5100-I ACT WOOD INSERT
Page 10
April 21, 2010
R
438-0380E
F. Hearth Extension
If the hearth extension is lower than the fireplace opening,
the portion of the insert extending onto the hearth must be
supported. Manufacturer designed adjustable support kit
can be ordered from your dealer.
Refer to page 23.
Material
k per
inch
thick
R per
inch
thick
Minimum
thickness
required
Hearth & Home HX & HX
0.49
2.06
1/ in.
USG Micore 00™
0.49
2.06
1/ in.
USG Durock™ Cement Board
1.92
0.52
-1/ in.
Cement Mortar
5.0
0.20
5-7/8 in.
Common Brick
5.0
0.20
5-7/8 in.
Ceramic Tile
12.50
0.08
1-5/8 in.
Marble
14.3 to
20.0
0.07 to
0.05
16-5/8 in. to
-/8 in.
Hearth Extension Insulation Alternatives, R Value = 1.03
