How are 2nd floor joists supported at exterior walls in old turn-of-the-century (1900) brick homes?

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How are 2nd floor joists supported at exterior walls in old turn-of-the-century (1900) brick homes?

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Usually those walls are 3 layers of brick thick. The wood beams are set into the interior layer and bear directly on the brick.
The ends of the joists are cut at an angle called a firecut. This is so that the joist can rotate downward and fall out in case of a fire. Otherwise, the falling floor system might lever the brick above and cause the wall to fall outward.

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