ABSTRACT: The building roofs are elements that get the heat from the solar radiation. The green roof can be an alternative to minimise the heat effect, in addition to providing other benefits. The vegetation of the roof, as any others, needs care and water to grow. An alternative solution could be the roof storage and retention of rainwater, with aim to reduce the cost of irrigation became it sustainable. The objective of this study is evaluating the green roof storage of rainwater system using reusable materials. The experiment realised on the building roof at Pelotas University – Capão do Leão Brazil- in the summer. The green roofs have in common the layers components: waterproofing, drainage, topsoil and grass, differing by with and without storage and retention water system. Two covers were implemented: the first, with four cells, one without storage water system, as a reference (1), and the others three with storage and retention water system consisting, respectively, PET bottle (2), eggs plastic packaging (3) and sowing plate, as a material alternative trade (4). Due to the straightening best presented by the cell (2), in the second coverage they were only used pet bottle, with different heights. The vegetation of the covers kept stable, while drying a little bit in dry periods. The green roof monitoring shows that the system areas with more storage water volume, has better results in qualitative and visual analysis, indicating that the green roof implementation with rainwater storage devices could be a sustainable and lasting solution.
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