STR/CVR Series Woodburning Fireplaces

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 0.50 in. = 5.46 in. (new required thickness).

COMMON MATERIALS AND FACTORS

MATERIAL

K*

R

MINIMUM

THICKNESS

EH2416

1.09

0.50 in.**

 

����������������� 0.458

 

 

 

 

 

Common Brick 5.0

0.10

5.46 in.**

 

R Value is for ��� inch.

*Units of K = BTU/SQ FT/HR/˚F/IN ** Thickness of Listed Material

Fig. 25 Hearth extension material factors.

FP533AD

 

2x4"

 

Wall Covering

Stud

 

 

 

Noncombustible

/"

 

Decorative

 

 

Facing

/"

 

 

 

Seal all cracks

Outer Dome

NOTE: /"

 

between fireplace

 

surround and wall

 

air space

materials with

2x4" Header -

between

noncombustible

Outer Dome

material.

Do not notch at

and

 

standoffs.

combustible

Noncombustible

 

materials

Decorative

 

 

Covering

 

 

 

Seal crack

 

Hearth Extension

between fireplace

Insulation

and hearth extension

 

with noncombustible

 

material.

 

Side View

Safety Strips -

 

 

Must be overlapped

 

���" minimum.

 

 

 

FP719

Fig. 26 Finish wall treatments and gap sealing.

Seal Cracks Between Fireplace and Hearth

Extension with Noncombustible Material

Noncombustible

Lower Surround

 

 

Material 7¹⁄₂"

Noncombustible

 

Max. Thickness

Fireplace

Material

 

 

 

 

Combustible

 

Hearth

 

 

 

 

 

 

 

Floor

 

 

 

 

1/4" Min. Thickness

 

 

Majestic Safety

 

 

 

 

 

 

 

 

 

 

Strips Must be

 

Minimum Insulation

 

Overlapped 1/2"

FP1170

Value R-0.94

 

 

Min.

Fig. 27

Hearth extension dimensions.

 

Recessed Installation - STR33/36, CVR36 Only

Noncombustible

 

 

 

 

Material

Minimum

 

 

(if desired)

 

 

36” (914 mm)

A

 

 

 

 

Insulation

 

 

 

 

with Minimum

 

6”

 

 

R Value

 

 

 

 

 

 

(152 mm)

Minimum

of 2.75

 

 

 

 

Minimum

 

 

 

33”

 

 

 

 

 

 

 

 

 

 

(838 mm)

 

 

2”

 

2”

 

 

 

(51 mm)

 

(51 mm)

 

 

Hearth Extension

 

 

 

 

 

A

 

 

 

Minimum .030 Thick Stain-

 

 

 

less Steel Plate

 

 

 

 

 

Insulation with Minimum R

 

 

 

Value of 2.75

 

 

 

 

Minimum .030

 

 

Maximum

 

Thick Stainless

 

 

10”

 

Steel Plate

 

 

(254 mm)

 

 

 

 

Maximum

14” (356 mm)

Hearth

FP1608

Extension

 

View A

NOTE: If noncombustible material is not used between the stainless steel plate and fireplace opening, the steel must be attached to the front of the unit a minimum of four (4) places on each piece with sheet metal screws no longer than 1/2".

NOTE: The size of the insulation and stainless steel plate must be within limits stated above and covers all combustible framing material.

Fig. 28 Recessed installation.

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Majestic STR33, CVR42, STR36, STR42, CVR36 manual Common Materials and Factors