W415-2007 / A / 10.21.19
EN
10
pre-installation preparation
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
COMMON K and R VALUES CHART
MATERIAL
K-VALUE
R-VALUE
Per inch Per inch
Micore 300
0.43
2.33
Wonderboard (cement board)
1.92
0.52
Common Brick
5.00
0.20
Cement Mortar
5.00
0.20
Ceramic Tile
12.50
0.08
Marble
11.00
0.09
Air Space (ventilated)
0.70
1.43
Sand and Gravel
1.70
0.59
Drywall (gypsum)
1.00
1.00
Rockwool or Fiberglass Batts
0.30
3.33
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.
Содержание Oakdale EPI3-1 Series
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