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Agricultural Greenhouses: Methodology and Construction

11.02.2014
Regis Eder Neu

Stage 12 – Covering the greenhouse with plastic film

Covering the greenhouse with the plastic film requires at least ten people to roll the plastic film over the greenhouse to ensure a tight fit, plus nailing it to the upper and lower sides of the greenhouse, next to the foundations. Start by stretching the plastic film from the sides (Photo 153), folding the plastic (Photo 154) and stapling into the upper gusset (Photo 155, 156 and 157). Then, lift the plastic-wrapped lumber to the upper side of the greenhouse (Photo 158) and align it with the roof structure’s upper side beam/board (Photo 159). After that, nail it from side to side (Photos 160 and 161) with 40 cm spacing (as viewed from inside in Photo 162). The same procedure is repeated on the other side, folding the plastic film and nailing it to the gusset (Photos 163, 164, 165 and 166), pulling the film to the upper side board (Photos 167), where the piece of lumber will be nailed (Photo 168). Observe the position of the curtain’s batten/piece of lumber (Photo 169), so that the upper roof plastic will fit in it. Installing the side curtains should be executed from the top of the wooden roof structure (Photos 171 and 172).

To more easily cover the greenhouse with the plastic film (Photos 173, 174 and 175), unroll the plastic over the wooden roof structure. After stretching the plastic, roll the ends around a batten/piece of lumber the full width of the greenhouse. The plastic film should be rolled around the batten from the inside out to insulate it from rain water (Photo 176). Next, nail the plastic-wrapped battens to the upper sides of the greenhouse (Photos 177, 178 and 179). Make sure the plastic film is firmly stretched to keep the wind from tearing it. Pull the plastic-wrapped batten/piece of lumber and fit it under the previously nailed side curtain batten (Photo 180).

Once the plastic cover is firmly stretched and the batten/piece of lumber is in place (Photo 181), we can start nailing the cover’s batten (Photo 182) on the side curtain’s batten (Photo 183), thus keeping rain water from leaking into the greenhouse. Photos 184–189 show how to roll the plastic around the battens, which are to be pulled down, fitted and nailed to the upper part of the wooden roof structure of the greenhouse. The firmly stretched side curtains (Photos 190 and 191) will provide greater safety for the greenhouse. Now the cover of the agricultural greenhouse with alternative materials (Photos 190, 191, 192, 193 and 194) is ready, its plastic film roof cover firmly applied, nailed, and made safe against wind action.

Photo 153 Pulling greenhouse side plastic film tight with 5 cm batten and stapling it
Photo 154 Fold plastic film once before stapling it
Photo 155 Staple plastic film onto side piece of lumber
Photo 156 Fold and stretch plastic before stapling it on lumber/batten
Photo 157 Staple folded plastic film along the entire length of the greenhouse
Photo 158 Raise film-wrapped batten standing on scaffold
Photo 159 Position the plastic-wrapped lumber/batten at the same height of greenhouse side board
Photo 160 Nail side curtain
Photo 161 Nail the whole right side curtain
Photo 162 Inside view of right side curtain
Photo 163 Fold plastic film once before stapling it
Photo 164 Stretch the plastic film over greenhouse lateral piece of lumber/batten
Photo 165 Stretch the plastic film over greenhouse lateral piece of lumber/batten
Photo 166 Staple plastic film onto side piece of lumber
Photo 167 Fitting side curtain into greenhouse upper side structure
Photo 168 Nail side curtain onto greenhouse upper side structure
Photo 169 Position of side curtain in relation to greenhouse upper structure
Photo 170 View of correct position of greenhouse side curtain
Photo 171 View from inside of greenhouse left side curtain
Photo 172 View of side curtains nailed onto upper part
Photo 173 Pulling out the plastic film over the greenhouse
Photo 174 How to pull the plastic over the greenhouse
Photo 175 Rolling out the plastic film cover over the greenhouse
Photo 176 Roll and nail plastic film onto side batten; then nail it below side curtain batten
Photo 177 Making greenhouse rooftop plastic film same size as piece of lumber
Photo 178 Wrap cover plastic around piece of lumber/batten and pull it tight
Photo 179 Pull the film, roll it, and stretch it
Photo 180 Roll plastic film around piece of lumber and pull it until it fits under the upper side curtain batten
Photo 181 Fit the film-covered batten into the wooden roof structure
Photo 182 Nail the batten after pulling and fitting it into greenhouse upper side structure
Photo 183 Nail stretched plastic film onto the greenhouse upper wooden roof structure
Photo 184 Roll up the extremity of the greenhouse plastic film and nail it onto wooden roof upper structure
Photo 185 Roll up the extremity of the greenhouse plastic film and nail it onto wooden roof upper structure
Photo 186 Roll and stretch the plastic film at the end of the greenhouse
Photo 187 Roll the extremity of the greenhouse side film curtain around the batten and pull plastic film
Photo 188 Roll the extremity of the greenhouse side film curtain around the batten and stretch the plastic film
Photo 189 Nail the stretched side curtain onto the greenhouse lower structure
Photo 190 View of side curtains and cover nailed onto the greenhouse
Photo 191 View of side curtains and cover nailed onto the greenhouse
Photo 192 View of the agricultural greenhouse with alternative materials
Photo 193 View of the agricultural greenhouse with alternative materials
Photo 194 View of the agricultural greenhouse with alternative materials
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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.