hot tub base - low spot blues

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Old 11-06-20, 08:11 AM
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hot tub base - low spot blues

Hi all and thanks in advance for any input! I've recently poured a 10'x10' concrete slab in preparation for delivery of my very first hot tub next month. Unfortunately, the finished slab has a low spot which is just less than 1/4" at its deepest point. The two photos below show the area that I'm describing; one of the photos is a close-up of a 2x4 standing at the deepest point of the low spot. Importantly, I would note that the entire ~6-inch perimeter around the slab is just about perfectly level.
The question is whether this imperfection in the slab requires remedy, or if I'm dwelling on a non-issue. If it's a problem, how would you go about fixing it? Self-leveling concrete?
Thanks again.

the low spot is not really as large as the wet area in this photo.

that's a 2x4 standing in the deepest part of the low spot.
 
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Old 11-06-20, 09:01 AM
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Hot tubs are supported around the perimeter so that is not an issue. My hot tub has a thick plastic base covering the bottom and that wraps up the sides about 3" up the sides so the low spot would not be an issue.

I think you need to confirm how your tub is constructed!
 
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Old 11-06-20, 09:56 AM
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Look at the delivery prep packet for your spa or it's manual. It should describe where and how your spa needs to be supported. I suspect your 1/4" dip won't cause any problems but if that low area happens to be a support location for the spa you could put down a 1/4" thick aluminum plate or sheet of plastic. You could also use self leveling compound or a concrete topping mix to fill in the dip. But, I don't think it will be necessary. 1/4" isn't much and is probably better than most spa installations get.
 
 

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