PLANNING YOUR INSTALLATION
FLOOR PROTECTION – Advantage II-T C FS
(For USA and Can- ada) This appliance requires 3/8" (10 mm) minimum non- combustible floor protection designed for solid fuel burning appliances having a thermal conductivity of k = .84 BTU in/ft or equivalent. If the floor protection is to be stone, tile, brick, etc., it must be mor- tared or grouted to form a continuous
face (See Using Alternate Material As Floor Protector below). If a chimney connector extends horizontally over the floor, protection must cover the floor under the connector and at least 2" (51 mm) to either side. The floor protector must fully cover the area beneath the appliance and extend 6” to the front, 6” to the sides, and up to 6” from the back (see illustra- tion above and following note).
*Note: When installed at clearances less than 6”, the floor protection is only required to extend to the wall.
FLOOR PROTECTION / HEARTH EXTENSION USING AL- TERNATE MATERIAL AS FLOOR PROTECTOR (also see Floor Protection above for freestanding models and Hearth Requirements, page 8 for the insert model)
The hearth pad or alternate material used as a floor/hearth protector must be constructed of a durable noncombustible material having an equal or better thermal conductivity value (lower k value) of k = .84 BTU / IN FT2 HR °F or a thermal resistance that equals or exceeds r = 1.19 HR °F FT2 IN/BTU with a minimum thickness of 3/8”. With these values, determine the minimum thickness of the alternate material required using the formula(s) and the table shown here (see chart - Approved Alternate Materials for Floor/Hearth Protection).
Note: Any noncombustible material having a minimum thickness of 3/8” (10 mm) whose k value is less than .84 or whose r value is more than 1.19 is acceptable. If the alternate material used has a higher k value or lower r value will require a greater thickness of the material used. In some cases, if the k value is less or the r value higher, a thinner material may be used.
Methods of determining floor protection equivalents:
To determine the thickness required for the alternate material when either the k value or r value is known, use either the k formula or r formula:
Example: Durock Cement is to be used for the floor protec- tion. How thick must this material be? The following formulas give the means of determining minimum thickness required.
TM = minimum thickness required for alternate material kM = k value per inch of alternate material
TL = minimum thickness of listed material rM = r value per inch of alternate material
Using the k formula:
Minimum |
|
| Specified min. | |
thickness of | = | of alternate material | x | thickness |
alternate |
|
| of listed | |
material |
| of listed material |
| material |
TM (inches) = kM x TL
.84
TM (inches) = 1.92 x .375 (3/8”)
.84
Answer using k: 2.29 x 0.375” = 0.858 = ~7/8”
7/8” thickness (minimum) Durock Cement will be required. Using the r formula:
TM (inches) = 1.19 x TL rM
TM (inches) = 1.19 x 375 (3/8”)
.52
Answer using r: 2.29 x 0. 375” = 0.858 = ~7/8”
7/8” thickness (minimum) Durock Cement will be required.
At times it is important to know what combination of materials are acceptable for use as floor protection. The “R values” are used to determine acceptable combinations of materials because “R val- ues” are additive where r and k values are not.
“R value” = 1 = r x thickness of material used k
Example: Given that the required “R value” for a suitable floor pro- tector used must be equal to or greater than “R” = r x TL = 1.19 x
.375” = .45.
Listed Material
| Thermal Values | Specified | |
|
|
| Minimum |
|
|
| Thickness |
| k (per inch) | r (per inch) | TL |
Listed Material → | .84 | 1.19 | 3/8” (.375) |
Approved Alternate Materials for
Floor/Hearth Protection (**)
Alternative | Thermal Values | * Minimum | ||
Materials ↓ |
|
| Thickness | |
| k (per inch) | r (per inch) |
| TM |
Kaowool M Board | .47 | 2.13 | * 3/8” | |
Micore 160 | .35 | 2.86 | * 3/8” | |
Micore 300 | .46 | 2.18 | * 3/8” | |
Durock Cement | 1.92 | .52 | 7/8” | |
Hardibacker | 1.95 | .51 | 7/8” | |
Hardibacker 500 | 2.30 | .44 | 1 | 1/8” |
Cultered Stone | 2.82 | .35 | 1 | 5/8” |
Hearthstone |
|
|
|
|
Wonderboard | 3.23 | 0.31 | 1 | 1/2” |
Face brick | 9.00 | 0.11 | 4 | 1/8” |
Common brick | 5.00 | 0.20 | 2 | 1/4” |
Cement mortar | 5.00 | 0.20 | 2 | 1/4” |
Ceramic tile | 12.5 | .08 | 5 5/8” | |
Marble | ~20.0 | ~.05 |
| 9” |
|
|
|
Note: To convert inches to millimeters divide by .03937.
*After minimum thickness is calculated, the thickness can be no less than 3/8” (.375” / 10mm).
(**)If the floor protector to be used is a noncombustible material and is NOT listed on the chart above, the manufacturer of the material must provide either the listed
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