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Hammered Thumb
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Typically a slab edge would be thickened to support the walls if you have no frost depth to deal with. But if you are trying to raise your subgrade by 3' of fill (other thread), you will probably be going to a stem wall and not a mono slab.

There's no need to have more than a 4" slab under the remainder of the rooms, so you would just thicken any areas with larger loads.

RE the plumbing I don't know if you're hedging against more of a long-term maintenance issue or if this endeavor doesn't pan out and you want to rip it out, but if you have the public in here for the tubs, changing and massage rooms, having no steps takes precedence over in-slab plumbing.
 

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The foundation you need depends on the annual temperature, location, seismic activity, loads, drainage and soil type. I could make suggestions but you need advice from a design professional who designs in your area. Sure, you could probably vastly over design it and make it work but you will spend more than paying for a design.
FYI, your hot tubs are about 70 lbs. per square foot. Typical codes for residential first floors are 40 lbs. per square foot, so it needs more.
 

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Discussion Starter · #8 ·
Typically a slab edge would be thickened to support the walls if you have no frost depth to deal with. But if you are trying to raise your subgrade by 3' of fill (other thread), you will probably be going to a stem wall and not a mono slab.

There's no need to have more than a 4" slab under the remainder of the rooms, so you would just thicken any areas with larger loads.

RE the plumbing I don't know if you're hedging against more of a long-term maintenance issue or if this endeavor doesn't pan out and you want to rip it out, but if you have the public in here for the tubs, changing and massage rooms, having no steps takes precedence over in-slab plumbing.
Thank you. It's not for the public, the hot tubs are personal.
 

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Concrete & Masonry
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3,964 Posts
If they are for personal use why do you have them enclosed in the tiny rooms? There are also several other things in that area that would lead one to believe that it's not for personal use only.
I was asking myself similar questions, but decided I'd rather not actually know the answers, lol........

Without spending too much time, if it were here, it would likely require a thickened edge and a 4" floor minimum. 6 or 8" thick is likely gross overkill with zero benefit. The hot tubs aren't that heavy, less than half the weight of a full sized pick up truck, which there are millions of parked inside garages in the US right now with 4" or less thick floors........
 
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