[Cob] Mix

[Dorothy Cordochorea]

Dear Janet,

I just noticed your comment that you plan to make a cob cistern, and I am
curious.  How do you plan to line it to make it sufficiently waterproof to
work as a cistern?

--Dorothy

On Thu, Jul 22, 2010 at 12:53 PM, Shannon Dealy <dealy at deatech.com> wrote:

> On Sun, 18 Jul 2010, Janet Standeford wrote:
>
> Can anyone tell me how much cob, by foot measurement, that one bale of
>> straw weighing 110 lbs should make?
>>
>> BTW one of our projects this year if enough people show up will be a cob
>> cistern.
>>
>
> Cob is typically about 10% straw (by volume), assuming your bales are
> comparable to mine, your 110 lb bale is probably about 10 cubic feet of
> straw which works out to (very roughly) 100 cubic feet of cob.  This of
> course assumes a typical mix, some people push the straw content
> significantly higher for special purposes, and some people don't put enough
> straw in the mix.  If you are trying to figure out how many bales you need,
> get a number of extras.  There is not only variations in the mix to
> consider, but they also make good places to stand on as the wall gets
> higher, and can be stacked like bricks as the wall height increases.
>
> Shannon C. Dealy      |               DeaTech Research Inc.
> dealy at deatech.com     |          - Custom Software Development -
> Phone: (800) 467-5820 |          - Natural Building Instruction -
>   or: (541) 929-4089 |                  www.deatech.com
>
>
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