Installation

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
16
ROOF BRACE (RB)
1. The roof brace is used to stabilize the chimney where it extends more
than 15’ above the roof.
2. It consists of one band (RB) and two braces (supplied by the installer).
3. To minimize loads induced by thermal expansion on braces and sup-
port, the maximum distance between the last fixed support and the
band of the roof brace must be reduced to 5’.
4. Begin by attaching the braces to the band with supplied bolts and
nuts. Next, install the band on the chimney and tighten the band. Fix
the braces to the roof at 120°. Make sure you have a rigid structure
on the roof.
Figure 34 - Roof brace assembly
GUY WIRE (GW)
1. The guy wire is used where the chimney extends more than 15’ above
the roof.
2. It consists of a band designed to receive 3 guy wire (supplied by others)
at 120° apart or 6 guy wire at 60° apart for diameter larger than 24”.
The guy wires are fixed to the roof by mean of tensioner and anchor
(also by others).
3. When installing guy wire, the cable must be slightly slack or loose to
allow thermal expansion or be equipped with tensioning springs (by
others). The tensioning springs are mandatory only when there is
more than one level of guy wire needed.
4. To minimize the effect of thermal expansion, good practice implies
installing a fixed support and an expansion length at the roof level
(see Figure 35 ’guy wire’).
Figure 35 - Guy Wire
1-1/4” Rigid galvalume tube
or 1-1/2” x 3/16” angle iron
(by others)
Fixed support
5’ Max
H
120°
Guy Cable * tensioners and
roof anchors * (by others)
Guy wire band (GW)
Fixed support
H
Expansion length
* Cables and roof anchors
designed for 30 lb. per
sq. ft. force on chimney
projected area.