4. Pouring the Hearth
Overview
In this step you will pour the concrete hearth and then either
install FB Board or pour a second layer of insulating
concrete.
Instructions
For installations using FB Board, mix and pour the 3 1/2”
concrete heath.
4.1. Rebar set in center of the concrete pad.
You can place the FB Board on the concrete hearth at any
time—while the concrete is damp and still curing, or after it
is fully cured. The weight of the oven will hold the ceramic
fiber board in place, and you do not have to use adhesive.
4.2. FB Board on damp concrete.
For installations using insulating concrete and a 7 1/2” form,
draw a line 4” down from the top of the frame to mark the
top of the structural concrete layer.
Double check that you have a grid of 1/2" rebar slightly
shorter than the external dimension of the wood forms, on
12" centers, starting 6" in from the edges of the form, set
half-way up the 3 1/2” concrete layer (about 1 3/4”). Then,
pour the 3 1/2” layer of structural concrete. See Photos 4.3
and 4.4.
4.3. Rebar set in center of the concrete pad.
Pompeii Oven Instructions
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