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Discussion Starter #1
Last year I was able to extend our deck and push out the gazebo to meet up with our new pool. This year I want to put a hot tub in our gazebo. Everything is tied the existing deck, with (9) 4 x 4 posts (treated wood) that are in the ground 36" and about 36" above ground under the gazebo. I also have (4) 4 x 4 posts on those cement deck supports under there as well. The filled weight (including 4 occupants) of the hot tub is 3,800 pounds. Do you think I have enough support under the gazebo to support the hot tub filled. I have 2 x 6 supporting the floor under the gazebo.
 

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Got a picture?
Both 2 X 6's and 4 X 4's are unexceptable.
That would be the bare minumum and would not even meet code in a lot of places for a basic lightly loaded deck.
 

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I have 2 x 6 supporting the floor under the gazebo.
let's see if I've got this correct .....

you want to place a hot tub with a total weight of 3,000 lbs onto your deck.
your deck is framed with 2x6 joists
you want to know will the deck support the weight of the tub and occupants

and joe is correct, do you have any photos and if so, could you mark where you want the tub
 

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I did see just one done this way, within a few days that had a ground level tub when it fell through the deck.
 

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He had that going on and someone that had built the porch roof had about a 2 pitch, had just nailed the rafters right through the fashia, and spaced them 24" on center, and used shingles on the roof.
 

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oh well, workmanship like that creates more work for craftsmans
 

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All he wanted me to do was fix all the roof leaks.
When I told him why everything was leaking all he wanted to do was tell me a "pro" builder had done all the work, and that's not the reason.
Well if he's a "Pro" why did your hot tub fall through the deck and the roofs leaking.
 

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Discussion Starter #9
I was mistaken, I used 2 x 8's

I used 2 x 8's, along with the 4 x 4's. The posts are within 4 feet of each other. I can send pictures later. You don't think 9 posts within a 12 foot circumference is got enough? I thought I was doing good job, but maybe not.
 

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so your joists span 12', what is the spacing 16" o.c., 12" o.c?
 

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Discussion Starter #11
Correction

It's been awhile since I've been under the deck. So I went out to it in the snow & looked that I have 2 x 10 Beams, with 2 x 8 Joists on top of that, then the posts are no more than 4 feet apart (36" deep with about 36" above ground). Then the joists are 12" OC, because I have composite decking to finish it. I should have been more accurate in my first posting, sorry.
 

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what is the size of the hot tub? 7'x7'? is it going in the center of the joist span?
 

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Discussion Starter #13
Hot tub weighs 4,000 lbs. (w/people)

The hot tub is 66" by 66" and the filled weight (people included) is 4,000 pounds. Yes, it will be in the center.
 

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I would highly recommend installing a beam under the center of the deck (under the hot tub). if the hot tub is sitting on 2x8 joists (figured pressured treated southern pine since I don't know what you have) at 16" o.c. with 4000 lbs distributed over (66"x66"/144 = 30.25 s.f.) you will have a about 132 psf total load. This would be about 176 pounds per lineal feet of joist over the 5.5' (hot tub dimension). I do not think you'd like the results.
 
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