We are working on a bathroom project, and when the old floor was removed to the crawl space, it turned out that the crawl space was quite low in this part of the house where the rock protrudes in some places. Instead of constructing a thicker joist, I am considering filling in the foundation and casting instead. It feels like it would be easier since the house has "settled," and constructing the joists would be quite complicated.

However, the problem is that the wooden floor joists extend into the adjacent room, so I can't really remove them. Does anyone know if it's possible to leave the joists in place and simply cast around them? If so, is there anything specific to keep in mind?
 
It is probably not a good idea. There is a high risk of moisture migrating up through the concrete, causing the beams to rot.

In the 1970s and part of the 1980s (I think?), it was quite common to cast the sill into the base slab. Often, the beams were also pressure-treated at that time. This now results in enormous problems with mold damage and rotten, foul-smelling pressure-treated beams. These are now replaced at quite high costs.
 
Thanks for the response, almost suspected it. Have to try to come up with a good way to switch them and remove those that are in the way before casting. Probably need to consult a carpenter on site so the whole house doesn't collapse. :)
 
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