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:

http://i1073.photobucket.com/albums/w392/stkelly/Deck.jpg

Thanks!

~Scott