Spa on Deck

tavertyFebruary 1, 2012

I know the usual answer to this question is "speak to a structural engineer." However, I am building a new deck and would like the possibility to add a hot tub in the extended future. We may never install one. I already spoke to a local structural engineering firm and they wanted ~$1,000 just to look at the plans. When I pull the hot tub permit later I'll need a structural engineer to sign off on the plans. I would just hate later if an engineer says, "You could have installed a hot tub if the footer was 1 inch bigger!"

I researched and ran some calculations to come up with footer sizes and I was hoping the community could take a look and let me know the plans look adequate to support a basic Costco tub I found.

Parameters I used:

2000 psf soil bearing capacity

130 psf for the entire deck

Tub details:

7'7" x 7'7"

4100lbs filled

See the plans at the following link:



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Here's the plans:


    Bookmark   February 1, 2012 at 4:12PM
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Consider pouring a concrete slab and designing the deck such that you can later cut away and install the hot tub more flush with the deck level.

    Bookmark   February 4, 2012 at 9:46PM
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We're required to design to 200lb/sqft for hot tubs or spas on a wood deck.

    Bookmark   February 5, 2012 at 4:37PM
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Sophie Wheeler

Money-gomery County, Maryland? You are NOT going to get around the red tape associated with having an engineer's stamp. Bite the bullet and pay for the consult now.

    Bookmark   February 6, 2012 at 1:40PM
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Thanks for the feedback. Wow 200lb/sqft? Snow country?

Yeah I hear you on the engineers stamp. And I have no intention of installing a hot tub without the engineers stamp and proper permits. The big issue I have with paying 750-1000 now is I may never install the tub.

Thanks again.

    Bookmark   February 7, 2012 at 12:30PM
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