What is typically used to elevate an RTU off of the roof?

The correct answer is the curb because it serves as a raised structure that provides necessary elevation for the rooftop unit (RTU). Curb mounts are specifically designed to elevate these units above the roof surface, which allows for adequate drainage, prevents water pooling, and helps with the longevity of the unit by keeping it dry and free from debris.

Additionally, curbs are often constructed with materials that can support the weight of the RTU and are typically installed during the initial stages of roofing or as part of a new installation. They also provide a secure mounting surface for the RTU, ensuring stability and proper alignment for ductwork and electrical connections.

While stands, platforms, and pillars could potentially serve similar purposes, they are not the standard choice for elevating RTUs specifically. Stands and platforms may not provide the same level of waterproofing and structural integrity as a curb, and pillars are typically not designed for this application. Thus, the curb is the most appropriate and standard solution for elevating an RTU off the roof.