floor insulation Getting Started Discuss floor insulation in the Pizza Oven Design and Installation forums; does the vermiculite have to be mixed with concrete or can it be loose under the brick floor.Lay down the ...

[sumu]

does the vermiculite have to be mixed with concrete or can it be loose under the brick floor.Lay down the out line and fill with vermiculite add floor.

[dmun]

No, loose vermiculite won't work, it's fluffy, and will push right out of the way, or compress to uslessness if you tried. The portland makes it into a rigid layer under your oven floor which can't move or sag at the risk of cracking or worse.

If you don't want to mess with the vermiculite concrete, use a refractory insulation board.

[sumu]

so is this right 6 shoval fulls of vermiculite to 1 shoval full of portland cement then mix with water.and troll out.