I have come to the point where I am laying my insultaion slab and have a few questions. I have my foundation done as well as the base and now have come to the part just below the hearth. I found on another website(heatkit.com) that when a guy used the vermiculite, he used a 6:1 ratio with cement. When doing that, what consistency should it be because the pictures still seemed pretty grainy/gritty. Do you mix it with water? Also once the inslutaion slab is layed, do you put the concerete base on top of that or under the vermiculite? If the insulation is below the concrete and not directly under the firebricks, what are you insulating? Thanks for all the help.
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