Figure 4.0
Figure 4.3
Figure 4.1
The adjustable rafter strengthening bracket allows for an adjustment
of pitch in the range of 15 to 30 degrees. The distance the bracket
extends past the fascia is also adjustable to allow for standard
gutters or box gutters with a width of up to 200mm.
In conjunction with rafter strengthening brackets a channel is fixed
to the side of the house rafter (figure 3.0). The bottom end of
the channel will be located at the base of the house rafter. Holes
should be marked and pre-drilled in the channel to suit the location
of existing holes in the bracket. The channel will extend beyond
the bracket so additional holes are to be drilled in the channel at
approximately 500mm centres. Initially the bracket T piece shall be
fixed to the bracket arm with two M12 cup head bolts (hand tighten
only), a spring washer is to be located between the standard M12
washer and nut (figure 4.0). Mark the position of the bracket on the
fascia and notch a rectangular hole in the fascia allowing the bracket
to be fed through the front of the fascia. The hole may need to be
enlarged slightly if the M12 cup head bolts interfere with the fascia.
Insert the bracket through the fascia and fix with the channel to the
house rafter using M12 hex head bolts through the existing holes
in the bracket and further up the channel (Figure 4.3). Adjust the T
piece so it is horizontal and has the appropriate extension past the
fascia to allow for fixing of the attachment beam. T piece connection
bolts are to be tightened to a minimum 50Nm torque.
Fix the bracket as close to the base of the gutter as possible
(recommended distance 10mm from lowest end of gutter), as shown
in figure 4.1.
The attachment beam is to be fixed to the end plate to ensure the
roof sheets drain into the existing house gutter (figure 4.1).
RAFTER STRENGTHENING BRACKETS AND CHANNELS
chann
el exten
sion
web overhang
stud wall
timber rafter
gutter
eaves overhang
brick work
rafter
attachment beam
channel
birds mouth
rafter strengthening bracket
attached to rafter with
6 M12 hex head bolts
attachment beam fixed to
rafter bracket with two M12
bolts
recommended channel extension
beyond birds mouth: 1900mm
recommended web overhang: 400mm
M12 spring
washer
M12 washer
M12 nut
t piece
bracket arm
tighten to 50Nm
torque
M12 cup
head bolt
cooldek roof sheet
rafter
attachment beam
rafter
strengthening
bracket
fix bracket as close as possible
to the base of the gutter
enough clearence for roof
sheets to run into house
guttet
