I built an outdoor oven, so I'll share a few thoughts.
0. Gas-fired ovens are a pain in the neck because the fire is over 1,000 oF,
which is just too hot for baking. And the burner is on or off, so you get
a lot of fluctuations, which is annoying and bad for your bread. Instead, use
something that will hold the heat, like stone. Heat it up, then turn off the gas.
Or, be SS and use wood. It's easier to find than you think and, if you must
buy, it's cheaper than propane.
1. Just use regular bricks. It'll last for decades instead of centuries. Old dense
over-fired bricks are best, but anything will do so long as they're actually fired
clay bricks and not just concrete that's been colored
2. Use lime-based refractory cement. The commercial stuff is 80 $ for a 50-lb
bag. A bag of slacked lime is 5 $ or so.
3. Use vermiculite or rock wool for insulation---they're cheap. Don't use fiberglass,
which will flatten after the glue (holding those little glass fibers together) melts.
4. Minimize features, like a roof, and outdoor electric wiring, because they add
a lot of expense.
5. Make the oven tall enough for the cook to see the back of the oven without
bending over. Sounds unncessary, but you'll thank me.
6. Try to make it look nice. An oven is somewhat permanent, so either put it
out of the way or try to make it look good enough that you don't constantly
feel like you should be making excuses for it.
0. Gas-fired ovens are a pain in the neck because the fire is over 1,000 oF,
which is just too hot for baking. And the burner is on or off, so you get
a lot of fluctuations, which is annoying and bad for your bread. Instead, use
something that will hold the heat, like stone. Heat it up, then turn off the gas.
Or, be SS and use wood. It's easier to find than you think and, if you must
buy, it's cheaper than propane.
1. Just use regular bricks. It'll last for decades instead of centuries. Old dense
over-fired bricks are best, but anything will do so long as they're actually fired
clay bricks and not just concrete that's been colored
2. Use lime-based refractory cement. The commercial stuff is 80 $ for a 50-lb
bag. A bag of slacked lime is 5 $ or so.
3. Use vermiculite or rock wool for insulation---they're cheap. Don't use fiberglass,
which will flatten after the glue (holding those little glass fibers together) melts.
4. Minimize features, like a roof, and outdoor electric wiring, because they add
a lot of expense.
5. Make the oven tall enough for the cook to see the back of the oven without
bending over. Sounds unncessary, but you'll thank me.
6. Try to make it look nice. An oven is somewhat permanent, so either put it
out of the way or try to make it look good enough that you don't constantly
feel like you should be making excuses for it.