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HEARTH PROTECTION PAD REQUIREMENTS
In most installations, a 16" non-combustible protector is required in front of the unit's glass door surface on the floor or
raised hearth. This protection must have a minimum total R-value of 1.0. Different non combustible materials can be
layered to achieve the R-1 value. Refer to the tables below for R-values of common backing and finishing materials.
Mineral Fiber Board ( Backer 160)
Mineral Fiber Board (Backer 300)
Ceramic Board (Rescor 360)
Ceramic Board (Fiberfrax Duraboard LD)
Common Brick
Common Brick
Gypsum or Plaster Board
Cement Board (Durock Next Gen)
Cement Board (Wonderboard)
Cement Board (Hardibacker 500)
Cement Board (Hardibacker)
Backer Materials R-Ratings Table
R-Values of common Backer Materials
Material
Finishing Materials R-Ratings Table
R-Values of common Facing Materials
Material
Cement Mortar
Concrete
Ceramic Tile
Flagstone
Granite
Limestone
Marble
Sandstone
Slate
Thickness R-Value
1/2"
1.270
1/2"
1.030
1/2"
1.110
1/2"
1.100
2-1/4"
0.450
4"
0.800
1/2"
0.450
1/2"
0.390
1/2"
0.260
1/2"
0.200
1/4"
0.130
Thickness
R-Value
1/2"
0.100
1"
0.095
1/4"
0.020
1"
0.079
1"
0.083
1"
0.153
1"
0.090
1"
0.079
1"
0.100
PAGE 12
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