[Cob] supporting a one ton tank

[john fordice]

Ocean,
Alto I've not personally tested cob for compressive strength, I've  
heard values in the 200 psi to 350 psi range.
Concrete typically tests out at 2000 psi minimum and can be mixed to  
be much higher.
So, cob is about 1/10 as strong in compression as concrete.
john fordice
...........................

On Jul 6, 2011, at 11:25 AM, Ocean Liff-Anderson wrote:

> Actually, cob has incredible compressive strength, similar to a  
> concrete wall.  I don't know the numbers - Shannon, can you pitch  
> in some figures?  But I think the walls circling a small bathroom  
> and closet, if made thick enough, would be able to support your  
> water tank.  But best to get some engineering...
>
>
>
> On Jul 6, 2011, at 11:07 AM, Damon Howell wrote:
>
>> I want to incorporate a water storage tank in the attic of my  
>> house plans and use gravity fed water. I already have a 300 gallon  
>> tank which sits on a 6 inch concrete slab now. I figured when it's  
>> full it weighs 2,100 lbs. A cob wall cannot support that weight I  
>> think. So what are your thoughts on how to install this tank up  
>> there? What beam sizes for what spans? Is there info out there for  
>> this kind of thing? I was thinking since the bathroom is usually  
>> smallest and most in need of water, the tank could be supported by  
>> the bathroom and closet walls. They probably couldn't be made out  
>> of cob though. Feedback would be nice. Thanks, Damon in Georgia, USA
>>
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>
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