9Finishing
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
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
•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
•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. | 12 in. | |
(1067 mm) | ||
(305 mm) | ||
| ||
66 in. |
| |
(1676 mm) |
| |
| Raised Platform | |
| 20 in. (508 mm) Minimum | |
| Flush Hearth | |
| 30 in. (762 mm) Minimum |
Hearth Extension Insulation
| k per inch | R per inch |
|
Material | thick | thick | Minimum thickness required |
Hearth & Home HX3, HX4 (Micore 300™) | 0.49 | 2.06 | 1 in. (25.4 mm) |
USG Micore 160™ | 0.39 | 2.54 | 1 in.(25.4 mm) |
USG Durock™ Cement Board | 1.92 | 0.52 | 4 in. (101.6 mm) |
|
|
|
|
Cement Mortar | 5.0 | 0.20 | 10 in. (254 mm) |
Common Brick | 5.0 | 0.20 | 10 in. (254 mm) |
|
|
|
|
Ceramic Tile | 12.50 | 0.08 | |
Armstrong™ Privacy Guard Plus | 0.46 | 2.18 | 1 in. (25.4 mm) |
Marble | 14.3 to 20.0 | 0.07 to 0.05 |
22 | Outdoor Lifestyles by Hearth & Home Technologies Inc. • |