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Retractable "flat roof" greenhouses
are an affordable way to protect rain tolerant crops from
excessive heat, cold, and wind. Flat roof houses have been
used to protect crops from hail and snow, but they have a
limited capacity to withstand the weight of the hail or snow.
There is a wide variety of water porous roof coverings and
structural designs that allow for the optimal balance between
crop requirements, environmental conditions, and the level
of investment.
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Roof Positions |
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| Roof completely retracted |
Roof completely closed |
Roof closed 85% |
| Water Porous
Greenhouse Roof Coverings |
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| Roof coverings are water
porous to allow rain to pass. |
Rain comes through the roof in a grid pattern. |
Some crops are not negatively affected
by the rain. |
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House Designs:
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Standard house widths
24' (7.3m), 30' (9.14m) , 31'-6" |
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(9.6m) |
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Designs available for
one or two separate roof systems |
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One retractable roof |
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One stationary, one retractable |
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Two retractable roofs |
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Roof heights up to 20',
(6.0m) |
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Designs available up
to 120 mph winds (193 kph) |
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Roof coverings:
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clear woven polyethylene |
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white woven polyethylene |
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insect net |
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black shade cloth |
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blackout |
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One retractable roof using clear polyethyelene
roof for protection from winter cold and summer heat. The
clear roof can be left closed during cold days while still
allowing good light transmission., and helps prevent overheating
of soil temperatures on hot sunny days
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One retractable roof using white polypropylene
for winter cold protection and summer shade.
Crops can be protected at night from cold. On hot sunny
days, the white roof provides increased shade and cooling
for low light/ low temperature crops.
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One retractable roof using
black fabric for photoperiod control. |
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| One retractable roof using
black shade cloth for low light crops which do not need protection
from cold. |
Stationary black shade cloth
and retractable greenhouse roof for low light crops that benefit
from extra light and temperature control. |
Retractable greenhouse roof
with retractable black shade for crops that need enhanced control
over light and temperatures. Heat loss at night can be reduced
by closing the black shade cloth. |
| The walls that have motorized roll
up curtains can be automatically: |
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opened: |
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for ventilation when it is raining |
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to expose crops to wind when it is beneficial |
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to improve ventilation when the roof or curtain
system is closed 85% for heat reduction |
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closed: |
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to protect plants from cold/ rain or snow |
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to protect plants from excessive wind |
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to help prevent drift when overhead irrigating or
spraying |
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If crops require protection
from insects, stationary insect net can be installed on
the outside of the roll up curtain openings. |
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| Greenhouse
Roof Coverings |
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| RC98U |
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Clear UV stabilized water porous
woven polyethylene |
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Approximately 20%-25% shade/ 75%-80%
light |
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transmission |
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Is flammable |
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High impact resistance, does not
stretch |
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Usable life is typically 5 to 8 years
when used as a |
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retractable flat roof (roof canopy
is required in |
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locations with high levels of UV)
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| RAR40 |
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White UV Stabilized water porous
woven polypropylene |
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Approximately 30%- 40% shade/ 60%
light transmission |
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Is flammable |
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High impact resistance, does not
stretch |
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Usable life is typically 5 to 8 years
when used as a |
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retractable flat roof (roof canopy is required
in locations
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with high levels of UV) |
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All statements herein are
expressions of opinion which we believe to be accurate and
reliable but are presented without guarantee or responsibility
on our part.
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| Perimeter
Bracing Details |
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Sidewall Cable Bracing
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Sidewall Interior Compression Bracing
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Gable Post Bracing
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| Special
Applications |
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| Life of roof coverings can be extended
by installing a canopy which reduces UV exposure when the roof
is retracted. |
Special vent canopy can help prevent overheating
of crops when the roof is closed 85% during the hot times of
the day. |
Overhead irrigation lines can be supported from
cables. |
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| Heaters can be added to help maintain
warmer temperatures. |
Tracks to support overhead trolleys can be mounted
off the side of the posts. |
Flat roof houses with energy trusses to eliminate
perimeter bracing. |
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| One retractable roof using a structure
with energy trusses to eliminate perimeter bracing and provide
overhead crop/ equipment support |
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