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Installation and
Operating Manual
Forno Bravo
Casa2G and Premio2G
Residential Modular Refractory Ovens
21
©Forno Bravo, LLC 2019. All Rights Reserved.
Ver. 2.0
3. The Insulating Hearth
Overview
Your oven sits on a two-layer hearth, comprised of
an insulating layer that rests on top of a 3 1/2" (8 cm)
concrete slab. The FB Board insulation is included
with the oven, is easy to install and very efficient at
holding heat inside your oven.
If gas burner is being
installed, there has to be a hole planned in both
the concrete slab and board insulation for the
burner sleeve.
Instructions
1. Using 2"x 4" (5 x 10 cm) lumber build the frame
for the bottom of the form. The frame should be
roughly 3/8" (9.5 mm) smaller than the width and
depth of your block stand, so that it can be easily
removed after the hearth has cured.
2. Cut (12) lengths of 2"x 4" (5 x 10 cm) that will serve
as the legs that hold the form in place. Use 1/4" (6.8
mm) shims to accurately set the top of the frame.
The top of the 2"x 4" (5 x 10 cm) frame should be
about 3/4" (19 mm)below the top of the stand (to
allow for the 1/2" (12.7 mm) Hardibacker form
bottom and shims).
3.1. The form bottom ready for the Hardibacker.
3. Build the sides of the form using either 2"x 4" (5 x
10 cm) or 2"x 8"(5 x 20 cm) lumber to fit around the
block stand edges. The form sides will need to be
supported by 2"x 4" (5 x 10 cm) legs and shims.
3.2 Form sides held in place with 2"x 4" supports.
4. Cut the sheets of 1/2" (12.7 mm) Hardibacker to fit
inside the wood form and lay on top of the block
stand. Set two 2"x 4" (5 x 10 cm) legs supporting
a 2"x 4" (5 x 10 cm) on its side directly under the
joint, which will support the weight of the wet
hearth while it is curing.
3.3. Hardibacker and form set in place.
5. Build a grid of 1/2" (12.7 mm) rebar slightly shorter
than the external dimension of the wood forms, on
12" (30 cm) centers, starting 6" (15 cm) in from the
edges of the form, set half-way up the 3 1/2" (8 cm)
concrete layer (about 1 3/4" (4 cm)).