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What is the purpose of he brick? Is it for temp stability, or are you lining a firebox? If temp stability, you can use regular brick since it won't be exposed to high temperatures. If you are lining your firebox, then you will want to use firebrick.
Regular brick might smell funny the first time you heat it up. I use two where my firebox feeds the cook chamber to block some of the radiant heat (offset cooker) if the meat is near the firebox.
Hello. I've been having good luck using firebricks in my Weber kettle & Smokey Mountain Cooker. Before using bricks, the temperature in my grill wasn't anywhere near as stable as it is now.
I tried using typical red bricks from local hardware stores, but they snapped after so many cooks. I've also tried firebricks, fireplace inserts, & woodstove bricks, but they too snap & crack after so many cooks. However, the firebricks did last longer & seemed to provide the most stability. Elsewhere I've read that if you find a pottery place that specialises in ceramics, then they might be able to make better quality bricks for your grill or smoker. I'm attaching pics of bricks in my grills as visual aides. Hopefully, this'll help.