I'm working on my design and procuring materials for an all-masonry offset smoker, and I'm wondering about a couple of things, hoping someone can give me some advice. My plans are currently to use 4" thick CMU blocks for the internal structural walls with a brick veneer on the outside, and on the inside use firebrick on all of the heated surfaces.
1) Firebrick - my local brick supplier has 2 thicknesses - 1-3/8 inch and 2-1/4 inch. I'm thinking about using the thinner firebrick for the smoke box and the thicker firebrick for the fire box, just to correspond with the temperatures that I would expect to see when the unit is in operation. Does that sound like the right sort of logic, or do I need to re-think this?
2) Mortar - should I be using refractory mortar for the firebricks, or a portland cement / sand / fireclay 1:1:1 mortar? What about for the structural CMU block - just use regular masonry mortar?
Thanks for your help, I'll start posting some photos soon.