connecting inner and outer arches
Ok, I've tried to find this explained in the archived threads but still not sure I understand. I have an inner arch that is made of firebrick and is basically fused into my dome. Actually it protrudes about 4 inches from the dome. I am going to build the outer arch of red brick and have it maybe a half inch wider than the inner arch all around.
I have read that you should mortar the bottom bricks of the outer arch to the floor. I don't understand if I should be motoring the bricks of the outer arch to the bricks of the inner arch. I read about a gap to prevent heat loss and also if the arches are mortared together the joints will break from heat differentials. So could I just have the outer arch bricks bump up against the inner firebricks and just not mortar them together?
If I do this I just don't understand what keeps the outer arch from flopping over, except the bond of the chimney over the created vent.
Re: connecting inner and outer arches
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