[Cob] plastic jugs in walls?

[john fordice]

Jill,
Good info!
Do you know what the thickness of the /cob/rubble/cob/ composite was  
in the buildings which failed?
john fordice

On Dec 10, 2009, at 11:57 AM, Jill Hogan wrote:

> The strength of a cob wall is that it is monolythic. Edges are  
> weakness. In the severe 1969 earthquake in the Western cape houses  
> in Ceres fell as they had rubble down the centre of their walls as  
> insulation.
> Regards Jill
>
> john fordice wrote:
>>
>> Tys,
>> I'll venture to say (without really being able to prove it) that  
>> it will weaken the wall.  A cob wall gets it  strength by being  
>> thick.  A structure resists forces acting on it by being made as  
>> continuous as possible.  Making a void in the wall will create a  
>> weak spot which compromises the continuity of the structure.    I  
>> would not do anything which creates voids in the cob based on this  
>> reasoning.
>> john fordice
>>
>> On Dec 10, 2009, at 10:07 AM, Tys Sniffen wrote:
>>
>>> So, as my walls get up over 7 feet high, I'm starting to remember  
>>> how lower
>>> down, when I had them laying around, I would toss in the  
>>> occasional urbanite
>>> chunk to take up some space.
>>>
>>> Now I'm starting to think about tossing in some one gallon  
>>> plastic jugs
>>> (vinegar jugs, that are slightly thicker plastic than the common  
>>> 1 gal milk
>>> jug) again, to take up space, but also I'm thinking having a void  
>>> in the
>>> wall that size could insulation in a way, and, of course, would  
>>> make my tall
>>> parts a bit lighter.
>>>
>>> Does that sound like a bad idea to anyone?
>>>
>>> Tys
>>>
>>>
>>>
>>>
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>>
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>