Ultraspan cosecant curved rafter naturally improves
condensation runn off and light transmission.
Redpath's exclusive use of our registered design
curved rafter "A" frame portal for the Ultraspan design offers growers
a superior edge for their greenhouse crop production. A curved rafter
truss or “cosecant rafter” design is extremely well suited for use as a
greenhouse roof truss. It offers superior environmental control performance
& gives fundamental cropping advantages to lift production for the
grower when compared to any other overhead truss design.
A curved rafter portal with its variable pitch
will naturally drain internal condensation speedily to the edge of the
roof line & thus prevent condensation water from dripping onto the
crop whilst also significantly increasing light transmission to the crop.
There is a 50% decrease in Driplines.
A curved rafter concept also offers up to 30% reduction
in shading from solid overhead frame members, whilst at the same
time crop support load strength is boosted by over 10% compared to
a traditional straight rafter web truss design.
This dramatic improvement in condensation control
reduces substantially the incidence & spread of crop diseases.
Whilst the overall light transmission gains lifts crop production throughout
the year there is a particular high gain during duller winter months.
The Redpath aluminium gutter lockstrip is fastened
along the side faces of all internal gutters & is positioned to catch
the run off of condensation from the roof sheets & direct it outside
of the greenhouse. By stopping the recycling process within the structure
of it's own condensation a large gain in humidity control is achieved.
