When I read "The day the house collapsed" I expected something along the lines of: "The day the house collapsed, Wilom stayed home from school" or "The day the house collapsed, Wilom was running late for work." But instead, we get what happened in the first moments after the house collapsed rather than what the situation was the day it collapsed. So the two halves of that sentence don't go together.
Beyond that, this feels as if I've walked into the middle of something without quite enough context. You say he was trapped under the rafters, then mention "the" wooden table (what table? kitchen table?), and then repeat the fact that he's trapped.
So to me it feels rushed, disjointed, and awkward. If you're going to start with "The day the house collapsed," take time to set things up. That's your hook right there; you don't need to immediately jump to the collapse. Describe what leads up to it.