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2700-I ACC Wood Insert

C. 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 through 1 square foot of a uniform mate- rial 1 inch thick for each degree (F) of temperature differ- ence from one side of the material to the other.

The LOWER the k factor means less heat is being con- ducted through the non-combustible material to the com- bustible material beneath it.

The k value of a material must be equal or smaller then the required k value to be acceptable.

(BTU) (inch) (foot2 (hour) (oF)

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, where- as 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 acceptable.

Converting k to R:

Divide 1 by k and multiply the results times the 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 0.84 and 3/4 inch thick.

Alternative material has a k value of 0.6 and is 3/4 inch thick.

Divide 0.6 by .75 = k value of 0.80. This k value is smaller than 0.84 and therefore is acceptable.

December 15, 2009

7046-137C

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Quadra-Fire 7046-137C warranty ACC Wood Insert Calculating Alternate Floor Protection