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Old 07-27-2012, 08:09 AM   #1
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Does anyone have a guess on how much a foundation mite settle. I have 4 12" round concrete foundations 42" deep with 6x6 post 2x12 beams and 2x10 joist whith a hot tub going on it about 3,000 lb. and I'am wondering how much this might settle?

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Old 07-27-2012, 08:26 AM   #2
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If done properly... NONE, a foundation should NOT settle.

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Old 07-27-2012, 09:14 AM   #3
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Robertcdf is correct, a properly designed and installed foundation will compress slightly when loaded (at least the wooden post will compress slightly), but the concrete pier itself should have virtually unmeasurable settlement. Of course, if the foundation is not properly designed, or is improperly installed, substantial settlement can occur. There is an entire industry devoted to repair of improperly built foundations.
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Old 07-28-2012, 04:03 PM   #4
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If I understand correctly this is an existing deck you are looking to put a hot tub on? the foundation must be designed based upon the loads it must support and the bearing capacity of your soil. If your footings are undersized then your deck will settle. If your deck is existing and it was not designed for a hot tub you should have someone local that is knowledgeable (architect, professional engineer or contractor) come to your site and perform an evaluation before installing a hot tub. The reason I say local is they can perform a better evaluation than someone on an online forum because they can observe all existing conditions (including excavating down to the bottom of the foundation to determine the size of the footing and the type of soil).

if your deck is at ground level (or slightly above the ground) you may want to consider putting in a concrete slab to install your hot tub on.

Good luck!
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