#11  
Old 06-02-2013, 12:11 AM
brickie in oz's Avatar
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Default Re: cob + firebrick?

Quote:
Originally Posted by Jimney View Post
Has anyone ever used strawless cob as mortar for the firebrick?
Quote:
Originally Posted by cobblerdave View Post
Why bother to take a extra step in making the bricks when you can build the dome as a single unit in cob.
I think the question was about using clay for mortar.
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  #12  
Old 06-02-2013, 02:46 AM
david s's Avatar
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Default Re: cob + firebrick?

Quote:
Originally Posted by Jimney View Post
Has anyone ever used strawless cob as mortar for the firebrick?
By cob i presume you mean clay and sand mixed together without the straw.
Not so good. It's way too sticky- can't get it off the trowel.
It also shrinks too much, you'll have lots of shrinkage cracks.
The homebrew mortar is way better 3:1:1:1 sand, clay, lime, portland cement
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