26
FV42
85-03-01068
R-VALUE TABLES
Backer Materials R-Ratings Table
R-Values of Common Backer Materials
Material
Thickness
R-
Value Application Recommendation
Mineral Fiber Board ( Micore 160)
1/2"
1.27
Recommended
Mineral Fiber Board (Micore 300)
1/2"
1.03
Recommended
Ceramic Board (Rescor 360)
1/2"
1.11
Recommended
Ceramic Board (Fiberfrax Duraboard LD)
1/2"
1.1
Recommended
Skamolex (475, 600, 700, VIP-12, HD)
1”
0.41
Recommended
Promat Promafour
1”
0.41
Recommended for smooth finishes
Common Brick
2 1/4"
0.45
Caution
Common Brick
4"
0.8
Caution
Gypsum or Plaster Board
1/2"
0.45
Caution
Cement Board (Durarock Next Gen)
1/2"
0.39
DO NOT USE
Cement Board (Wonderboard)
1/2"
0.26
DO NOT USE
Cement Board (Hardibacker 500)
1/2"
0.2
Do not use for smooth finishes
Cement Board (Hardibacker)
1/4"
0.13
Do not use for smooth finishes
f i r e - p a r t s . c o m
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