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4-00 13 30491D
BW36 SERIES WOODBURNING FIREPLACE
No one builds a better fire
Major building codes specify a minimum chimney height
above the roof top. These specifications are summarized
in what is known as the “Ten Foot Rule”. This rule states:
If the horizontal distance from the side of the chimney to
the peak of the roof is 10 feet or less, the top of the chim-
ney must be at least 2 feet above the peak of the roof, but
never less than 3 feet in overall height above the highest
point where it passes through the roof. See Figure 9.
If the horizontal distance from the side of the chimney to
the peak of the roof is more than 10 feet, a chimney
height reference point is established on the surface of the
roof a distance of 10 feet from the side of the chimney in a
horizontal plane. The top of the chimney must be at least
2 feet above this reference point, but never less than 3
feet in height above the highest point where it passes
through the roof.
These chimney heights are necessary in the interest of
safety and do not ensure smoke-free operation. Trees,
buildings, adjoining roof lines, adverse wind conditions,
etc., may create a need for a taller chimney should smok-
ing occur.
2. CHIMNEY HEIGHT REQUIREMENTS.
(Above the roof line)
Figure 9
Chimney Height
Height of Chimney Components
Chimney Stabilizer
SL3 4
3
⁄4”
Firestop Spacers
FS338 0
FS339 0
FS340 0
Offset/Returns
SL315 13
3
⁄8”
SL330 14
1
⁄2”
Roof Flashing
RF370 0
RF371 0
Chimney Sections*
SL306 4
3
⁄4”
SL312 10
3
⁄4”
SL318 16
3
⁄4
”
SL324 22
3
⁄4”
SL336 34
3
⁄4”
SL348 46
3
⁄
4”
DETERMINING THE NUMBER OF CHIMNEY
SECTIONS REQUIRED.
To determine the chimney components needed to com-
plete your particular installation, follow the below steps:
1. Determine the total vertical height of the fireplace
installation. This dimension is measured from the
base of the firebox assembly to the point where the
smoke exits the terminal cap.
2. Subtract the height of the firebox assembly (33
5
⁄8")
from the overall height of the fireplace installation.
3. Reference the below chart to determine what compo-
nents must be selected to complete the fireplace
installation.
4. Determine the number of firestop spacers, stabilizers,
roof flashing, etc. required to complete the fireplace
installation.
*Dimensions reflect effective height.
IF 10
FEET OR
LESS
THEN
BUT
MUST BE AT
LEAST 2 FEET
NEVER LESS
THAN 3 FEET
12"
12"
MIN.
TOP OF
FIREPLACE
OPENING
33
5
/8"
Figure 8a - Fireplace (Side View)