15
Clearances to Combustibles
Floor Protection
Floor protection under the stove must be a UL 1618 Type I Ember Protector composed of non-
combustible material for protection from radiant heat, sparks, and embers.
Individual sections of floor protection must be mortared together to prevent sparks from falling
through to combustible materials. Any carpeting must be removed from under the floor protection.
The Sedore woodstove must be installed on a non-combustible surface extending: A minimum of
20 1/2” (520.70mm) in front of the stove, (measured from the legs). And 17 1/8 ” (231.90mm
Canada ) on the right, and left side, (measured from the legs), and 8" (171.45mm ) from the back
of the stove (measured from the legs). This will result in a minimum floor protection of 56”W x
52”D (1066.8mm x 1320.8mm) with a Minimum R-value of 1.1.
Floor protectors come with various types of specifications. To convert a floor protector’s specifica-
tion to an R-value, do one of the following:
If the R-value is given, use that value (no conversion needed).
If a K-factor is given with a required thickness (T) in inches, use this formula:
R-value = 1/K x T
If a C-factor is given, use the formula:
R-value = 1/C
To determine the R-value of the proposed alternate floor protector:
Use either the K-factor or the C-factor formula explained above to convert specifications not
expressed as R-values.
For multiple layers of floor protectors, simply add the R-values of each layer to determine
the overall R-value of the layers.
If the overall R-value of your setup is greater than the R-value of the specified R-1 requirement,
then your setup is acceptable.
Non-Combustible Material
Thickness
R-value
Gypsum or plaster board*
0.5”
0.45
Wallboard, Wonderboard, or Durock*
0.5”
0.20
Ceramic board (Fiberfrax or Micor)*
0.5”
1.10
Nominal solid clay brick*
1”
0.20
Ceramic wall or floor tile*
0.25”
0.01
Mineral wool insulation*
1”
3.12
Cement mortar**
1”
0.20
Horizontal still air**
0.125”
0.92
* Check manufacturer’s specifications.
** According to ASHRAE Handbook of Fundamentals 1977
