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BULLETINS
& ARTICLES
REDPATH SUPER-TWIN
GREENHOUSE (curved rafter):
REVIEW
The Super-Twin Greenhouse is a most advanced twin
skin Greenhouse design. It has been designed for the grower that needs
maximum heat retention while providing high light transmission for their
crop. The Super-Twin design utilises Redpaths cosecant curved rafter truss
design & the raised ridge ventilatilator for improved internal condensation
& environmental control in adverse conditions. The Super-Twin has the
following features:
1. Greater light harvesting through the use of
the curved rafter
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More roof area at right angles to the sun reducing
reflection.
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More roof area to collect light compared to a straight
rafter building, e.g. the Redpath curved rafter gives about a 5% increase
in rafter length over a straight rafter structure.
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Reduced shading of the crop from support structures-
no glazing bars or purlins required to support the roof cladding.
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Greater crop loading capacity (up to 30kg/m2) than
straight rafter greenhouse buildings. This is important with modern high
pole height structures that maximize crop yield per square metre.
2. Greater control of the environment
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Increased air volume above the crop through the use
of the curved rafter.
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Reduced heat loss - structural members are not exposed
to the outside air and through the use of twin skin IR Duratough plastic
film for maximum heat retention.
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Bigger air buffer zone between crop wire and the greenhouse
ridge providing a more stable growing environment.
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Greater growing zone with up to a 4.4m wire height
attainable with a 4.5m pole height.
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More ventilation per square metre.
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Greater safe growing zone using the Redpath curved
rafter for condensation drainage.
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Improved ventilation using the Redpath raised ridge
allowing wider vent opening in rainy conditions and under high condensation
conditions without condensation ‘run back’.
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“V” Gutters with incorporated aluminium condensation
collection traps are standard for improved condensation control. Extra
condensation control can be achieved by fitting an optional drip tray beneath
the “V” gutter.
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Clear span with uncluttered “A” frame that allows
easy installation of IPM or bird screens with minimal restriction to airflow
through the vents.
3. Greater flexibility
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Individual vent or multi-vent control options available.
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Large accessible gutters.
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Designed for 10-12 crop rows.
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Can have single skin roof panel options for conditions
where maximum light harvesting is a priority.
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Shade or thermal screen options available.
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Pack house can be incorporated into the building by
cladding with Steel to provide a secure structural zone (no pre-forming
of the steel required).
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Bumble Bee compatible greenhouse films.
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Cosecant curved rafter - NZ Design
Registration No. 25666, Australian Design Registration No. 123677
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Triple-R raised ridge – Patent Pending
App. No. 337731
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