[Cob] Cob on a reciprocal roof

[David Thurman]

I had a question in regards to this thread, is Cob viable as a roof material
 in reference to earthquakes?  I don't have enough Data to establish that as
being true, but if someone can point to the engineering on that I would
greatly appreciate it. I've only seen engineering on Cob in application
vertically, not horizontally.
Cheers
David Thurman



On Fri, Jul 1, 2011 at 7:48 AM, Jill Hogan <jill.hogan at mat.org.za> wrote:

> Hi Matt I built my roof of cob and lime rendered it.I live in the Karoo a
> semi desert arid area in South Africa and the huge variance of temp from
> night and day and summer and winter there is expansion and contraction so we
> get cracking. We take our lime render water it down with prickly pear juice
> and then use it as a paint once a year before the rains and it seems to be
> working. This year we have had unsual amounts of rain and we have had to do
> it more regularly, but am still testing you can see pics of the roof on
> www.mat.org.za
> Regards Jill
>
>
>
> On 2011/07/01 01:30 AM, Matthew Caswell wrote:
>
>> Hi,
>>
>>         I'm building a cob house in the structure of a honeycomb
>> (hexagonal rooms) and for each room I was planning on having
>> individual roofs.  These roofs would be reciprocal, for the strength
>> (and ease of construction).  However, I do not plan on having
>> electricity in my home and am instead hoping to use cob oven(s),
>> torches, and the sun for light (reciprocal roofs have holes in the
>> middle so that would be my smoke hole).  I would be more comfortable
>> slapping cob on the roof frame (instead of wood) to help counter
>> possible roof burning scenarios.  Could cob stay on the roof while
>> drying, and would it survive the rain (I live in a rainy climate and
>> would probably have to attach wooden shingles)?
>>
>> Thanks,
>>   Matt
>>
>>
>
> --
> *Jill Hogan*
> McGregor Alternative Technology Centre "MAT"
> PO Box 365
> McGregor
> 6708
>
> www.mat.org.za <http://www.mat.org.za>
> Phone: 023 625 1533
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