Hello all! This is my first post of hopefully a bunch of conversation. I started building my pizza oven almost a month ago and I am at the point of making the actual oven part. I built the back wall and the cooking area utilizing furnace cement. Reading a little bit more I’m not sure if that is safe. Please let me know if you can if this is safe or if anybody else has done so in their’s.Thank you so much for any input I truly appreciate it! Please see below to a few pictures of where I have used it.