They seem simple enough to build, but one thing I would like to know is:

The standard brick is 230x115x76.

bottom is no problem if you want to make it wider than say 230, but for the top how do you support the bricks so that they dont fall in if you wanted to go wider to say 2 or more bricks?

I am guessing a lintel is out of the question due to temperatures....lol


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