[Cob] Attaching concrete roofing tiles to cob walls

[Scott Alexander]

Ianto Evans attaches a wooden board on top of the wall as a nailing backer.
the pictures are of a large file size and may take some time to load on a
slow connection, but the third picture from the bottom on this page is a
good example: http://www.seapotentialdifference.com/cob/0908/walls.htm

S~



On Tue, May 10, 2011 at 6:38 AM, Hugh Withycombe <hughali at webone.com.au>wrote:

> Hey there to cob world
> I have a question about getting concrete roofing tiles to stay attached to
> the top of cob walls.  My family and I have built a garden wall, with bench
> seat, windows and arched gate as an introduction to more complex cob
> projects.  Now that we are starting to get regular morning frosts (Canberra,
> Australia) the curved concrete roofing tiles with which I have capped off
> the walls have detached.  I bedded them on with a slightly clay rich, straw
> poor mortar mix which adhered well during the warmer months but differential
> thermal expansion seems to have broken them free.  They were stuck with
> about a 20 degree pitch and even loose the weight still seems to hold them
> in place.
> So, should I worry at all or can someone suggest a better fixture?
> Hugh Withycombe
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Thank you!
~
Scott Alexander
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