New Buck Corporation 85 Alternate Floor Protectors Material, K* Factors Of Alternate Materials

ALTERNATE FLOOR PROTECTORS MATERIAL

Floor protector must be 3/8" minimum thickness non-combustible material or equivalent.

With the floor protector or hearth extension material specified as one layer of 2" thick brick with a K* factor of 5.0, you may use alternate materials as long as the K* factor (s) is calculated as follows:

FORMULA: Required thickness = (K of alternate material/K of millboard) X (thickness of millboard)

EXAMPLE: An alternate inorganic non-combustible millboard with a K* of .9375 would require a thickness as follows:

Required thickness = (.9375/5.0) x 2 in. = 3/8 inch

K* FACTORS OF ALTERNATE MATERIALS

Material	K	Required Thickness
Ceroform 126	.21	1/8"
Limestone	8.0	3.2"
Concrete	8.0	3.2"
Sandstone	13.0	5.2"
Marble	18.0	7.2"

Hearth extension or floor protector thickness above four (4) inches are generally not acceptable due to cost, floor load capacity, and look. The alternate we recommend is using Ceroform No. 126 millboard 1/8" minimum and putting any type decorative brick or stone (any thickness) on top of it.

*The K* factor represents the thermal conductivity of a material and is the time rate of heat flow through a homogeneous material under steady-state conditions, through unit area, per unit temperature gradient in the direction perpendicular to a surface.

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