Horticultural perlite

[Mega]

Is this perlite ok to use and what if I wanted to insulate my dome after I have done my ceramic fiber blanket wrap can I still use the same mix ratio.

[UtahBeehiver]

5 perlite to 1 portland cement is the recommended ratio for floor insulation, a min of 4" thick.
I suggest you download and review the free Eplans from the Forno Bravo store.

[Mega]

Hi guys I'am an issue with the perlite that I bought for my oven insulation it said horticulture on it and I wanted to know if I could use it to mix with cement to make an insulation under the fire brick. Any ideas or advice will be greatly apreciated.