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Agricultural Greenhouses: Methodology and Construction

11.02.2014
Regis Eder Neu

Stage 8 – Building the greenhouse wooden roof frame

In this stage begins the construction of the wooden frame that will hold the greenhouse roof film glazing (Photo 93). In this stage we measure, mark and cut the lumber (Photos 94, 95, 96, 97 and 98) that will be used to make the greenhouse wooden roof frame.

Mark out the timber with a pencil and a triangle forming a 45-degree angle (Photos 99 and 100). The marks and diagonal cuts (Photos 101, 102, 103 and 104) indicate the structure’s upper joint. The structure of the greenhouse wooden roof structure begins (Photo 105 and 106). Photos 107 and 108 show the marking out of the wooden structure where the upper wooden structure will be laid. After marking and checking for the right width, proceed with cutting the joint (Photo 109), nailing the wood to the structure’s wider base (Photo 110 and 111), after cutting the joint (Photo 112), as well as the diagonal cuts (Photos 113 and 114). View the position of the wooden structure from below the notch (Photo 115), which can now be nailed to the base of the larger structure (Photos 116 and 117). Now we can view the shape of the greenhouse wooden roof structure (Photo 118). Cuts are made to align the nailed board with the main structure (Photos 119 and 120). To facilitate attaching the wooden structure to the columns, holes are drilled in the extremities (Photos 121, 122, 123 and 124).

Observations: Visualize the measures in order to better understand this step (Figure 2, which is below).

Figura 2

Photo 93 Shape of the wooden structure over greenhouse
Photo 94 Length of beam to rest wooden structure (4.94 m)
Photo 95 Marking place to be cut out/notched
Photo 96 Marking place to be cut out/notched with try square and pencil for straight cut
Photo 97 Measure and mark out 16 pieces of lumber (1.25 m long x 10 cm wide)
Photo 98 Cutting lumber after marking it out
Photo 99 Draw 45-degree angle with square and pencil to cut wood diagonally
Photo 100 View of greenhouse wooden roof structure
Photo 101 Marking out for diagonal cuts to provide correct joining
Photo 102 Execute cutting after previously marking lumber
Photo 103 Notch shape after cutting
Photo 104 Positioning the lumber for the roof structure
Photo 105 View of roof structure-building process
Photo 106 View of greenhouse roof structure-building process
Photo 107 Marking where wood is to be cut for joining
Photo 108 Checking the width of the lumber that overlaps and joins with upper structure cut
Photo 109 Cutting out the joints
Photo 110 View of the wood joints
Photo 111 Nail lumber to 4.94 meter long board
Photo 112 Cutting the joints
Photo 113 Cutting the joints
Photo 114 View of cut joints
Photo 115 View of notch to fit structure’s upper beam
Photo 116 Nailing lumber extremities after correctly positioned
Photo 117 Nailing the greenhouse wooden roof structure
Photo 118 View of wooden structure after being joined and nailed
Photo 119 Cut excess wood
Photo 120 Nail lumber to structure’s larger purlin
Photo 121 View after wood was cut
Photo 122 Measuring 5.5 cm from lumber end
Photo 123 Drilling holes at end of lumber
Photo 124 Drilling holes at end of lumber
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About the organisation

CIDADES SEM FOME (CITIES WITHOUT HUNGER) is a non-governmental organization (NGO) which has set up sustainable agrarian projects in urban and rural areas based on organic farming. The aim is to help and teach people to manage their own business and become financially independent. Community Gardens, School Gardens and Agricultural Greenhouses have been developed on unused and neglected public and private areas within social focal points to provide jobs and improve the diets of adults and children. In 2009 the Small Family Farms Project, the organizations fourth project, has been set up in Rio Grande do Sul, to train farmers in multiple cropping as an alternative to monoculture and help them starting new businesses in organic farming.

CITIES WITHOUT HUNGER was founded in 2004 in São Paulo by Hans Dieter Temp, who has a degree in Business Administration, and is a Technician for Agriculture and Environmental Policies. In 2013 Hans Dieter Temp was selected and awarded with the title Social Entrepreneur “Changemaker” by Ashoka. CITIES WITHOUT HUNGER has received numerous national and international awards, such as the Milton Santos Award in 2014, created to honor entities and people who have contributed with the city of São Paulo. In 2012 CITIES WITHOUT HUNGER was selected by Caixa Econômica Federal for its commitment to the realization of the UN-Millennium Goals. The organization was also awarded with the Dubai International Award for Best Practices 2010 (UN-HABITAT).

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Cover Photo: Timour Chafik/studiomonaco. Translation (English & Portuguese): Katarzyna Fayterna.