By using building Collapse Indicators helped firefighters when arriving on the scene of a working fire use the exterior marking on a building that indicates the presence of lightweight structural components within.
Moreover, Structural elements that should be considered as indicators of collapse such as unprotected stool columns and beams exposed to heavy fire. The expansion of structural steel is attacked by the heat of fire. Unprotected light steel and steel beam roofs exposed to severe fire. Cracks or bulges in the wall. Water or smoke pushing through what appears to be a solid masonry wall. Unusual sounds coming from a building or dwelling. Truck traffic will notice soft or spongy feet.
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