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* Information as reported by manufacturers and other resources.
** For a 1/8" thickness. You cannot «stack» horizontal still air to accumulate R-values; you must separate each layer of horizontal
still air with another non-combustible material.
6.3.6 MINIMUM HEART EXTENSION REQUIREMENTS
Option Installation type
Directly on the floor
#1
#2
Installation raised less than 8" from floor
Installation on a more than 8"raised base
#3
Installation raised between 8" and 12" from floor
#4
#5
Installation raised 12" or more from floor
For whether installation, the hearth extension floor area must extend at least 8" (203 mm) on each side of
the door opening (C). The joint between the hearth extension and the fireplace hearth needs to be made of
a piece sheet metal (not included).
The floor protection must be a continuous (grouted joints) non-combustible material such as ceramic tile*,
cement board, brick, millboard or equivalent, or any other approved or listed material suited for floor
protection. Note that any type of tile will require a continuous non-combustible sheet beneath to prevent
the possibility of embers falling through to the combustible floor if cracks or separation should occur in the
finished surface. Check local codes for approved alternatives.
DO NOT LEAVE CARPET UNDER THE FLOOR PROTECTION IN FRONT OF THE FIREPLACE.
42
R factor
required
Yes (2.00)
Yes (2.00)
Yes (2.00)
Yes (1.00)
CAUTION
HORIZON – Installation and Operation Manual
A
32"
32"
16"
20"
No
16"
B
C
49"
8"
49"
8"
49"
8"
49"
8"
49"
8"
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