You are reading a single comment by @sausagefingers and its replies. Click here to read the full conversation.
  • Has anyone here back-filled a cast iron fireplace with vermiculite?

  • Has anyone here back-filled a cast iron fireplace with vermiculite?

    Yes.

    Not just loose vermiculite tho, It's mixed with a slurry of cement/water which solidifies it.
    (I couldn't tell you the ratio tho, it was ages ago and we pretty much winged it.)

About