Green roofs as an alternative to sustainable buildings
DOI:
https://doi.org/10.18378/rvads.v13i5.6197Keywords:
Sustainable Roof, Cost variation, Thermal comfort, Sustainable buildings.Abstract
The green roof has been considered as an alternative to mitigate some environmental problems present in urban centers, such as floods, air pollution and noise, and islands of heat. Besides, it can act as thermal insulation in buildings providing thermal comfort and energy saving. However, one of the downsides is its high cost of implementation. This work presents experimental research carried out in Limeira, São Paulo, with the objective of evaluating two aspects of green roofs: its cost of implantation and its performance as thermal insulation in the study region. For the composition of prices, the widely used green roof construction systems were considered, estimated by square meter in specialized companies and as unitary materials in local commerce, presenting value variations of up to 835%. For the thermal performance analysis, three experimental modules (M) were built. The M1 has only a waterproofed concrete slab (control roof), and the other two have extensive green roof systems: M2 using Chlorophytum comosum, and M3 with Hemigrafis alternata. The control of the indoor and outdoor temperature and humidity in the modules was carried out with thermohygrometers (Testo 174 h data logger) in measurements every 10 minutes for 40 days. With this analysis, we verified that the vegetated coverings (M2 and M3) presented the best thermal performance with the maximum temperatures up to 3.4 ° C lower than those of M1 (control). We concluded that, although the implantation cost is still high, the green roof is feasible, because it has environmental benefits and thermal comfort and can lead to a decrease in the consumption of electric energy.Downloads
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