Layer 5 is a header course where the bricks go cross ways. The purpose of doing this is to add stability to the wall. I struggled to get this level as the hard brick on the inside isn't exactly the same height as the Insulating Fire Brick on the outside. I am also fighting a bit of a sag in the middle of the left side wall. It is not big, but enough to bug me.
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The next layer, 6, has the ports for adding the soda/salt. I am planning on using a sprayer and with the soda ash and/or salt dissolved. The ports are 3" x 3". The original design had ports only on one side of the firebox, but I decided to add them to both sides to give me a little more ability to get the glazing uniform.
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I do the same thing, start my documentation in the middle.
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