WMC Series Woodburning Fireplace
COMMON MATERIALS AND FACTORS
MATERIAL | K* | R | MINIMUM |
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THICKNESS |
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EH2416 | 0.458 | 1.09 | 0.50 in.** |
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(CFM Corporation) |
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Common Brick | 5.0 | 0.10 | 5.46 in.** |
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R Value is for Z\x inch.
*Units of K = BTU/SQ FT/HR/˚F/IN ** Thickness of Listed Material
FP533ADD
Fig. 25 Hearth extension material factors.
Example of Determining Hearth Extension Equivalents
NEW | K of new material (per inch) | thickness |
required | = | X of listed |
thickness | K of listed material (per inch) | material |
To determine the thickness required for any new mate- rial:
Example for Common Brick
T (new) = 5.0 / 0.458 x 0.50 in. = 5.46 in. (new re- quired thickness).
Wall Covering |
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Noncombustible | 2x4" Header - |
Decorative | Do not notch at |
Facing | standoffs. |
Seal all cracks |
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between fireplace |
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surround and wall |
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materials with |
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noncombustible |
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material. |
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Noncombustible |
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Decorative |
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Covering |
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| Seal crack |
Hearth Extension | between fireplace |
Insulation | and hearth extension |
| with noncombustible |
| material. |
Side View |
| Safety Strips - |
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| Must be overlapped |
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| ¹⁄₂" minimum. |
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| FP550 |
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Fig. 26 Sealing gaps. |
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16 | 20000583 |
