WoodPro WS-TS-1500, Owner'S Manual

This stove has been tested for and must be installed on a 

floor

 protector with the proper Thermal Resistance or R-value 

as stated in step 1 of the installation instructions under “Locating Stove” section of this manual. If the 

floor

 protector ma-

terials listed in the instructions are not available, materials with an equivalent R-value may be substituted. 

Alternate materials may be rated with C-factor (Thermal Conductance) or k-factor (Thermal Conductivity) ratings 

which must be converted to R-value to determine if the alternate material meets the tested requirements. The following 
instructions provide the proper information and formulas for conversion to R-value.

To determine if alternate materials are acceptable follow this sequence.
1.  Conv

ert material specifications to R-

value:

a. R-value given — no conversion necessary

b. K-factor is given with a required thickness (T) in inches:

R = 1/k x T

c. C-factor is given: R = 1/C

2.  Determine the R-v

alue of proposed alternate floor prot

ector:

a. Use formulas in step 1 above to calculate R-value of proposed material(s). 
b. For multiple layers, add R-values of each layer to determine overall R-value.

3.  If the overall R-value of the 

floor

 protector system is equal to or greater than the 

floor

 protector 

specifications

 given, 

the alternate is acceptable.

Definitions:

Thermal conductance(C) =  

BTU 

=

W

(hr)(ft

2

)(°F) 

(m

2

)(°K)

Thermal conductivity (k) = 

(Btu)(inch) 

=

W 

=

Btu 

(hr)(ft

2

)(°F) 

(m)(°K) 

(hr)(ft)(°F) 

Thermal resistance (R) = 

(ft

2

)(hr)(°F) 

=

(m

2

)(°K) 

Btu 

W

Example:

The specs of floor protector material should be 3/4-inch thi

ck material with a k-f

actor of 0.84.

The proposed alternativ

e material is 4” brick with a C-

factor of 1.25 over 1/8-inch mineral board 

with a k-factor of 0.29.
Step 1:  Convert specs to R-value. 
 

R = 1/k x 

T = 1/0.84 x 0.75 = 0.893   System must h

ave a R-value of 0.893 = Rspecs

Step 2: Calculate R-value of individual components
 

4” Brick with C-

factor = 1.25.  R = 1/C = 1/1.25 = 0.80 = Rbrick

1/8-inch (0.125”) mineral board with k-factor = 0.2

9. R = 1/0.29 x 0.125 = 0.431 = Rmin.brd.

Step 3: Add R-values of components to get total R-value of system
 

Rmin.brd = 0.80 + 0.431 = 1.231 = Rsy

stem

Step 4: Compare Rsystem to Rspecs

Rsystem  =  1.231  is  larger  than  Rspecs  of  0.893.  System  R-value  exceeds    the  required  

specifications and therefore is an acceptable alter

native.

FLOOR PROTECTOR MATERIAL CALCULATIONS

32