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Suitable Mantel, Facing & Hearth Pad Materials
Materials used in areas designated as non-combustible must be rated as non-combustible per NFPA 220 Standard on Types of
Building Construction, or reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube
Furnace at 750 Degrees C.
WARNING: Common Finishing Materials Not Approved for use.
Paper faced gypsum board (drywall) including Type X Fire Rated board is not a non-combustible material. These boards are
not approved for use in the non-combustible zone of the fireplace.
WonderBoard brand boards are commonly used as a backerboard for tile. WonderBoard backerboard is not a non-
combustible material and is not approved for use in the non-combustible zone of the fireplace. In addition, WonderBoard
off-gasses when heated and should not be used anywhere near the fireplace.
Mendota does not guarantee any materials used around the fireplace. Mendota disclaims any and all liability for any damage to
finishing materials including warping, discoloring, cracking, peeling or flaking. This also includes any off-gassing or unpleasant
smells from materials when they are heated.
R-Values of Common Finishing Materials
Material
Mineral Fiber Board (Micore 160, 300, SB)
Cearmic Board (Rescor 360)
Cearmic Board (Fiberfrax Duraboard LD)
Material
SkamoEnclosure Board
Promat Promafour
Cement Board (Hardibacker 500)
Cement Board (Hardibacker)
Common Brick
Common Brick
Thinset Mortar
Concrete (150 lbs/Cubic Foot)
Ceramic Tile
Flagstone
Granite
Limestone
Marble
Sandstone
Slate
85-03-01113
R-Values of Hearth Pad Boards
Thickness
1/2"
1.2 – 1.4
1/2"
1/2"
R-Values of Common Finishing Materials
Thickness
R-Value
1"
0.410
1"
0.410
1/2"
0.200
1/4"
0.130
2-1/4"
0.450
4"
0.800
1/4"
0.100
1"
0.07
1/4"
0.25
1"
0.079
1"
0.05
1"
0.08
1"
0.08
1"
0.079
1"
0.100
DXV35DT4
R-Value
Only approved for use as an insulator
under other non-combustible finishing
material for a hearth pad.
1.11
Do not use on the face of a fireplace or
1.10
wall.
Application
Best option for a smooth wall finish. Least chance
of cracking from heat.
Best used as a backer board for tile or natural
stone installations.
Not recommended as a smooth wall finish unless
used with a Cool Wall heat transfer system.
Common non-combustible materials used around
a fireplace. Can be used on the wall or hearth
pad. Install these materials per the
recommendations in the following sections.
Application
Page 26
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