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Classic:
I am in kind of a time crunch here. I recently bought a Jacuzzi Premium 375 (which is 91" x 91") and am having a deck built around it, I hired a deck guy who has installed spas before, but after seeing the latest installment, I am a little nervous. First they poured a 4" concrete slab, which I thought was great, but now he has to raise the hot tub to match where the new deck will meet it, as the new deck is one step down from my old deck, and a continuation, and the top of the hot tub will be flush with the new part of the deck. So, he put 3, what looks to me like, 1 x 4's one way and then crossways and on top of that he put 3 big, I guess 4x4's (maybe even 6x6's) they look like big thick posts lying flat, and then the hot tub is resting on those, these are spaced one in the middle and one on each end. I am worried as this does not provide a complete surface for the underside of my hot tub and this may not fully distribute the 5,000lb filled weight properly. He said that he does a lot of D1 spas, and this is how they recommend to do it....what do you think I should do? I don't want to ruin the hot tub or void the warranty !!

thanks in advance,

Brian

autoplay:
I think you should seek guidance from the spa deceptionist. He knows everything,just ask him.

ZzTop:
Hi Brian
I would suggest four 4x4 or 6x6 and a sheet of 3/4 or 5/8 plywood underneath the spa would be safer support.

I would also use pressure teated wood or use a wood preservative on all the wood including the plywood.

Let us know what you decide

Regards, Zz

ebirrane:
Egad.  :o

Check with your dealer on this one regarding what supports will and will not play into the warranty.  

I own a grandee (100" x 91") from hotspring which, when wet, weighs 6k lbs. and was told, in no uncertain terms, that it has to sit on a concrete slab.

I built my own slab, which was 6" thick with a 1/2"rebar grid in it and poured some footers as well, but I was in an odd spot regarding spa placement.

The reason I built the slab was because I was told that for certain models, and the grandee was one of them, *only* a slab or a properly reenforced deck would house the tub correctly.  5000lb is less heavy than 6000lb, but I would still check.

For lighter tubs, I have seen railroad ties used to support the tub, so long as the ties are positioned to hit the "support points" for your tub.  Just make sure it is pressure treated.

Good luck!

-Ed

twok99:
With the Jacuzzi ABS pan you will need to have a flat surface.  A thick piece of plywood may be sufficient but you will need it to be treated since it will get wet.

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