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Pancake Collapse
This pattern of collapse is possible in any building where simultaneous failure of exterior walls results in the upper floors and the roof collapsing on top of each other such as in a stack of pancakes — thus, the name of this collapse pattern

V-Shaped Collapse
This pattern of collapse occurs when the outer walls remain intact and the upper floors and/or roof structure fail in the middle

Lean-to Collapse
This pattern of collapse occurs when one outer wall fails while the opposite wall remains intact. The side of the floor or roof assembly that was supported by the failed wall drops to the floor, forming a triangular void underneath

A- Frame Collapse
This pattern of collapse occurs when the floor and/or roof assemblies on both sides of a center wall collapse into what might be seen as opposing lean-to collapses. This pattern offers a good chance of habitable void spaces on both sides of the center wall
