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TERMINATION
Many building codes specify a minimum chimney heights 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 chimney 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 (Figure 36).
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 (Figure 37).
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 smoking occur.
Figure 36
IF 10
FEET OR
MORE
Figure 37
FOR HEIGHTS
FROM 4' TO 8'
ROOF
Figure 38
24
IF 10
FEET OR
LESS
THEN
THEN
REFERENCE
POINT
SPRB ROOF BRACE
LAG BOLTS
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Additional support is required above the roof if the chimney height
exceeds four (4) feet.
Select the proper support for your application-using either a roof
brace (Figure 38), or a support band with guy wires (Figure 39)
SP ROOF BRACE INSTALLATION
1. Assemble the attachment support band (SPSB) around the chimney,
and clamp it in place at the desired height using the nut and bolt provided.
2. Loosely attach the support legs to the bolts on the attachment band
using hardware provided.
3. Position the support legs as shown in Figure 38. The length of the
support legs can be adjusted by loosening the bolt on the leg clamp.
4. Secure legs to roof using screws provided. Seal screw holes to
prevent roof leaks.
5. Tighten all hardware.
BUT
MUST BE AT
LEAST 2 FEET
10 FEET
BUT
MUST BE AT
LEAST 2 FEET
FOR HEIGHTS
EXCEEDING
8' UP TO 20'
ROOF
Figure 39
NEVER LESS
THAN 3 FEET
L944 FIG21
L944 FIG22
SPSB SUPPORT BAND
(1/4" MINIMUM CABLE
LAG BOLT
NEVER LESS
THAN 3 FEET
GUY WIRES
DIAMETER)
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