18" (457 mm)
8" (203 mm)
Top View

PLANNING YOUR INSTALLATION – Model CI1000HT

FLOOR PROTECTION

FOR INSTALLATIONS IN CANADA

MODEL CI1000HT

The floor protector must meet or exceed the minimum thermal requirements as defined on this page (see Floor Protection 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 chimney connector extends horizontally over the floor, protection

must also cover the floor under connector and at least 2" (51 mm) to either side.

The floor protector must

 

 

fully cover

the area

8"

8"

beneath the

appliance

(203 mm)

(203 mm)

and extend 18” to the front, 8” to the sides, and 8” from the back as shown in the illustration to the right.

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 1.45”. With these values, 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 1.45" (37 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: DurockCement 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

Minimum

of the alternate

material (per inch)

x thickness

material

 

k value of listed

of listed

 

 

material (per inch)

material

TM (inches) = 1.92 x .1.45”

.84

Answer using k: ~2.287 x ~1.45” = ~ 3.316” = ~ 3 5/16”

~3 5/16” thickness Durock Cement Board will be required.

Using the r formula:

TM (inches) = 1.19 x TL rM

TM (inches) = 1.19 x .1.45”

.52

Answer using r: ~2.287 x 1.45” = ~3.316 =~ 3 5/16”

~3 5/16” 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 equal to or greater than:“R” = r x TL = 1.19 x 1.45” = ~ 1.73.

Listed Material

Listed Material

Thermal Values

Listed Min.

 

 

 

Thickness

 

k (per inch)

r (per inch)

TL

Listed Material →

.84

1.19

1.45”

 

 

 

 

Approved Alternate Materials for

Floor/Hearth Protection (**)

Alternative

Thermal Values

* Minimum

Materials ↓

 

 

Thickness

 

k(perinch)

r (per inch)

 

TM

Kaowool M Board

.47

2.13

* 1.45”

Micore 160

.35

2.86

* 1.45”

Micore 300

.46

2.18

* 1.45”

DurockCement Board

1.92

.52

3.5/16”

Hardibacker

1.95

.51

3

3/8”

Hardibacker 500

2.30

.44

 

4”

Cultered Stone

2.82

.35

4

7/8”

Hearthstone

 

 

 

 

Wonderboard

3.23

0.31

5 9/16”

Face brick

9.00

0.11

15

9/16”

Common brick

5.00

0.20

8

5/8”

Cement mortar

5.00

0.20

8

5/8”

Ceramic tile

12.5

.08

21

9/16”

Marble

~20.0

~.05

34

9/16”

Note: To convert inches to millimeters divide by .03937.

(*)After minimum thickness is calculated, the thickness can be no less than 1.45” (36.8mm).

(**)If the floor protector to be used is a noncombustible mate- rial and is NOT listed on this chart on this chart, the manufac- turer of the material must provide either the listed k-value per inch or r-value per inch and the minimum thickness will need to be calculated per instructions on this page.

TM (inches) =

k

M

 

x TL

 

.84

 

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