PLANNING YOUR INSTALLATION – Model CI1000HT
FLOOR PROTECTION
FOR INSTALLATIONS IN THE USA
MODEL CI1000HT
The floor protector must meet or exceed the minimum thermal requirements as defined on this page (see Floor Protec-
tion Using Alternate Material As Floor Protector). If the floor
protection is to be stone, tile, brick, etc., it must be mortared or grouted to form a continuous noncombustible surface. If a
TM (inches) = 1.92 x 1/2”
.84
Answer using k: 2.286 x 0.50” = 1.143 = ~ 1 9/64”
1 9/64” thickness Durock Cement Board will be required.
Using the r formula:
TM (inches) = 1.19 x TL rM
chimney connector extends horizontally over the floor, protection must also 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 18” to the front, 5.2” to the sides, and 0” from the back as shown in the illustration to the right.
| Top View | |
| 0 " |
|
| (0 mm) | |
5.2" | 5.2" | |
(132 mm) |
| (132 mm) |
|
| |
| 18" (457 mm) |
|
|
|
|
TM (inches) = 1.19 x .5”
.52
Answer using r: 2.288 x 0.50” = 1.143 = ~ 1 9/64”
1 9/64” thickness Durock Cement Board 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: “R value” = 1/k = r x thickness of material used. Given that the required “R value” for a suitable floor protector used must be
FLOOR PROTECTION
USING ALTERNATE MATERIAL AS FLOOR PROTECTOR
The hearth pad or alternate material used as a floor 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 1/2”. With these val- ues, determine the minimum thickness of the alternate material required using the formula(s) and the table shown here (see chart – Approved Alternative Materials for Floor Protection).
Note: Any noncombustible material having a thickness of 1/2” (13 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 Board is to be used for the floor protection. 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:
Desired Thickness | k value of desire | Minimu | ||
of the alternate | = | material (per inch) | x thickness | |
material |
| k value of listed | of listed | |
|
|
| material (per inch) | material |
TM (inches) = | kM | x TL |
| |
|
| .84 |
|
|
equal to or greater than:“R” = r x TL = 1.19 x .5” = .60.
Listed Material
Listed Material | Thermal Values | Listed Min. | |
|
|
| Thickness |
| k (per inch) | r (per inch) | TL |
Listed Material → | .84 | 1.19 | 1/2” |
|
|
|
|
Approved Alternate Materials for Floor Protection (**)
Alternative | Thermal Values | * Minimum | |
Materials ↓ |
|
| Thickness |
| k(perinch) | r (per inch) | TM |
Kaowool M Board | .47 | 2.13 | * 1/2” |
Micore 160 | .35 | 2.86 | * 1/2” |
Micore 300 | .46 | 2.18 | * 1/2” |
Durock Cement Board | 1.92 | .52 | 1 3/16” |
Hardibacker | 1.95 | .51 | 1 3/16” |
Hardibacker 500 | 2.30 | .44 | 1 3/8” |
Cultered Stone | 2.82 | .35 | 1 11/16” |
Hearthstone |
|
|
|
Wonderboard | 3.23 | 0.31 | 1 15/16” |
Face brick | 9.00 | 0.11 | 5 3/8” |
Common brick | 5.00 | 0.20 | 3” |
Cement mortar | 5.00 | 0.20 | 3” |
Ceramic tile | 12.5 | .08 | 7 ½” |
Marble | ~20.0 | ~.05 | 11 15/16” |
Note: To convert inches to millimeters divide by .03937.
(*)After minimum thickness is calculated, the thickness can be no less than 1/2” (13mm).
(**)If the floor protector to be used is a noncombustible ma- terial and is NOT listed on this chart on this page, the manu- facturer of the material must provide either the listed
PAGE 5