My main floor will be on a poured slab with the perimeter foundation being a poured 8″ wall going down below frostline to a continuous footing. Centered along my gable end wall will be a fireplace, and the continuous wall footing will enlarge there to handle the fireplace foundation. My question involves the typical cantilevered fireplace base slab formed and poured atop the fireplace foundation. The cantilevered part is for the masonry hearth. Since my adjoining floor is concrete slab on grade, is it still a good idea to cantilever a monolithic fireplace base slab out, so that there is no slab joint between fireplace and hearth?
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