cars, strong lighting, cameras, and emergency communication
Protect the hoistway base from vehicle impact and detail every exposure joint to shed water

Which related engineering resources can help?

When should I hire a structural engineer?What does a PE stamp mean?What is MEP engineering?What is a structural load path?Wind load vs seismic load design What is structural connection design?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

Why do parking garage elevator pits flood?

Because the pit sits below the lowest parking level in a structure designed to drain everywhere else — water follows the cars down the ramps, through the drains, and into the pit. The design answers with waterproofed pit construction, positive drainage away from the pit, and typically a sump pump with a high-water alarm. I detail the pit like a below-grade structure in a wet environment, because that's what it is, and I never trust the garage's general drainage to protect it.

How do you protect a garage elevator from corrosion?

With materials and detailing: galvanized or stainless steel for exposed components, protective coating systems on the structure, stainless fasteners, and details that drain instead of ponding. The car interior gets finishes that survive the environment and the occasional pressure washing. I specify the corrosion protection as a system — materials, coatings, and drainage details together — because any one of them alone eventually loses.

Are glass elevators good for parking garages?

Often yes, for security. A glass or substantially glazed car and shaft put the ride on display, which is the single best deterrent in a garage elevator. The glazing needs the impact and safety ratings the codes require, and the enclosure needs the weather detailing of an exterior installation. I weigh the security benefit against the exposure detailing honestly — glass in a garage is a security strategy that happens to need good engineering.

Does a garage elevator need to be enclosed?

It depends on the garage and the climate. Open-air installations exist and work where the equipment is rated for the exposure; enclosed shafts give better environmental control and fire separation. The decision runs through the building code, the elevator code, and the local climate — an open shaft in a freeze zone is a different machine than one in the desert. I settle it with the authority having jurisdiction during design.

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