60 x 44 x 2.0 G450
Galvanised Channel
Rafter
Strengthening
Bracket
M12 Bolt
Timber Rafter
Figure 2
Figure 3
InTRODUCTIOn
Please read these assembly instructions thoroughly before commencing the construction. Double check all dimensions, levels and bolting
locations before cutting, screwing or bolting structural members. It is recommended that the persons erecting the structure have had some
previous building experience because some modifications to the existing house structure are required.
ATTACHInG TO An EXISTInG STRUCTURE
The builder is to ensure the existing house/structure is of a suitable
structural integrity and complies with all the relevant Australian
Building codes and standards. For more information regarding
the suitability of the house structure to accommodate the Stratco
Attached Clearspan Gable, consult a structural engineer or a building
authority. It is the builder’s responsibility to ensure that the existing
house roof structure is strengthened correctly.
Refer to section 2.1 if attaching Clearspan Gable on its side to a
house, section 2.2 if attaching on its end to a house or refer to both
sections if attaching the gable on its side and end.
Attaching On Side To House
A Stratco Clearspan attached on its side to a house is attached to
the existing eaves overhang at the fascia, or to an existing wall if
height permits.
The first objective in the construction is to fix a structural side beam
along the fascia or wall, to which the Gable Unit is attached.
Most existing houses have not been designed for the attachment of
portal framed gables to their side, therefore additional strengthening
of the house rafters must be performed.
In order to strengthen the existing house rafters, the roof tiles or
roof sheets need to be lifted to expose the roof frame. Steel rafter
brackets and channels are then bolted along the house rafters. Refer
to section 2.1.1.
A 150mm Outback beam is bolted to the strengthening brackets at
the fascia. Once the 150 attachment beam is secured to the house,
the Gable Unit can be erected and fastened to the beam.
Rafter Strengthening
The first step is to determine the number of rafters which need to
be strengthened and their location relative to the unit. You will have
to lift some roof tiles or roof sheets to discover the rafter positions
and spacings. The number of rafters which need to be strengthened
is determined by the builder, however spacing is recommended not
to exceed 1200mm.
Note: It is the builder’s responsibility to ensure the existing
rafters and fascia are adequately reinforced and strengthened to
accommodate any additional attached structure. The reinforcing
method must be approved by the appropriate council or engineer.
It is recommended an adjustable rafter strengthening bracket is used
in conjunction with an extension channel, as shown in (Figure 3).
The adjustable rafter strengthening bracket is shown in (Figure 2).
Please note that this bracket may not be suitable for applications
where the front face of the house gutter is higher than 120 mm. In
these cases please contact Stratco for alternative solutions.
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
(minimum extension) 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). 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.
Adjustable Rafter
Strengthening Bracket
