Appendix A:

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

=

(Hr)(ft2)(f)

Thermal conductivity =

K =

btu

=

(Hr)(ft2)(f)

Thermal resistance =

R =

btu

=

(Hr)(ft2)(f)

For the Jøtul F 3 requires floor protection with a minimum

insulating R-value of 1.1.

Alcove installation require a minimum R-value of 1.1. (If a UL/

ULC or whi listed hearth pad is not used.)

W

(m2)(k)

W

=

(btu)

(m2)(k)

(hr)(ft)(f)

(m2)(k) =

(btu)(inch)

W

(hr)(ft2)(f)

USA/Canada

17

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## Comments to this Manuals

## Latest comments:

Simon EllisAug 24, 2014 01:38: