53
Hearth Extensions
All MAGNUM 28, 36, 42, and 48 Fireplaces shall have hearth extensions of brick, concrete, stone, tile, or other code
approved non-combustible material. Suitable hearth extension material for the fireplaces shall be placed on the hearth
extension’s non-combustible substrate and must extend to at least twenty inches (20”) in front of the fireplace’s finished
opening and must extend to at least twelve inches (12”) beyond the sides of the finished fireplace opening
(Figure 68)
.
WARNING:
The non-combustible hearth extension, by code, must sit on non-combustible substrate, which shall have
no wood underpinnings. This means that off-grade wood floor systems shall be constructed in such a way that all wood
floor joists and sub-flooring shall stop twenty inches (20”) out from the front of the firebox
(Figure 69)
.
Mantle and Mantle Shelf Clearances
Fireplaces are subject to the same building code safety clearances to combustible trim as with any radiant heat fireplace.
All combustible trim shall be kept at least eight inches (8”) from the finished fireplace opening.
Combustible trim located along the sides of the fireplace opening, which project more than one and a half inches
(1½”) from the face of the fireplace, shall have additional clearance from the eight inches (8”) equal to the projection.
Combustible projecting mantles – up to twelve inches (12”) of projection – shall not be placed less than fourteen
inches (14”) from the top of the fireplace opening. Combustible mantles, which project more than twelve inches (12”)
from the face of the fireplace, shall have additional clearance from the fourteen inches (14”) equal to the projection.
NOTE:
The local authority having jurisdiction may require greater clearances for projecting combustible mantle shelves.
Be sure to check local building codes regarding required clearances to projecting combustible mantles.
Adjoining Walls:
Side walls and walls to rooms adjoining fireplace installations cannot be closer than twenty-six
inches (26”) to the finished fireplace opening.
NOTE:
“Clearance to Combustible Trim” are those distances required to ensure that a fireplace mantle or facing will not
catch fire. In most cases, the distances should also be adequate to prevent any discoloration or warping due to heat.
However each installation presents a unique and completely different set of circumstances involving many variables.
These include paint or finish composition, previous exposure to heat, methods and quality of construction, air flow
patterns, etc. Because of these variables, the manufacturer does not guarantee that heat warping or discoloration will
never occur.
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Clearance to Combustible Trim - 28, 36, 42 & 48 Models
FIGURE 68
FIGURE 69
14
”
4"
8"
20"
Earthcore Industries
MAGNUM Series Fireplace
14
”
4"
8"
20"
