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Installing a hot tub - what PSI?
Posted on 8/1/26 at 2:26 pm
Posted on 8/1/26 at 2:26 pm
On top of a new patio deck project that starts next week. In the quote, it shows 3,000 PSI on the paving, but I see some sites recommend closer to 4,000 PSI to support the weight. Would you guys recommend I pay a little extra for stronger pavers? The concrete guy said 3,000 PSI would be more than enough.
5
Posted on 8/1/26 at 2:47 pm to rpg37
Why would you need more than 3000 PSI load-bearing capacity? Your hot tub filled with water will not exert more than 150 PSI.
Saying 3000 is more than enough is understating it unless I am missing something.
Saying 3000 is more than enough is understating it unless I am missing something.
Posted on 8/1/26 at 3:35 pm to rpg37
3000 psi is fine.
That’s 1 1/2 TONS per square inch.
You’re fine.
That’s 1 1/2 TONS per square inch.
You’re fine.
Posted on 8/1/26 at 3:55 pm to UptownJoeBrown
Appreciate you both confirming. Just articles I was reading....four inches depth minimum and 3000 PSI minimum and they were saying that could lead to cracking later.
Posted on 8/2/26 at 10:20 am to rpg37
Water weighs 8#/gallon baw. Add that to the weight of the tub and you got your number.
Posted on 8/2/26 at 12:14 pm to rpg37
Well actually, how thick are we going with it?
A driveway is 4 inches usually.
A driveway is 4 inches usually.
Posted on 8/2/26 at 12:16 pm to rpg37
It's not a matter of the weight of the tub, it's a matter of how that weight is distributed.
Posted on 8/2/26 at 5:36 pm to UptownJoeBrown
We are going 4" and 3000 PSI.
Posted on 8/3/26 at 3:10 pm to rpg37
It will not matter. We had some recent compressive tests fail and we hand-checked them. The actual required psi in a foundation is much lower than you would think.
Hell, I've gotten a lot of reports for 3ksi concrete that end up near or over 4ksi.
I agree from the design side. You should trust him.
Hell, I've gotten a lot of reports for 3ksi concrete that end up near or over 4ksi.
quote:
The concrete guy said 3,000 PSI would be more than enough.
I agree from the design side. You should trust him.
Posted on 8/3/26 at 3:13 pm to dragginass
quote:
It's not a matter of the weight of the tub, it's a matter of how that weight is distributed.
Also this. If it is evenly spread out for the full area of tub I wouldn't even think about it. If it's on a sled system that supports all of the weight along the perimeter I'd just add a shovel beam with (2) additional #5 continuous bars.
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