The floor of the firebox together with the protective floor extension in front of it.
This has two parts our inspection checks separately: the inner hearth, which is the firebox floor, and the hearth extension, the non-combustible projection that runs out in front of the firebox. IRC sets the extension depth at a minimum of 16" for fireboxes under 6 sq ft and 20" for anything larger, and we measure it against that.
We work on hearth every week across DFW. CSIA-certified, written quotes, financing available.
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