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ALTERNATE FLOOR PROTECTION
All floor protection materials must be non-combustible ie. metal,
brick, stone, mineral fiber boards). Any combustible material
may not be used.
The easiest means of determining if a proposed alternate floor
material meets requirements listed in this manual is to follow this
procedure.
R-value = thermal resistance
k-value = thermal conductivity
C-value = thermal conductance
1. Convert the specification to R-value;
a. If R-value is given, no conversion is
needed.
b. If k-value is given with a required
thickness (T) in inches: R=1/k X T.
c. If C-value is given: R=1/C.
2. Determine the R-value of the proposed alternate
floor protector.
a. Use the formula in Step 1 to convert
values not expressed as R.
b. For multiple layers, add R-values of each
layer to determine overall R-value.
3. If the overall R-value of the sustem is greater
than the R-value of the specified floor protector,
the alternate is acceptable.
EXAMPLE:
The specified floor protector should be 3/4 thick material with a
k-factor of 0.84. The proposed alternate is 4 brick with a C-
factor of 1.25 over
1/8 mineral board witha k-factor of 0.29.
Step A. Use formula above to convert specifications to R-value.
R=1/k X T= 1/.84 X .75 = .893
Step B. Calculate R of proposed system.
4 brick of C-1.25, therefore
R brick = 1/C = 1/1.25 = 0.80.
1/8 mineral board of k = 0.29 therefore
R mineral board = 1/.29 X 0.125 = 0.431
Total R = R brick + R mineral board=
0.8 + 0.431=1.231
Step C. Compare proposed system R = 1.231 to specified R of
0.893. Since R is greater than required, the system is acceptable.
Definitions:
Thermal conductance =
C =
Btu = W
(hr)(ft
2
)(F) (m
2
)(K)
Thermal conductivity =
k =
Btu = W = (Btu)
(hr)(ft
2
)(F) (m
2
)(K) (hr)(ft)(F)
Thermal resistance =
R =
Btu = (m
2
)(K) = (Btu)(inch)
(hr)(ft
2
)(F) W (hr)(ft
2
)(F)
FOR THE JØTUL OSLO F500 WOOD STOVE REQUIRES
FLOOR PROTECTION WITH A MINIMUM INSULATING R
VALUE OF 0.5.
ALCOVE INSTALLATION REQUIRE A MINIMUM R VALUE
OF 1.6. (IF A UL/ULC or WHI LISTED HEARTH PAD IS NOT
USED.)
APPENDIX A:
19
PARTS LIST FOR THE OSLO F500
1 ash door
2 ash lip
3 front door
4 front
5 right side
6 left side
7 side door
8 rear plate
9 top
10 top cover
11 bottom
12 leg
13 smoke outlet
14 ash house
15 ashpan
16 inner bottom
17 firegrate
18 refractory brick
19 air manifold
20 tube frame holder
21 bottom left tube holder
22 upper left tube holder
23 front tube
23 middle tube
24 rear tube
25 bottom right tube holder
26 upper right tube holder
27 top burn plate
28 insulating blanket (top)
* gasketing for top
* gasketing for top cover
29 side burn plates 2 pcs
* insulating blanket for sides
30 door glass
* glass gasketing
* glass clips
31 inner front
32 primary air lever
33 air valve/slider
34 inspection cover
optional equipment
40 bottom heatshield
41 rear heatshield
42 top exit shield