Post #3138147

@ryan@bemrose.social because it wasn't the debris it was the fire caused by the debris hope that helps 1. WTC 1 showered WTC 7 with debris, igniting fires and destroying the sprinkler system. 2. Long-duration fires undermined the steelwork supporting the eastern portion of the 10th floor, causing it to collapse. 3. The eastern portion of 10th floor fell onto a fire-weakened ninth floor, causing its eastern section to collapse. 4. A downward cascade of floor collapses ensued. 5. As the collapse progressed, interior columns buckled. 6. Floor framing supported by the buckling columns fell, causing failure to propagate to the top of the building, which manifested itself in the collapse of the east penthouse. 7. Falling debris impacted beams at the edges of the intact portion of the structure, causing failure to progress across the building.