Cob fireplace making with cob

[Patrick Newberry]

What is the definition of a refractory lining? 

PS. I'm still going to make my pine/cob bricks and compare them with 
some wheatstraw bricks, just been slower than usual.

Pat
http://www.gnat.net/~goshawk
 

> Especially if there is a refractory interior lining, cob would then
> make a wonderful surround.  I would be sculptural, massive and very
> sustainable.
>