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The retractable A frame greenhouse comes in two basic models; the conventional A frame and the low
cost A frame Rafter greenhouse. The conventional A-Frame truss is designed for heavy snow and wind
loads and has spans that match up with most standard house widths. The lower cost A-Frame Rafter
house is designed for covering large areas in the sunbelt where crops need to be protected from cold,
wind, heat and rain, but there is less snow than in colder climates.
| Conventional A-Frame Greenhouse
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A-Frame Rafter Greenhouse
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- 5/12 roof pitch
- Truss designs for up to 70lb/ sq ft snowload and 140MPH (225KPH) windload
- House widths of 24ft, 30ft, 31-6ft, 36ft,41-6ft
- 10ft (3.2m)- 20ft ( 6m) gutter height
- 12ft (3.65m) truss spacing
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- 3/12 roof pitch
- Truss designs for up to 15lb/ sq ft (73kg/sq m) snowload and 110MPH (177 KPH) windload
- 48ft ( 14.63m) between gutters
- 13 ft (4m) gutter height
- 12ft (3.65m) truss spacing
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A-Frame
retractable roof greenhouse can be used in virtually all climates
for all crops since they can be designed to protect crops
from extreme levels of snow, rain, wind, hail, heat and insects
while still allowing crops to benefit from the natural outdoor
environment when conditions permit. The range of environmental
control possibilities goes far beyond the retractable roof.
Complete flexibility can be achieved through the addition
of roll up sidewalls and retractable curtains that can be
used for: |
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Light and temperature control |
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Photoperiod control |
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Insect exclusion |
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Additional heat retention |
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 The
A-Frame greenhouse with roll up walls |
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| The retractable roof
can automatically be fully closed, fully retracted or partially
closed to create the best possible environment for the crop
based on the outside weather conditions. |
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a computer controls the roof, crops can be automatically: |
| 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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| Expanding
the range of environmental control using additional stationary
or retractable curtains |
| Clear woven poly |
White woven poly |
Blackout- heat retention |
Insect net |
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| Maximum
flexibility and control |
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| Maximum flexibility is possible by
incorporating two retractable curtain systems inside the A-Frame
greenhouse, one for insect screening and the other for cooling
and heat retention. Each roof and curtain system is independantly
powered and roll up curtains create removable partition walls
to allow each house to create a different growing environmnent. |
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| Specifications |
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| Retractable
Roof System Features |
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One motor controls up to 38,000 sq.
ft. (3500 sq.m) |
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Designs available to handle snow loads
of up to 70 lbs./sq. ft. (32 kilo./sq.m.) |
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Designs available to withstand up
to 120 mph winds (193 kph) |
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Roof opens and closes in approximately
2 ½ minutes |
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| Direct drive
system mounted along the gable end. One motor can power
up to 5 houses and 50,000 sq ft. Roofs travel approximately
120cm (4 feet) per minute. Motors can be manually operated
using an allan key in the event of a power failure. |
Heavy-duty universal
joints transition the drive at the peak and gutter. |
Rain drains into the
gutter through drainage slits. |
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| Pulleys are
metal with a pre-greased/sealed ball bearing. |
Drive system mounted
along intermediate truss |
Polycarbonate seal at
drive system mounted along intermediate truss |
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| RC02
Roof Covering |
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| RC02 is a new roof covering that has
been field tested for seven years, has higher light transmission,
and greater fatigue resistance. |
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| Features |
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High light transmission (Approximately
80%) |
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UV stabilized woven and coated polyethylene |
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Blocks approximately 90% of UV radiation and absorbs
approximately 60% of long wave radiation |
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More pliable |
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ASTM E84 results: Flame-spread 20,
Smoke development 45 |
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High tear and impact resistance |
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Usable life is typically 7 to 10 years
on retractable A-Frame roofs |
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Includes limited 4 year pro-rated
warrantee.* |
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For retail applications, fire retardant
roof coverings are available |
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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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| A-frame roofs
are made using RC02 which is woven and coated polyethylene. |
Roofs are suspended using
specially designed hooks, which snap onto the stainless
steel wires. Hooks have a breaking strength of approximately
50 kg (110 lbs). |
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| A-frame roofs
have been designed for up to 70lbs. sq ft snow loads.
Standing on the roof is not recommended |
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| Structure
Features |
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Standard house widths 24' (7.3m),
30' (9.14m) , 31'-6" (9.6m) , 36' (10.98m), 41'-6"
12.65m) , 42' (12.8m) |
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Gutter heights up to 20ft (6m) |
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Designed to handle snow loads of
up to 70 lbs./sq. ft. (342 kilo./sq.m.) |
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Designed to withstand up to 120 mph
winds (193 kph) |
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Designed to meet required crop loads |
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Fire retardant roof coverings are
available for retail applications |
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| Overview of A-frame
system |
Truss is supported above the
gutter to allow the rain to drain into the gutter. |
Roof fully closed |
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| Roofs are moved
using stainless steel cable. |
Double flap on the moving edge
seals into the flange on the top chord of the truss. |
Roof shown fully closed to
create a water tight seal |
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| Top view showing
the roof closed |
Insulated exhaust
stacks from heaters at intermediate truss |
Stainless steel wires are tensioned
uniformly using a tightening tool with a built in torque wrench.
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| Polycarbonate roof
covering can be used to cover potting area or dry goods area |
Wider driveways can be created
using energy trusses. |
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Products
