What occurs in a Lean-to Collapse?

In a Lean-to Collapse, one wall fails while the opposite wall remains intact, resulting in a triangular void. This type of collapse typically occurs in structures where the load-bearing elements are not balanced, leading to the failure of one side. The structure's design often allows for this uneven collapse because of the way it is anchored or supported. The failure on one side creates a significant void that is triangular in shape, making this scenario particularly dangerous for anyone trapped within the building. Understanding this specific failure pattern is crucial for responders to effectively assess the risks and plan rescue operations, as it informs them of potential areas that may still be stable and accessible for rescue efforts.