Alternate Floor Protection - Quadra-Fire 57ST-ACC Owner's Manual

R
D. Calculating Alternate Floor Protection Material
Thermal Conductivity: k value
The k value indicates the amount of heat (in BTU's) that will flow
in 1 hour throught 1 square foot of a uniform material 1 inch thick
for each degree (F) of temperature difference from one side of
the material to the other. The LOWER the k factor means less
heat is being conducted through the non-combustible material to
the combustible material beneath it. The k value of a material
must be equal or smaller then the required k value to be accept-
able.
(BTU) (inch)
(foot (hour) (
2
Thermal Resistance: R value
The R value is a measure of a material's resisteance to heat
transfer. R value is convenient when more than one material is
used since you can add the R values together, whereas you can
not do this for k value. The HIGHER the R factor means less
heat is being conducted through the non-combustible material to
the combustible material beneath it. The R value of a material
must be equal or larger then the required R value to be accept-
able.
Converting k to R:
Divide 1 by k and multiply the results times th thickness in inches
of the material.
R = 1/k x inches of thickness
Converting R to k:
Divide the inches of thickness by R.
k = inches of thickness/R
Calculatons:
Example: Floor protection requires k value of .84, /4 inch thick.
Alternative material has a k value of .6 and is /4 inch thick.
Divide .6 by .75 = k value of .80. This k value is smaller than .84
and therefore is acceptable.
February 5, 2010
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5700 Step Top Wood Stove Series ACC
7038-159C
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