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I am trying to determine the weight capacity of my outdoor

Customer Question
deck for a hot tub. Tub...
I am trying to determine the weight capacity of my outdoor deck for a hot tub.
Tub = 7.5'x7'= 52sqft 6500lb loaded and people
Deck = 10ft joist span + 2ft cantilever
2x10x12 joist, 16" o.c.
4x4 post spaced 6' apart at 10ft from house
Single beam at 10ft 2x12?
do I need more reinforcement
Submitted: 2 years ago.Category: Structural Engineering
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Answered in 4 hours by:
9/18/2015
Structural Engineer: StructuralEng, Consultant replied 2 years ago
StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7,387
Experience: Structural Engineer
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Hello. Does the hot tub load the deck at the four walls only?

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Customer reply replied 2 years ago
The deck is 12' x 40'. The spa will occupy the first 10 feet of the deck (2' border area. Surrounding it) two of the corners of the spa will load directly on the posts.
Does that answer your question?
Structural Engineer: StructuralEng, Consultant replied 2 years ago

I will assume it loads the deck at the walls only.

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Customer reply replied 2 years ago
I am not sure I understand the question. The deck is 12'x40' with the spacing and spans as listed. The spa is 8'x7'. It will be centered (the 8' part) witchin the 12' of deck. The width will occupy 7' of the 40'. Located 2' from the end. I would say it is loading the part attached to the house. And the first 2 posts. One edge will be located directly above the two posts. The part closest to the house will be located 2' from the house over the joists only. The remaining 31' of deck will have only light loading.
Structural Engineer: StructuralEng, Consultant replied 2 years ago

2x10 are too small to span 12' supporting the tub. You should use 2x12 under the are with the tub and triple the two that are directly below the hot tub walls and parallel.

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Customer reply replied 2 years ago
As in the first post the span is 10' not 12'. The beam is located 10' from the house wall (ledger). There is a 2' cantilever of which non of the tub will be contacting.
Customer reply replied 2 years ago
Sorry I meant joist span not post. Joist span is 10' 16"oc. Beam is (2) 2x12. Posts are 6' apart at 10' from the ledger. Hence a 10' joist span.
Structural Engineer: StructuralEng, Consultant replied 2 years ago

Then you can double the 2x10s directly under the walls of the hot tub

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Customer reply replied 2 years ago
Can or must? Can you estimate what is the max load in psf given the information I have given you?
Structural Engineer: StructuralEng, Consultant replied 2 years ago

A psf load rating is not meaningful because the hot tub doesn't load the deck uniformly. It loads it with four line loads. You must double those joists

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Structural Engineer: StructuralEng, Consultant replied 2 years ago

Hello. Do you have any other questions on this topic? If you could rate my answer, I would appreciate it.

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