Hot Tub Forum

Original => Hot Tub Forum => Topic started by: Damifudo on November 03, 2013, 08:23:19 am

Title: Building support under a 325 gal Hot tub 1Man +5 Woman Tub LOL
Post by: Damifudo on November 03, 2013, 08:23:19 am

Ok so I have a 16 x 20 Deck on my house through bolted leadure board with 2 1/2 carriage bolts every 24 inches. 12 feet from the house is a beam supported by 2 2x10s with 6x6 post  5 feet apart.

My plan is to sink (4) 30 inch deep footers 16 diameter then post to a cross beam 4x6 beam.  I will add 4 more 2x10s to double up my joist to my 2x10 joist that are existing.  So there will be a post under each corner of the hot tub sitting on a footer.

My question is can I use 4x4 post under the tub or do I need to go with 6x6 post.  I have 4x4s already and would like to use them and I think it will be adequate support but I want to be sure?  I also have a long 4x6 for a beam or do I need to use  2x10s bolted together?  I believe us using up what you have instead of buy more if it is enough support.  yes I am cheap like that .   :P

Thanks for your input this is my first hot tub DIY project.

Oh the deck is about 6 feet above the ground on the down hills side.  I can also do cross bracing.   

Title: Re: Building support under a 325 gal Hot tub 1Man +5 Woman Tub LOL
Post by: bob snader on November 03, 2013, 07:37:20 pm

4x4 will be fine.
See the wood calculator:

https://courses.cit.cornell.edu/arch264/calculators/example7.1/index.html (https://courses.cit.cornell.edu/arch264/calculators/example7.1/index.html)