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Anyone try a cob hot tub?

Rusty Bowman

Joined: May 30, 2009
Posts: 117
Location: Idaho
A wood fired hot tub has been on the back of my mind for a long time. Never thought of making one of cob though. Has anyone built one like that in the following link: https://www.facebook.com/photo.php?fbid=327390867313984&set=a.174879205898485.49813.147479555305117&type=1&theater

I'm thinking this could be a fun project!

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Darin Lightning

Joined: Sep 28, 2012
Posts: 1

I think it would work, if you coat the interior with poly-modified cement over your cob foundation and frame. Seems like the cob would be a good insulator, but you would have to transition the interior from the silt structure (that water will destroy) to the cement structure and coating. Not sure exactly how that would work, but if the cob frame were sturdy enough, it shouldn't be too much of a problem to do a tough and flexible concrete coating inside the tub. Probably keep it simple on the plumbing, and it should work like any built-in spa. I'm in Boise, too, so if you want to give it a shot, let me know and maybe I can help!
Rusty Bowman

Joined: May 30, 2009
Posts: 117
Location: Idaho
Thanks, Darin. For ease, I was thinking about putting cob around an old steel tub. Might not be as elegant as what I think you're describing...but I don't know that I'm that ambitious.

Any way, it's good to see another poster from Idaho. I'm in Twin.

Olivia Helmer

Joined: Oct 02, 2012
Posts: 69
Location: west marin, bay area california
there is a book written by becky bee that tells how to do it. I have never made one but i own the book and have pondered making one for a long time. I have been pondering making one with a metal water trough instead of a bathtub.
R Scott

Joined: Apr 13, 2012
Posts: 1825
Location: Kansas Zone 6a
OH, that is so good. Cowboy tub with class. and efficiency.

"You must be the change you want to see in the world." "First they ignore you, then they laugh at you, then they fight you, then you win." --Mahatma Gandhi
"Preach the Gospel always, and if necessary, use words." --Francis of Assisi. "Family farms work when the whole family works the farm." -- Adam Klaus
Jeremy Krieg

Joined: Nov 25, 2012
Posts: 8
the hot tub looks like i great idea,

I was wondering whether you had considered more of a rocket mass heater design , i would be so much more efficient

subject: Anyone try a cob hot tub?
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