Perlite or Vermiculite

[plokuta]

Which is better to fill the area between the oven and the outer structure, perlite or vermiculite?

[agrasyuk]

The one you can source cheaper. There will be no measurable difference one vs the other

[UtahBeehiver]

Several builders who have dry poured P or V have blocked out the corners of the structure (with left over sheet rock or backer board) to reduce the volume of dry P/V in the corners where it is not needed.

[plokuta]

Thanks. They are both around the same price. Amazon - free shipping. The gap between the oven and the structure wall is not that far. I want to be able to cover the dome up to the roof peak.

[david s]

Several builders who have dry poured P or V have blocked out the corners of the structure (with left over sheet rock or backer board) to reduce the volume of dry P/V in the corners where it is not needed.

Or use empty plastic bottles with their lids screwed back on.