Hearth Extension / Fl Oor Protection - Napoleon Oakdale EPI3-1 Série Manuel D'installation Et D'opération

pre-installation preparation
EN
2.2 hearth extension / fl oor protection
Hearth extensions / fl oor protection must be made of non-combustible materials. They must meet the following
specifi cations:
• Minimum extension to the front of the insert:
- Canada: 18" (45.7cm)
- USA: 16" (40.6cm)
• Minimum 8" (203mm) extension to the sides of the insert
• Minimum 0.5" (13mm) thickness
• Minimum (K*) 0.84 thermal conductivity factor; and
• Minimum (R*) 0.59 resistance value
* See chart below for more information.
CONVERTING MATERIAL SPECIFICATIONS TO R OR K VALUES
R = Thickness / K-Value
K = Thickness / R-Value
MATERIAL
Micore 300
Wonderboard (cement board)
Common Brick
Cement Mortar
Ceramic Tile
Marble
Air Space (ventilated)
Sand and Gravel
Drywall (gypsum)
Rockwool or Fiberglass Batts
With K values, the lower value is a better insulator. With R values, the higher number is better.
K-Value Example:
A wood stove may call for thermal protection which has a K factor of 1 or less. A product
such as Micore 300 Board from USG has a K-Value of approximately .43 per inch.
Therefore, a 1/2" (12.7mm) thickness of this board would have a K-Value of .86, which
meets the requirement of our example stove.
R-Value Example:
This appliance calls for thermal protection with an R-Value of 0.59. This same board above
is rated as having an R-Value of 2.33 for a 1" (25.4mm) thickness. Therefore, 1/2" (12.7mm)
of the Micore 300 Board would have a R-value of 1.165, which meets the specifi cations for
this appliance.
10
W415-2007 / A / 10.21.19
COMMON K and R VALUES CHART
K-VALUE R-VALUE
Per inch Per inch
0.43 2.33
1.92 0.52
5.00 0.20
5.00 0.20
12.50 0.08
11.00 0.09
0.70 1.43
1.70 0.59
1.00 1.00
0.30 3.33