Refractory Brick, Different Types???

[smrtgy123]

Hi there and this is my first post and I am a newbie so please excuse my lack of knowledge on many things here.
OK so I made my own pizza contraption out of steel and high temperature insulation. Here's my problem. Prior to this contraption I was making pizzas out of my home oven and used a 3/4" piece of granite as my Pizza stone at 550 F degrees. They actually come out really good but heated up the kitchen too much and took a little longer. So then I tried purchasing yellow refractory 2" thick bricks and used them for my stone. I preheated home oven for at least 4 hours and it never got hot enough to brown crust.
So I then loaded up contraption floor with the 2" refractory bricks and got the oven up to 800 for a few hours and still same thing. I then replaced the bricks with granite and it works excellent but the granite cracks in spots due to the high heat. What I am wondering is should I use 1" thick refactory bricks or are there different types of refractory bricks that get hotter than others?
Thanks in advance and any info is very much appreciated!

[smrtgy123]

someone please?

[splatgirl]

refractory brick, or fire brick comes in different duty ratings. Medium duty is what is recommended for the pompeii oven. It sounds like maybe you have either a high duty brick or an insulating brick...check out this link for good explanation:
Brick Oven Design | Choose the Right Brick Oven Brick

[smrtgy123]

thank you so much!