Vermont Casting CR36R, CR36L Finish Wall, Side Wall Protection, Hearth Installation, 20001316

CR Series Woodburning Fireplaces

Finish Wall

Finish the wall with material of your choice. Do not install a combustible mantel shelf less than 12” (305mm) from the top of the fireplace opening. Do not install a mantel face plate less than 6” (159mm) from top of fireplace opening. (Fig. 18) If a combus- tible material is used below a flat mantel shelf, consult your local building codes for minimum clearance from top of fireplace opening to bottom of mantel shelf.

When finishing the fireplace, a combustible facing ma- terial (i.e. drywall or wood paneling) may be installed at the fireplace surround top as shown in Figure 20. This material may rest on the ledge brackets (brackets on the front and side edges of the fireplace), but must NOT be notched to fit around them. (Fig. 20)

All joints (top, bottom and sides), where the wall or decorative facing material meets the fireplace sur- round must be completely sealed with a noncombus- tible material. (Fig. 17, 18, 20)

Only noncombustible material may be applied as fac- ing to the black fireplace surround.

When finishing the fireplace, never obstruct or modify the air inlet grille in any manner.

When finishing the fireplace, use the material of your choice. If you decide to cover the fireplace surround, noncombustible materials must be used.

Side Wall Protection

All walls constructed closer than 16” (406mm) from the fireplace opening must be protected with CFM Corpo- ration Wall Shield Model SP40 or a built-up wall shield described in Figure 17.

(ANY PERPENDICULAR SIDE WALL MUST NOT BE CLOSER THAN 40” (1016mm) TO THE OPEN END OF AN OPEN END FIREPLACE.)

The built-up wall shield design described in Figure 17 is an alternate method for adding protection to side walls and can be used in place of the SP40 with the same wall clearances specified for the SP40.

EXAMPLES OF INSULATION:

1.Manville - CERAFORM 126, K = .27, 1/2” thick required.

2.CFM Corporation Building Products - EH2416, K =

.458, 1” thick required.

Hearth Installation

A hearth extension is required to protect a combustible floor in front of the fireplace. Refer to Figure 20 for minimum dimensions and mounting detail.

NOTE: Hearth Extension must not cover the air inlet opening of a fireplace.

The hearth extension described in Figure 20 must be a durable non-combustible material with a minimum (to- tal) Rt value of 1.09; refer to Figure 21 for examples.

The overall height (above a combustible floor), depth and width must be as indicated, with the extension centered to the fireplace opening.

The top of the insulation material must be covered with a noncombustible decorative covering or a piece of

.018” minimum sheet metal, to protect hearth exten- sion material. (Fig. 23)

Secure the hearth extension to the floor to prevent shifting, using trim molding or other similar means at three (3) outer edges. Seal crack between the fire- place hearth and hearth extension with a noncombus- tible material. (Figs. 22,23)

WARNING: HEARTH EXTENSION MUST BE INSTALLED IN ACCORDANCE WITH FIGURES 20 AND 21.

Alternate noncombustible materials may be used pro- viding the (total) thermal resistance (Rt value) of the alternate material employed is greater than or equal to R = 1.09. Thermal resistance (R) or thermal conduc- tivity (K), may be obtained from manufacturer of the material. Factors are related by the formula K = 1/R.

T = given thickness

R = thermal resistance for a given thickness (T)

K = thermal conductivity

Noncombustible material with a lower R value may be used, provided thickness of material is sufficiently greater to maintain an equivalent (total) thermal resis- tance (Rt).

Example of Determining Hearth Extension Equivalents

To determine the thickness required for any new mate- rial:

NEW		K of new material (per inch)	thickness
required	=		X of listed
thickness		K of listed material (per inch)	material

Example for Common Brick

T (new) = 5.0/0.458 x .5 in. = 5.46 in. (new required thickness).

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