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Old 08-03-2015, 06:20 PM   #1
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Stand alone hot tub deck, is it sufficient?


Here's the 8x8 deck I constructed to hold my hot tub. Is this construction sufficient to hold this load?

9 10" footings with 6x6 posts, three triple 2x10 beams and 2x10 joists at 12" on center. Cross bracing is 2x6.

Should I add more cross bracing?
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Stand alone hot tub deck, is it sufficient?-20150802_161941.jpg   Stand alone hot tub deck, is it sufficient?-deck-2.jpg  

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Last edited by Copgtp; 08-03-2015 at 06:23 PM.
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Old 08-03-2015, 06:58 PM   #2
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This is an internet chat forum comprised of people who you have never met, will never meet, with wildly varying backgrounds and experience. You are asking a structural question with potentially serious consequences if you get the wrong answer and run with it. I suggest you discuss this with your building inspector, or perhaps the manufacturer of the hot tub, or a structural engineer, or an architect. Someone who can look at your deck and hot tub, and accept responsibility for their opinion.

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Old 08-03-2015, 07:03 PM   #3
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Thanks Dan, I totally understand the implications of getting this wrong. If I had the money to hire an architect or an engineer, well, I wouldn't be in a DIY chatroom.

Your reply can, and does apply to EVERY DIY job , ever. Whether it's redoing a roof, building a patio, etc etc.

I'm simply looking for others who have constructed something similar, or have any experience in this type of structure.
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Old 08-03-2015, 07:12 PM   #4
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I'm no engineer, but that looks scary to me...


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Old 08-03-2015, 08:18 PM   #5
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Quick question, how big is your hot tub? If it is any more than 6 bye 6, your deck will NOT be big enough for you to comfortably use the tub. Ron
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Old 08-03-2015, 08:18 PM   #6
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Dude, call NASA, they could use a launch pad.
Really, that's a way over kill....This wasn't even calculating the joist.

Thank you for using the John Bridge Forums Deflect-O-Lator :-)
For joists that are SYP or Douglas Fir, in good condition, 9.25 inches tall, 4.5 inches wide, 12 inches on center, and 4.5 feet long between supports, the deflection calculated is 0.003 inches.
This translates to a deflection of L / 15474.
Since the maximum deflection for tile is L / 360, and for natural stone is L / 720, your floor is rated for Ceramic tile or Natural stone, Congratulations!


http://www.johnbridge.com/vbulletin/deflecto.pl

http://www.johnbridge.com/vbulletin/deflecto.pl

Last edited by ron45; 08-03-2015 at 08:29 PM.
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Old 08-03-2015, 08:37 PM   #7
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Okay, I'm over the initial shock...

The board that runs the face of the joist needs 3 nails per joist.
Still can't think. You do realize that your whole house could be centered on that structure right.?
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Old 08-03-2015, 09:03 PM   #8
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Thanks guys, as you can see I'm an over-builder! I was concerned about the dead load of the hot tub with water, plus a live load of 4-5 people. This platform will not be visible once the project is done. My deck will run along the sill plate of the house, effectively "sinking" the hot tub about 10-12" into the deck.
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Old 08-03-2015, 10:41 PM   #9
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Quote:
Originally Posted by Copgtp View Post
Here's the 8x8 deck I constructed to hold my hot tub. Is this construction sufficient to hold this load?
To calculate that would require...the load. How much does the thing weigh soaking wet, do you know? It's not the dead load--I think that could hold a rail car. Thanks for the laugh.

You are going to put some stairs, and some really sturdy railings on that, right?


Quote:
Should I add more cross bracing?
Other questions I would like to hear, "Are nine footings enough?"

I'm more concerned with the height of the platform, what happens when water in the tub is sloshing around with a full occupant load. The grade issues bother me for some reason--and surprisingly--I do have a problem with the bracing. Z-brace, top-to-top, top right to bottom left, bottom across.

Daniel's comments hold true, and no one here, engineer, or otherwise can certify something over an Internet forum.
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Old 08-03-2015, 10:42 PM   #10
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That's a little high for a step.?
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Old 08-03-2015, 10:55 PM   #11
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How big of a hot tub are you planning on?
I don't know how a top heavy, dynamic load, will not cause this to fail.
I would have attached it to the house to eliminate the free standing aspect of the deck.
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Old 08-03-2015, 11:00 PM   #12
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There won't be a step or railing on this platform, when the hottub is on it, and the actual deck is up, you'll never see this platform unless you're underneath.

As far as the z bracing, that's a good idea, I think I will do something like that.
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Old 08-03-2015, 11:09 PM   #13
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Is this part1 of additional decking you're putting up?
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Old 08-03-2015, 11:20 PM   #14
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Yes, this is the first phase. The actual deck will be built around the hot tub. Hot tub is 6x6
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Old 08-03-2015, 11:31 PM   #15
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Filled weight of the tub is 2700. Plus 1200 in people, that's 3900.

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