Floor Protection - MHSC SSTB11 Installation, Operation And Maintenance Manual

Woodburning fireplace

Table of Contents

SSTB11 Woodburning Fireplace

If this fireplace is installed on a combustible floor, the floor area 16 inches in front of, and 8 inches either side of the

fireplace opening must be protected by an insulating noncombustible hearth extension. Figure 8

With either type hearth extension minor shifting of the supporting floor or expansion and contraction may eventually

cause a crack to develop between the hearth extension and the face of the fireplace. To help prevent the crack from

developing, the hearth extension materials must be firmly fastened in place. Wall ties should be screwed to the face

of the fireplace and imbedded in the mortar joints of brick, stone, or other non-combustible materials. The metal safety

strip packed with the fireplace must be placed beneath the fireplace and extended under the hearth extension or into

a mortar joint of the hearth extension as shown by Figure 9. In the event a crack does eventually develop, the metal

safety strip will serve as a barrier to prevent sparks or embers from falling from the fireplace onto combustible flooring

materials.

Figure 8

Model H1652

Hearth Extension

Side Brick Outline

Figure 9

NOTE: If noncombustible hearth extension materials are to be

placed at or below the level of the bottom of the fireplace, insu-

lation board is not required.

If the fireplace is recessed into the floor or the hearth is elevat-

ed with combustible materials, an MHSC H1652 hearth exten-

sion kit or equivalent must be used for additional protection.

Min. Air

Space

60"

3/4"

Model H1652

Hearth Extension

16"

Perpendicular

Side Wall

2 " Min.

3/4"

Min. Air Space

Metal Safety

Strip

(2 Required)