I have a question about pouring the hearth. I understand the first layer of the hearth is structural concrete, but for the insulating layer it says in the instructions to mix approx 5:1 portland cement and vermiculite. Looking at portland cement at my local home store, it states on the bag to mix the portland with a ratio of sand and aggregate. When doing the insulating layer, do you include this sand and aggregate or just the dry portland cement and the vermiculite.
Thanks in advance, and to all of those that make this a great site to learn from.
Thanks in advance, and to all of those that make this a great site to learn from.
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