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

9

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! High temperatures, sparks, em-
bers or other burning material falling from the fireplace may
ignite flooring or concealed combustible surfaces.
• Metal hearth strips MUST be installed (Section 7.C.).
• Hearth extensions MUST be installed exactly as
specified.
Table 12.1
R = 1/k x inches of thickness
Table 12.2
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
22
Outdoor Lifestyles by Hearth & Home Technologies Inc. • 4070-300 Rev C • 4/11
•
•
•
•
•
k per inch R per inch
thick thick
0.49 2.06
0.39 2.54
1.92 0.52
5.0 0.20
5.0 0.20
12.50 0.08
0.46 2.18
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 12.1
to convert a k value to an R value,
Refer to Table 12.2 for hearth extension insulation
alternatives.
12 in.
(305 mm)
42 in.
(1067 mm)
66 in.
(1676 mm)
Minimum thickness required
1 in. (25.4 mm)
1 in.(25.4 mm)
4 in. (101.6 mm)
10 in. (254 mm)
10 in. (254 mm)
25-3/4 in. (654 mm)
1 in. (25.4 mm)
29-1/2 to 41 in. (749.3 to 1041.4 mm)
12 in.
(305 mm)
Raised Platform
20 in. (508 mm) Minimum
Flush Hearth
30 in. (762 mm) Minimum