16
Front of Fireplace
(Surface of Cement Board)
Min. Hearth Projection
Required to Protect
Combustible Floor
Surface of
Combustible
Floor or Carpet
Bottom of
fireplace
When using Optional Trims and
Mantels, Surface of Finished
Hearth Must Be Flush With
Bottom of Fireplace
(otherwise, optional trims will not fit)
Surface of Hearth
(non-combutible material on
non-combustible insulation board
see diagram below)
Wood is Allowed
Directly Below Fireplace
Raised 1”
above combustible floor
Raised 2”
above combustible floor
Raised 3”
above combustible floor
Raised 4”
above combustible floor
3”
6”
9”
12”
4”
3”
2”
1”
Surface of
Combustible
Floor or Carpet
Bottom of
fireplace
Wood is Allowed directly below fireplace
Note: Any shims used underneath to raise the
heater should be set back 1/2” behind front face of
framing otherwise topface of shims may be visible
Surface of
Combustible
Floor or Carpet
Bottom of
fireplace
ood is Allowed directly below fireplace
ny shims used underneath to raise the
d b
t b
k 1/2” b hi d f
t f
f
Non-Combustible
Finish
1/2” Insulation
Board supplied
with fireplace
Note: This surface can get
very hot if flush with bottom
of heater. We recommend
raising the heater.
DO NOT FINISH ABOVE
THIS HEIGHT!
(Hearth MUST be at this height
when using certain accessories
and trims - see pages )
See Chart above for Required Projection
Non-combustible substrate
construction detail
Example: If the
fi
replace is raised 2” above
combustible
fl
oor, the non-combustible-
fl
ush-
with-bottom-of-
fi
replace hearth must project a
min. of 6” in front of the
fi
replace.
Hearth projection
Height of f
ire
pl
ace
ab
ove combu
stib
le f
lo
or
Unit With Site-Built Non-Combustible Hearth Extending
19–25
Planning
Framing
Hearth
