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For more information, visit www.desatech.com
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Figure 10 - Nailing Flanges
FIREPLACE INSTALLATION
Continued
HEARTH EXTENSIONS
A hearth extension is required to protect the combustible floor
surrounding your fireplace. You may obtain kit No. HE-3612ST or
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).
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).
Figure 11 - Hearth Extension
Figure 12 - Raised Hearth Extension
FIREPLACE INSTALLATION
Framing (Cont.)
Hearth Extensions
1/2" (1.27cm)
Minimum To
Combustibles
Nailing
Flanges
Prepared
Framing
Nails or
Screws
NONCOMBUSTIBLE
HEARTH EXTENSION
52
1
/
2
" M
IN
.
(133.3cm
)
36
1
/
2
" M
IN
.
(92.7cm
)
8" M
IN
.
(20.3cm
)
16" M
IN.
(40.6cm
)
8" Max.
K Factor
.84
1
1
/
2
" Typ.
1
1
/
2
" Typ.
Noncombustible
Hearth Extension
Noncombustible
Hearth Extension
“Z” Type Ember Protector
Ember Protector
For raised
fireplace, see
section on
framing with a
raised platform.
Figure 9 - Ember Protectors
EMBER
PROTECTOR (TYP. OF 2)
*
EMBER PROTECTOR
STRIPS SUPPLIED
1/2" MAX.
(1.2cm)
Secure fireplace to prepared framing at nailing flanges located at the
sides of fireplace as shown in Figure 10.
115603-01A