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creeper 02-22-2012 07:44 PM

how to collapse your house

rossfingal 02-22-2012 07:58 PM

Major - "faux-pas""

Yoyizit 02-22-2012 08:20 PM

So the basement floor provided rigidity for the basement walls. Maybe on other jobs that didn't collapse they were just lucky.

gma2rjc 02-22-2012 08:43 PM

I'm glad the 3 workers made it out alive.

This wouldn't have happened if Mike Holmes was on the job.... :no: j/k

concretemasonry 02-22-2012 08:43 PM

It sounded like an underpinning to lower a basement floor that did not go right or as expected. The first floor slab provided a laterial "diaphragm" that kep the tops of the walls far enough apart, but the lateral force on the walls could have caused an unexpected failure that ultimately dropped much of the structure and cause the above grade structure to fail completely because of a lack of rigidity and support where it was designed for.

Just an example of to use someone with knowledge for an underpinning.- Not an amateur or DIY project since anything can happen until the job is done correctly and secured.

Yoyizit 02-22-2012 08:51 PM

And if the soil was saturated from previous rains there might have been a lot of pressure on those walls, more at the bottom.

concretemasonry 02-22-2012 09:16 PM

Yoyzit -

Obviously, there would be more lateral soil pressure deeper, so the basement slab resisted the lateral pressure as required for both block and concrete walls systems, so the walls failed and everything came down. Many codes require 3 1/2" of contact between the wall and the slab, since rebars/dowels are not always that positive or really there.

Very often, a good contractor will leave a 12" wide section of floor every 4' to provide lateral support during construction of something as seemingly unimportant as a interior drain tile installation at the level of the bottom of a footing.


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