Good question. It's not needed. The fire brick serves as an extra layer that protects the support walls. The floor is not structural. Moreover, I haven't had any issues in years with my fireplace floor nor heard of any.
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Please check our website for prices. We have many options. Our most popular models can be configured and priced in real-time here: cornerstone.rocks/store/#!/Outdoor-Fireplace/p/486143251/category=0
