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The supported lean-to collapse results from the failure of the support at one end of a floor or roof. If one bearing wall blows out while the other remains intact, the floor will drop at that end. The falling end comes to rest on the ground or floor below, creating a sloping floor or roof that is su...

The supported lean-to collapse results from the failure of the support at one end of a floor or roof. If one bearing wall blows out while the other remains intact, the floor will drop at that end. The falling end comes to rest on the ground or floor below, creating a sloping floor or roof that is supported at each end (fig. 22-31). Everything that was on top of the floor will be thrown into a heap at the low end. There is an excellent chance of survival for people who were on the lower floor if they were near the remaining wall, which is where large voids are likely to be found that run the depth of the building (fig. 22-32). People who were on the falling floor may also survive if heavy objects don't crush them. The worst chance of survival is for anyone who was on the lower floor in the vicinity of the failed wall.