[Cob] plastic jugs in walls?

[Jill Hogan]

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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