August 2024 - 39

SGAFT
When Keith and I were designing
this greenhouse my wish list
included twin wall polycarbonate
glazing on the roof and ends.
The side walls roll up for natural
ventilation in conjunction with a
ridge vent so polycarbonate wasn't
an option there. As the project's
quote took shape, compromises
were needed to stay on budget. The
biggest compromise was saving
money on the roof with economical,
inflated double poly.
Polycarbonate on the end walls
wasn't a budget buster and reasons
for wanting it included a cleaner
look, framing needs (poly requires
more to minimize flapping) and
better heat retention.
The decision was made four
years before these calculations. Back
then, something told me to invest in
the end walls, and Table 2 supports
the decision. My end walls are twice
as important as yours regarding
exposed surface area and heat loss.
In hindsight, I'm glad I spent money
on them, it was just a gut feeling that
turned into a wise choice.
Table 2 shows differences in sides
and roof area contributions for both
DIMENSIONS
24 x 40
24 x 100
40 versus 100
SIDE WALL
(FT)
6
6
FOOTPRINT
(SQ. FT.)
960
2400
SURFACE AREA
(SQ. FT.)
2110
4560
SURFACE
AREA/
FOOTPRINT
2.2
1.9
+16%
Table 1. Greenhouse dimensions, surface area and surface area to footprint ratio.
Data courtesy of Konjoian's Horticulture Education Services (KHES).
DIMENSIONS
24 x 40
24 x 100
Difference
SURFACE
AREA/
FOOTPRINT
2.2
1.8
+16%
ENDS (%) SIDES (%) ROOF (%)
23
11
2.1x
23
26
0.9x
54
63
0.9x
Table 2. Greenhouse surface area distribution. Data courtesy of KHES.
houses not as large as the end walls.
Both show our two houses almost
identical in terms of the contribution
of the sides and roof to total surface
area. The big difference is the end
walls; the smaller the house, the more
important are its end walls.
The last column in Table 2 presents
the percent of each greenhouse's
perimeter occupied by the side walls.
Discussion of this column and how I'm
managing my side walls seasonally
continues online, along with additional
greenhouse surface area to size
comparisons.
Konjoian's Horticulture Education
Services created SGAFT to serve the
unique needs of small greenhouse and farm
operations. Peter Konjoian's unapologetic
mission for the project is to help fellow
small growers integrate complementary
technologies, appropriate at their
operational scale, to maximize profitability.
SIDES VS.
PERIMETER
(%)
63
81
GREENHOUSE PRODUCT NEWS 39

http://sbigrower.com

August 2024

Table of Contents for the Digital Edition of August 2024

Table of Contents
Editor's Report | Are you controlling?
Production | Savvy sanitation protocols
Variety Information | A need for natives
Editors' Picks | Green goods: Editors' picks from Cultivate'24
CEA | LED lighting
Great Lakes EXPO | Gearing up for EXPO 2024
Forty Under 40 Perspectives | Inventory management in the nursery
Culture Report | Roselilies
Technically Speaking | Extended photosynthetically active radiation
SGAFT | Geometry: Small greenhouse surface area distribution
AmericanHort | Plug & Cutting: Focused on young plants
Product Marketplace
Industry News
Events
Classifieds/Ad Index
August 2024 - Table of Contents
August 2024 - 2
August 2024 - 3
August 2024 - Editor's Report | Are you controlling?
August 2024 - 5
August 2024 - Production | Savvy sanitation protocols
August 2024 - 7
August 2024 - 8
August 2024 - 9
August 2024 - 10
August 2024 - 11
August 2024 - Variety Information | A need for natives
August 2024 - 13
August 2024 - Editors' Picks | Green goods: Editors' picks from Cultivate'24
August 2024 - 15
August 2024 - CEA | LED lighting
August 2024 - 17
August 2024 - 18
August 2024 - 19
August 2024 - 20
August 2024 - 21
August 2024 - 22
August 2024 - 23
August 2024 - Great Lakes EXPO | Gearing up for EXPO 2024
August 2024 - 25
August 2024 - Forty Under 40 Perspectives | Inventory management in the nursery
August 2024 - 27
August 2024 - Culture Report | Roselilies
August 2024 - 29
August 2024 - 30
August 2024 - 31
August 2024 - Technically Speaking | Extended photosynthetically active radiation
August 2024 - 33
August 2024 - 34
August 2024 - 35
August 2024 - SGAFT | Geometry: Small greenhouse surface area distribution
August 2024 - 37
August 2024 - 38
August 2024 - 39
August 2024 - AmericanHort | Plug & Cutting: Focused on young plants
August 2024 - 41
August 2024 - Product Marketplace
August 2024 - 43
August 2024 - 44
August 2024 - 45
August 2024 - Industry News
August 2024 - 47
August 2024 - Events
August 2024 - 49
August 2024 - Classifieds/Ad Index
August 2024 - 51
August 2024 - 52
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