Mendota ML60 - Page 28

85-03-01147 ML60 Page 28
Prior to use of any marble, granite or polished stone facing material, especially white colored ones, run heat exposure tests on a
sample piece. Expose sample pieces to temperatures between 275
o
F and 350
o
F for a period of eight hours. Compare the heat
exposed sample to a control unheated piece and judge for color changes. Do not use if any color changes are evident.
Mendota recommends the use of honed bare marble and bare stone facing materials or honed bare granite
and epoxy resin coated granite only.
Mendota cautions that due to natural structural defects that can exist within marble and stone pieces, cracking and/or flaking
of the marble or stone is possible and must be considered prior to selection and application around Mendota Fireplaces.
Mendota further cautions that proper adhesives be used to attach stone facings. Pay attention to the potential of off-gassing of
chemical vapors from mastic and other adhesives. Improper selection can lead to emission of chemicals with unwanted smells.
Suitable Backer Materials R-Ratings
R-Values of common Backer Materials
Material
Thickness
R-Value
Mineral Fiber Board ( Micore 160)
1/2"
1.270
Mineral Fiber Board (Micore 300)
1/2"
1.030
Mineral Fiber Board (Micor SB)
1/2"
1.470
Cearmic Board (Rescor 360)
1/2"
1.110
Cearmic Board (Fiberfrax Duraboard LD)
1/2"
1.100
Skamolex (475, 600, 700, VIP-12, HD)
1”
0.410
Promat Promafour
1”
0.410
Gypsum or Plaster Board
1/2"
0.450
Cement Board (Hardibacker 500)
1/2"
0.200
Cement Board (Hardibacker)
1/4"
0.130
Common Brick
2-1/4"
0.450
Common Brick
4"
0.800
Suitable Finishing Materials R-Ratings
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