giant greenhouse to grow vegetables on the roof of a building in Montreal | Food Production and Preservation | Forums

Well that's a pretty brilliant use of dead commercial space, you would have to think that saves on heating and cooling as well for the building.

Located in Montreal (Quebec, Canada), Lufa Farms is reputed to have built the world’s first commercial greenhouse on the roof of a building. They grow food where people live and grow it more sustainably.

At Lufa Farms, energy is optimized. Although the greenhouse is heated during the winter nights, it enjoys the warmth of the building below and the sun through the windows. Furthermore, thermal curtains are used to maintain the heat overnight. As the products is being sold directly to consumers through picking points, no need to refrigerate food.

http://pktur.com/emdddddg/