Masonry Magazine January 1984 Page. 26
FIRECLAY FLUE LINER
NOMINAL 1-in. (25-mm)-AIR SPACE
12 in. (300 mm) MINIMUM
NOMINAL 1-in. (25-mm) AIR SPACE
BAFFLE CHAMBER
CLEAN-OUT DOOR
ROTATING DAMPER
1
BAFFLE CHAMBER
T
FIRE BRICK
BAFFLE CHAMBER
EXTERIOR WYTHE OF MASONRY SHOWN WITH METAL CORROSION-RESISTANT TIES AND ENTRANCE
JOINT REINFORCEMENT
BAFFLE CHAMBER
1
SOLID MASONRY FILL-REINFORCED
CONCRETE SLAB
COMBUSTION CHAMBER
BASE
(Front Section Shown also with Combustion Chamber Arch)
Fig. 4
Modified Conventional Fireplace
dation, care should be taken to account for soil types and foundation conditions. Undisturbed or well-compacted soil will generally be sufficient. However, some types of soils or foundation conditions may require special analysis. This could result in the need for special soil treatments or a unique foundation design.
Building codes generally require that the footing be at least 12 in. (300 mm) thick, and in plan view extend a minimum of 6 in. (150 mm) beyond each face of the masonry heater and chimney assembly. The footing should be positioned so that its base is below the frost line to reduce the possibility of "heaving."
Hearth Support. The brick masonry used to form the hearth support is constructed directly on the foundation system. Even with a thickened slab in a newly constructed slab-on-grade structure, masonry is usually used to construct the base assembly to the height of the hearth support because to properly construct a fountain-style heater, a raised hearth is usually required. The hearth support may be solid masonry carried up from the footing to support the entire hearth area. To conserve materials, the base assembly is usually constructed of masonry which has the same dimensions in plan as the masonry heater and chimney assembly itself.