Floor Protection - Osburn 2000-I Owner's Manual

3.2. FLOOR PROTECTION

The floor protection extended beyond the hearth must have an R value greater than 1 (see Figure
3.2 and Table 3.2).
Note 1: From door opening. The depth of a non-combustible shelf in front of the insert is
included in the calculation of the floor protector's dimensions.
Convert specification to R-value:
k-factor is given with a required thickness (T) in inches: R=1/k x T
C-factor is given: R=1/C
Example:
If the floor protector is 4" brick with a C-factor of 1.25 over 1/8" mineral board with a k
factor of 0.29 the total R-value of the system is:
o 4" brick C=1.25, R=1/1.25=0.8
o 1/8" mineral board K=0.29, R=1/0.29 x 0.125=0.431
o Total R = Rbrick + Rmineral = 0.8 + 0.431 = 1.231
Total R is greater than 1.0, the system is acceptable.
CANADA
E 18'' (457 mm) – Note1
I 8'' (203 mm)
J N/A (USA only)
Figure 3.2
FLOOR PROTECTOR
16'' (406 mm) – Note 1
N/A (Canada only)
Table 3.2
7
USA
8'' (203 mm)