Does anyone know if you can use a vermiculite board to construct the oven floor?
It would give a lovely flat finish but unsure if it would work. And if safe for the food to be in direct contact with.
Thanks for your help
Hi, no you can't use it as the cooking surface. Vermiculite is insulating so it doesn't hold the heat which is what you need for your hearth. Be great with firebricks on top though and will give you that nice flat surface.
You are right that you don't need firebricks, but I can't recall a build that used ordinary building bricks for the floor. I used storage heater blocks as they are wide, not too thick, have a smooth side, and we're very cheap ! I laid them direct on the vermiculite board without any sand or screed, you could do the same with bricks if they are all the same depth. If you did lay a brick floor then I'd suggest using the herringbone method to avoid ridges at right angles to the tip of your peel; wider bricks mean less ridges.