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SUITABLE FACING BACKER MATERIALS AND HEARTH PROTECTION MATERIALS
It is important to select the proper Facing Backer Material and proper Hearth Protection Material when installing this appli-
ance.
Definitions
Hearth Protection Pad: A non-combustible protective pad installed in front of this fireplace spanning the full width of the
glass door and extending into the room to a depth determined using the supplied chart based on the distance this fire-
place is raised up from the floor needing protection. For Hearth Protection Pads installed in front of this Fireplace, the total
R-values of all layered materials above the combustible floor must have an R-Rating of 1.0 or greater.
Facing Backer Material: The base layer attached to framing studs and extending over the sheet metal face of this fire-
place. Backer Materials placed directly on top of this fireplace's metal face surrounding the glass frame and the convec-
tion air gaps must be of non-combustible quality. It is recommended that you use the highest R-value rated material
available and suitable for your particular type of Finishing Material and the attachment method you select to attach the
Finishing Material to the Facing Backer Material.
R-value is the measurement of the insulating properties of a given material at a given thickness. Below are two tables
showing the R-values of common hearth and facing materials:
Backer Materials R-Ratings Table
R-Values of common Backer Materials
Material Thickness
R-Value
Note
Mineral Fiber Board ( Backer 160)
1/2"
1.270
Mineral Fiber Board (Backer 300)
1/2"
1.030
Ceramic Board (Rescor 360)
1/2"
1.110
Ceramic Board (Fiberfrax Duraboard LD)
1/2"
1.100
Common Brick
2-1/4"
0.450
Common Brick
4"
0.800
Gypsum or Plaster Board
1/2"
0.450
Cement Board (Durock Next Gen)
1/2"
0.390
Cement Board (Wonderboard)
1/2"
0.260
Cement Board (Hardibacker 500)
1/2"
0.200
Cement Board (Hardibacker)
1/4"
0.130
Finishing Materials R-Ratings Table
R-Values of common Facing Materials
Material Thickness
R-Value
Cement Mortar
1/2"
0.100
Concrete 1"
0.095
Ceramic Tile
1/4"
0.020
Flagstone 1"
0.079
Granite 1"
0.083
Limestone 1"
0.153
Marble 1"
0.090
Sandstone 1"
0.079
Slate 1"
0.100
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