New answers tagged remodeling
What you are calling a floor joist, appears to be much thicker than a 2x floor joist. Maybe like a 4x8 or something. So it's probably a "bearer" resting on the piers, which would explain why they are far apart. Typically you would then rest floor joists across those beams, (or use Simpson hangers if the floor needs to be nearly flush to the beams -- ...
As long as you have proper drains and a good pump/pit for the water to drain into 8' is not a problem. Check local code as some require a larger pit when located a long distance from the toilet. I think the distance for the larger pit was based on number of levels + bathrooms.
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