perlite / vermiculite

[danqui]

so i didnt find out yet how i will mix one of them with the concrete for my oven floor, what mixture of concrete should i use and how much of the perlite/ vermiculite
do i use common cement???

how about the mortar for the dome...

[Neil2]

Re: perlite / vermiculite

Don't use this for your oven floor. This is the insulation layer and goes between the structural slab and the oven hearth bricks.

I used an 8:1 mix. 8 Vermiculite to 1 normal Portland cement.

[danqui]

Re: perlite / vermiculite

so how much vermiculita will i need, they sell here ten kilo so is that enogh?