What is the maximum number of stories allowed in platform framing?

In platform framing, the standard limit for the maximum number of stories is typically three. This construction method involves building one or two stories at a time on top of a platform, where the structural elements of one story support the next.

The reason three stories are allowed is due to the inherent characteristics of platform framing, such as its ability to provide good stability and fire resistance when constructed properly. With three stories, the design can still effectively manage weight distribution, lateral forces from wind, and the movement of the building materials under stress. Most building codes recognize this limit to ensure safety and structural integrity, especially considering factors like fire spreads between floors and ease of access for fire fighting.

Building beyond three stories often introduces significant complexities, including increased loading on structural systems, which may not be adequately addressed by the platform framing method. Therefore, construction practices and building codes have established three stories as a practical maximum for safety and performance reasons within this type of framing.