interlock The Casa2G Series ovens feature an interlocking dome design -- the same design featured in our high-end Modena Series commercial pizza ovens. The dome pieces fit tightly together, making assembly easier and giving the Casa2G ovens better heat retention and better durability. Other wood-fired ovens use a much simpler design, where the dome pieces butt loosely together -- leaving large gaps in the dome that have to be patched with mortar.