Finishing; Non-Combustible Materials; Combustible Materials; Hearth Extension - Outdoor Lifestyles ODCASTLEWD-42-B Owner's Manual

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Finishing

A. Non-combustible Materials
• Materials which will not ignite and burn, composed of any
combination of the following:
- Steel - Iron
- Brick - Tile
- Concrete - Slate
- Glass - Plasters
• Materials reported as passing ASTM E 136, Standard
Test Method for Behavior of Metals, in a Vertical Tube
Furnace at 750° C
B. Combustible Materials
• Materials made of or surfaced with any of the following
materials:
- Wood - Compressed paper
- Plant fibers - Plastic
• Any material that can ignite and burn; flame proofed or
not, plastered or un-plastered
C. Hearth Extension
WARNING! Risk of fire!
bers or other burning material falling from the fireplace may
ignite flooring or concealed combustible surfaces.
• Metal hearth strips MUST be installed (Section 4.A).
• Hearth extensions MUST be installed exactly as spec-
ified.
Table 9.1
R = 1/k x inches of thickness
Table 9.2
Hearth Extension Insulation Alternatives-Total minimum R Value must equal 2.32
Material
Hearth & Home HX3, HX4 (Micore 300™)
USG Micore 160™
USG Durock™ Cement Board
Cement Mortar
Common Brick
Ceramic Tile
Armstrong™ Privacy Guard Plus
Marble
Outdoor Lifestyles by Hearth & Home Technologies Inc. • ODCASTLEWD-42-B • 4070-160 Rev A • 10/22
High temperatures, sparks, em-
k per inch R per inch
thick
0.49
0.39
1.92
5.0
5.0
12.50
0.46
14.3 to 20.0 0.07 to 0.05
• You MUST use a hearth extension with this fireplace.
• This fireplace has been tested and approved for use with a
hearth extension insulated to a minimum R value of 2.32.
• The hearth extension material MUST be covered with tile,
stone or other non-combustible material.
• Manufactured hearth materials will usually have a
published R value (resistance to heat) or k value
(conductivity of heat). Refer to the formula in Table 9.1 to
convert a k value to an R value,
• Refer to Table 9.2 for hearth extension insulation
alternatives.
12 in.
(305 mm)
66 in.
(1676 mm)
Figure 9.1
thick Minimum thickness required
2.06 1-1/8 in. (28.6 mm)
2.54 1 in.(25.4 mm)
0.52 4-1/2 in. (114.3 mm)
0.20 11-1/2 in. (292.1 mm)
0.20 11-1/2 in. (292.1 mm)
0.08 29 in. (736.6 mm)
2.18 1-1/16 in. (27 mm)
33-1/8 to 46-1/2 in. (841 to 1181 mm)
42 in.
12 in.
(1067 mm)
(305 mm)
Raised Platform
20 in. (508 mm) Minimum
These metal surfaces
may be covered
with non-combustible
material.
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