November 2020 - 33

STRUCTURES & EQUIPMENT
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The R-value for 3 mm glass is
0.95, which is just slightly higher
than poly film. This would make
glass cladding better for warmer
areas due to its lack of insulation.
If someone chooses glass cladding
and lives in a colder climate, their
heating costs will be considerably
raised for their greenhouse during
the winter months, and they should
budget for an energy-efficient
heating system.
TWIN WALL POLYCARBONATE
Many growers think they want glass,
but they really need polycarbonate.
Twin wall polycarbonate is the
second most expensive option but
lasts for years, is incredibly durable
and more than makes up for the
increased cost. It is usually best
for commercial and professional
uses, but twin wall polycarbonate
can be used by anyone, from
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It provides ultimate durability,
and is great for harsh climates
and inclement weather. What
would puncture poly film, for
example, will not affect twin
wall polycarbonate due to its
rigidity. It is impact-resistant
and sometimes even referred
to as " bomb-proof, " so it will
withstand just about anything
thrown its way, making it a
superior option to glass.
The light transmission of twin
wall polycarbonate is 80%.
Although this is comparatively
low, this material offers enhanced
light diffusion and UV protection,
ensuring crops will always be
protected from UV rays and
constantly receive an even,
softened natural light.
What twin wall polycarbonate
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lacks in light transmission, it
makes up for in insulation. This
material's R-value is 1.72, which
makes twin wall polycarbonate
the most insulated cladding
option. This material has two
layers, so air provides added
insulation. But unlike double poly
film, twin wall polycarbonate
does not require a fan, as the
air is already present between
the layers of the cladding. This
means it is better at retaining
heat, which is especially
beneficial for growers in colder
climates, and it will save growers
money on heating their structure
during winter months.
Every grower should consider
these factors when choosing
their greenhouse cladding. It is
important for growers to pick the
best cladding for their operation
by considering their crops'
needs. Think about the climate
the greenhouse is in, as well as
how durable the cladding needs
to be and what is affordable. The
correct purchase will ensure that
their crops will flourish, so they
should always do research and
make their decision carefully.
FEEL SECURE KNOWING THAT WE HAVE YOUR BACK.
Janine Coppola is a copywriter with
GrowSpan Greenhouse Structures. To
learn more about GrowSpan and its
products, go to www.growspan.com.
Vested in Your Success
GREENHOUSE PRODUCT NEWS 33
http://www.growspan.com
November 2020

Table of Contents for the Digital Edition of November 2020
