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!
Joined: May 30, 2009
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.
Joined: Oct 02, 2012
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.
Joined: Apr 13, 2012
Location: Kansas Zone 6a
OH, that is so good. Cowboy tub with class. and efficiency.
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