I am trying to build an oven per Alan Scott’s plans. The hearth was supposed to have two layers. The first was to have 2 inches of vermiculite mixed with portland cement in a 6:1 ratio. Then topped with 3.5 inches of concrete (to be then topped with fire brick)
My mistake was mixing concrete with the vermiculite vice the cement. And used it at 5:2 vermiculite to concrete… Ugh
Question is will the insulation properties be sufficient? Should i cut it all up and repour before i do the dome work?