I recently called a masonry supply house to see if they carried vermiculite. They said that the vermiculite I need is called "attic vermiculite" which is bigger in size than the standard (plant and garden) vermiculite that they and other home centers carry. Is this true and also when mixing with portland cement that I need to add sand so the finished insulated pad will not crumble. Need some info please. Does the portland cement that a Home Depot or Lowes carries have sand already mixed in (premix Quickrete). Am pouring the hearth tomorrow and would like to get my supplies ASAP. Also how much vermiculite is needed per bag.
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