6
FIREPLACE INSTALLATION
Framing (Cont.)
Hearth Extensions
FIREPLACE INSTALLATION
Continued
Secure fireplace to prepared framing at nailing flanges located at the sides of fireplace as shown in Figure 10.
If a hearth extensions is to be field constructed, it must be made of noncombustible inorganic material having and effective thermal conductivity “K” of 0.84 BTU In/Ft2 Hr.F or least at 1.0 inch thickness.
Thermal conductivity “K” of materials can be obtained from the manufacturer or supplier or the noncombustible material.
The minimum required thickness for any material could be obtained by the following formula:
K factor x 1.0 inch = Thickness required 0.84
If the hearth extension is to be raised, a “Z” type ember protector must be used (see Figure 8, page 5, and Figure 12).
EMBER
PROTECTOR (TYP. OF 2)
*EMBER PROTECTOR STRIPS SUPPLIED
Figure 9 - Ember Protectors
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| MAX |
1/2" | |
(1 | .2cm) |
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1/2" (1.27cm)
Minimum To
Combustibles
Nailing
Flanges
Prepared
Framing
8" | M | IN. |
(20. | ||
| 3cm) |
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52 | 1 |
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NONCOMBUSTIBLE
HEARTH EXTENSION
Figure 11 - Hearth Extension
Noncombustible
Hearth Extension
8" Max.
1 1/2" Typ. “Z” Type Ember Protector
Nails or
Screws
Figure 10 - Nailing Flanges
HEARTH EXTENSIONS
A hearth extension is required to protect the combustible floor surrounding your fireplace. You may obtain kit No.
1 1/2" Typ.
Noncombustible
Hearth Extension
| K Factor | For raised | ||
.84 |
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| fireplace, see | |||
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| framing with a |
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| raised platform. |
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you may fabricate your own per the dimensions shown on Figure 10.
The hearth extension must project a minimum of 16 inches from the front of the fireplace and a minimum of 8 inches beyond each side of the fireplace opening (see Figure 11).
For more
Ember Protector
Figure 12 - Raised Hearth Extension
visit www..com