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
