Cob: fibrous concrete reinforcement

[Amanda Peck]

Getting pounds of horse-hair (not mane or tail because it's too springy) 
seems like a hassle.  So if that's a good idea for a surface plaster/render, 
as it seems to be, the nylon or polypro fibers might be a good idea.  
Testing with a cheap nylon brush or polypro baling twine should give you the 
answer.  Hasn't Charmaine Taylor recommended a source of nylon fibers?

...............
Brad Calvert wrote:

http://www.toolbase.org/tertiaryT.asp?DocumentID=2112&CategoryID=1285

has some info about synthetic fibers added to concrete to reduce cracking.

Or maybe the fibers are too smooth and slippery for the render to grip?

Any thoughts?

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