screekliving Posted October 15, 2020 Report Share Posted October 15, 2020 I have constructed a hot tub foundation using 4x6's around the perimeter. This will leave the center well of the hot tub un supported. Is this an acceptable way to support the hot tub or should cross members be used to support the center well? Quote Link to comment Share on other sites More sharing options...
Cusser Posted October 15, 2020 Report Share Posted October 15, 2020 I would assume that most spas are manufactured so that the bottom of the "tub" would sit on a flat surface. So I say add the cross member supports, sure cannot cost much ! My own spa sits on a concrete patio, so I have no direct experience with this, and cannot remember what the underside of mine looks like... Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted October 15, 2020 Report Share Posted October 15, 2020 YES it needs support! Add in the cross braces and then fill the voids in between with limestone screening and tamp it down so it is flush with the top of the wood so the entire bottom of the spa is supported and critters can't make home under the spa. 1 Quote Link to comment Share on other sites More sharing options...
screekliving Posted October 15, 2020 Author Report Share Posted October 15, 2020 Thank you for the input. Quote Link to comment Share on other sites More sharing options...
PNW Soaker Posted October 18, 2020 Report Share Posted October 18, 2020 Yea you have to support the entire bottom because you don't really know where the load is being carried, it depends on the spa shell shape etc. Quote Link to comment Share on other sites More sharing options...
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