4.4. Structural layer waiting on insulating layer.
Prepare the insulating concrete using a ratio of 5 parts
vermiculite to 1 part Portland cement (5:1). Thoroughly mix
the vermiculite and Portland cement when they are still dry,
then add water and mix until you reach an oatmeal
consistency. Pour the insulating material to the top of the
form.
If you will be building a landing in front of your oven
opening, it is not necessary to pour vermiculite concrete all
the way to the front of the hearth. Rather, you can end the
form where your oven vent will begin, and only pour
vermiculite directly under the oven chamber and vent area.
Fill the form under the landing in front of the oven with
standard concrete (Photo 4.6).
4.5. Insulating concrete on top ready to cure.
4.6. Vermiculite concrete poured under the oven chamber.
Tips and Hints
We recommend mixing your vermiculite concrete by hand,
rather than in a mixer, which tends to break the vermiculite
up and reduce its efficiency. It is a light mixture that is easy
to work with. Dry mix the vermiculite and Portland cement,
so that the cement covers the vermiculite, then add water
until you reach an oatmeal-like consistency.
Pompeii Oven Instructions
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