My oven project seems to be coming along faster than I expected. The foundation was poured last weekend and I spent all day yesterday building the hearth and forming the hearth slab. I still have some more form work to do so that I can have a curved front section of the slab. I decided to use a precast lintel to bridge the hearth opening versus using angle iron. I put additional rebar in it provide extra strength to help support the hearth slab.