5100-I ACT WOOD INSERT
April 21, 2010
R
438-0380E
F. Hearth Extension
the portion of the insert extending onto the hearth must be
can be ordered from your dealer. Refer to page 23.
Material
k per
inch
thick
R per
inch
thick
Minimum
thickness
required
0.49 2.06
0.49 2.06
1.92 0.52
Cement Mortar 5.0 0.20
5.0 0.20
12.50 0.08
Marble
14.3 to
20.0
0.07 to
0.05
Hearth Extension Insulation Alternatives, R Value = 1.03