This seems like a little too much steel, so I am trying to design the firebox differently. I can't use 10 or 12" block due to size limitations therefore I would need #8 rebar spaced at 8in o.c. The problem may be that I am trying to design the bottom firebox 8inch CMU wall section to resist the total bending moment per foot created by lateral load to the chimney & firebox. I don't have a problem with the overturning since I sized the footing to account for this. RE: CMU Fireplace & Chimney shacked (Structural) Just curious what some of your thoughts are? This is supported on a 13in thick conc slab.īut for the firebox I can't seem to make 8in CMU work due to the large overturning moment at the base, so now I am thinking that the whole firebox should just be poured in place concrete with a masonry chimney. I am using light weight 6in CMU for the chimney and based on seismic loads (Seismic design cat D)I am using #4 8" o.c. Since I do not do a lot of this type of design I just wanted to get some thoughts on what my calculations are coming up with. The firebox is 6ft tall x 7ft wide x 33 inches thick with a 3ft wide x 19 in thick x 7.5ft tall chimney on top and covered with 1.5in stone & 1in mortar mix. I am working on a project for a client that has a design from a landscape Architect that calls for a freestanding fireplace for their residence.
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