Floor Protection for Fireplace Installation

				C
D
		B
E		E	E	E
	F			F
	A			A
	U.S.		Canada
A.	44”	48”	(1219 mm)
B.	46”	50”	(1270 mm)
C.	12”	12”	(305 mm)	8” Connector
	10”	10”	(250 mm)	6” Connector
D.	6”	8”	(203 mm)
E.	6”	8”	(203 mm)
F.	16”	18”	(460 mm)	ST500

Fig. 12 Required ﬂoor protection dimensions.

Procedure:

1.Convert speciﬁcations to R-value:

i.R-value given - no conversion needed.

ii.k-factor is given with a required thickness (T) in inches: R = 1kx T

iii.K-factor is given with a required thickness (T) in

inches: R =	1	x T
	K x 12

iv. r-factor is given with a required thickness (T) in inches: R = r x T

2. Determine the R-value of the proposed alternate ﬂoor protector:

i. Use the formula in Step 1 to convert values not expressed as R.

ii. For multiple layers, add R-values of each layer to determine overall R-value.

3. If the overall R-value of the system is greater than the R-value of the speciﬁed ﬂoor protector, the alter- nate is acceptable.

EXAMPLE: The speciﬁed ﬂoor protector should be 1/2- inch thick material with k-factor of 0.84. The proposed alternate is 4” brick with an r-factor of 0.2 over 1/8” mineral board with a k-factor of 0.29

Step a: Use formula above to convert speciﬁcation to

R-value:R = 1k x T =0.841 x 0.5 = 0.59 Step b: Calculate R of proposed system.

4” brick of r = 0.2, therefore: Rbrick = 0.2 x 4 = 0.8

1/8” mineral board of k = 0.29, therefore 1

Rmineralboard = 0.29 x 0.125 = 0.431

Rtotal = Rbrick + Rmineralboard = 0.8 + 0.431 = 1.231

Defiant 1610 Non-Catalytic Woodburning Stove

Step c: Compare proposed system Rtotal of 1.231 to speciﬁed R of 0.59. Since proposed system Rtotal is greater than required, the system is acceptable.

Deﬁnitions
R =	(ft2)(hr)(°F)		k =	(Btu)(in)		= K x 12

		Btu		(ft2)(hr)(°F)
		Btu		(ft2)(hr)(°F)
K =		(Btu)(ft)	r =	(ft2)(hr)(°F)	=		1
	(ft2)(hr)(°F)			(Btu)(in)			k

Floor Protection for Fireplace Installation

Do not assume that your ﬁreplace hearth is completely noncombustible. Many ﬁreplace hearths do not satisfy the “completely noncombustible” requirement because the brick or concrete in front of the ﬁreplace opening is supported by heavy wood framing. Because heat passes readily through brick or concrete, it can easily pass through to the wood. As a result, such ﬁreplace hearths can be a ﬁre hazard and are considered a com- bustible ﬂoor.

For all ﬁreplace installations, follow the ﬂoor protec- tion guidelines described above, including the need for bottom and ash door heat shields. Keep in mind that many raised hearths will extend less than the required clearance from the front of the heater. In such cases, sufﬁcient ﬂoor protection as described above must be added in front of the hearth to satisfy the minimum ﬂoor protector requirement from the front of the stove: 16” (410 mm) in the United States and 18” (460 mm) in Canada. Hearth rugs do not satisfy the requirement for ﬂoor protection as they are not ﬁre proof.

Fireplace installations also have special clearance requirements to the side walls, side decorative trim and ﬁreplace mantel. Refer to the information on ﬁreplace and mantel trim shields in this section.

Keep the Stove a Safe Distance

From Surrounding Materials

Both a stove and its chimney connector radiate heat in all directions when operating, and nearby combustible materials can overheat dangerously if they are too close to the heat source. A safe installation requires that ad- equate clearance be maintained between the hot stove and its connector and nearby combustibles.

Clearance is the distance between either your stove or chimney connector, and nearby walls, ﬂoors, the ceiling, and any other ﬁxed combustible surface. The Deﬁant has speciﬁc clearance requirements that have been established after careful research and testing. These clearance requirements must be strictly observed.

In addition, keep furnishings and other combustible materials away from the stove. In general, a distance of 48” (1219 mm) must be maintained between the stove and moveable combustible items such as drying

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