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Old 06-07-2011, 09:35 PM   #1
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Reinforcing Deck for Hot Tub


Hello all knowledgeable construction folk,

I have a 12 x 18 foot deck attached to my house with lags through the rim joists and sitting on two posts at the far end. The joists are 2x10's spaced 16" OC spanning the 12'. The decking in 2x6 redwood. I would like to place a 4000# jacuzzi (jacuzzi and water weight) and be able to handle say 800# of human beings so roughly handling 5000# over a 5x6 foot base (30 s.f.). So that brings my dead load to about 166 # / sf according to my calculations. I am wondering if there is any way at all to reinforce the deck to handle this weight without having two posts and a beam underneath the deck since this would look rather odd to me. Of course it would look less odd than my deck in splinters and my dead carcass intertwined within. One corner of the deck sits in a corner of sorts created by a bust out of my living room so I could also lag or bolt that joint to the rim joist for extra insurance against lateral movement.

I was thinking of doubling the floor joists, lagging or bolting the hell out of the rim joints and adding lateral bracing to the posts to prevent sway. My buddy did this and did fine with the same deck construction (famous last words?). I canít seem to locate a chart to tell me if this meets floor joist span requirements since if it does not I guess I have no choice but to go beam and post.

Hope this makes sense and thanks in advance for any input.

Joe

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Old 06-07-2011, 10:32 PM   #2
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Reinforcing Deck for Hot Tub


I don't see retrofitting a hot tub on the existing deck. Either put the tub on a deck engineered for the weight or cut a hole in this deck, reframe around the tub and put the tub on the ground.

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Old 06-08-2011, 11:58 AM   #3
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Reinforcing Deck for Hot Tub


How high off the ground are you? Unless you plan on rebuilding your current deck, I would cut a hole in the existing deck and drop the hot tub in on a separate platform, preferably a concrete slab beneath.
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Old 06-08-2011, 12:05 PM   #4
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Reinforcing Deck for Hot Tub


Contact an engineer or architect. Sight unseen, anyone who would tell you what to do is mistaken
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Old 06-08-2011, 02:30 PM   #5
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Reinforcing Deck for Hot Tub


5000 lbs on a wooden deck, what could possibly go wrong?
Ditto previous comments, either hire an engineer to design this for you or put the tub on the ground.
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Old 06-08-2011, 06:31 PM   #6
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Reinforcing Deck for Hot Tub


water, elect.. your going to need a permit anyway,BI is going to want to see drawings,footings
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Old 06-08-2011, 06:51 PM   #7
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Reinforcing Deck for Hot Tub


The deck is 10ft off the ground. So no chance a nice solidbeam across the joists with 2-3 posts set onconcrete pries then?
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Old 06-08-2011, 07:36 PM   #8
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Reinforcing Deck for Hot Tub


Quote:
Originally Posted by Joer189 View Post
]I have a 12 x 18 foot deck attached to my house with lags through the rim joists and sitting on two posts at the far end.
What size are the posts?

Last edited by AfterDinner; 06-08-2011 at 07:37 PM. Reason: HTML code showing up in post
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Old 06-08-2011, 08:22 PM   #9
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Reinforcing Deck for Hot Tub


If you really want to have it on the deck 10ft off the ground I would suggest 3 rows of double 2x12 beams sitting on 6 6"x6" posts directly under the hot tub 2 at each end and 2 in the middle. I would also set 2x10 joists 12 OC. Obviously, for the remainder of the deck you can span your beam posts as you normally would. Make sure to build in knee bracing for lateral support.

At no point should any weight of that tub be placed on the ledger board of the house/deck. It should be entirely resting on the beams.

Even then, double check with your local building department for their suggestions.

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Old 06-08-2011, 09:23 PM   #10
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Reinforcing Deck for Hot Tub


The posts are 10-12" diameter ponderosa pine logs, so they are pretty stout.
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Old 06-08-2011, 09:31 PM   #11
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Reinforcing Deck for Hot Tub


After dinner,
To clarify, the existing posts are the logs but I was going ot use 4x4 or 6x6's for the support posts under the planned new beam to run under the tub.

Thanks

Joe
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Old 06-08-2011, 09:50 PM   #12
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Reinforcing Deck for Hot Tub


something to think about is, does the tub have a uniform load of the 166 psf or does it only bear on the perimeter of the tub frame?

I can take a pic of my neighbors deck, it was a wood deck on a second floor, they bought and stuck a hot tub on it without having the deck checked out. Well the wood did not fail but the footing it was above dropped almost 4" they took off the tub but the deck now looks like it will be falling off any day now!
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Old 06-08-2011, 09:59 PM   #13
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Reinforcing Deck for Hot Tub


I agree with those saying to seek an engineers advice, get plans drawn up, permit for the work, electrician, and have the darn thing inspected and passed by your local building department.
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Old 06-09-2011, 01:40 PM   #14
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Reinforcing Deck for Hot Tub


Quote:
Originally Posted by Joer189 View Post
The deck is 10ft off the ground. So no chance a nice solidbeam across the joists with 2-3 posts set onconcrete pries then?

maybe,but no one here knows your soil or site conditions are,so no one can say how many or how deep or how wide they need to be

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