Abstract Green roofs are increasingly being used to improve the energy balance and stormwater management of buildings. This work examines the thermal behaviour, water drainage and vegetation growth of two green roof systems: a conventional system containing extruded polystyrene and polyethylene, and an alternative cork-based system. In the new system, an eco-friendly expanded cork layer is used to provide thermal resistance and water storage capacity in a more sustainable way, as cork is a natural material. This material can also be used as an uncoated finishing layer for architectural purposes. The main goal of this work was to see if the new system is reliable in real environmental conditions and to compare its behaviour to that of the conventional system for a full year. This work presents the results of a fully functioning prototype built in Portugal with a technical substrate 10 cm thick and planted with a variety of vegetation. The reference and proposed systems were installed side by side and monitored under spring, summer, autumn and winter conditions. The thermal insulation and the water drainage and storage capacity provided by the cork-based green roof were found to be similar to those of the reference solution, with the expanded cork layer showing a more marked temperature delay and a more effective management of rainfall events under dry conditions. Additionally, it was found that the growth and health of plants in the cork-based green roof were comparable to those of the reference solution, indicating the good performance of the cork system.

中文翻译：

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基于软木的屋顶绿化解决方案与传统屋顶绿化解决方案的比较

摘要 屋顶绿化越来越多地用于改善建筑物的能量平衡和雨水管理。这项工作检查了两个绿色屋顶系统的热行为、排水和植被生长：一个包含挤出聚苯乙烯和聚乙烯的传统系统，以及一个基于软木的替代系统。在新系统中，由于软木是一种天然材料，因此使用环保的膨胀软木层以更可持续的方式提供耐热性和储水能力。这种材料也可用作建筑用途的未涂层饰面。这项工作的主要目标是查看新系统在实际环境条件下是否可靠，并将其行为与传统系统的行为进行一整年的比较。这项工作展示了在葡萄牙建造的功能齐全的原型的结果，该原型具有 10 厘米厚的技术基板，并种植了各种植被。参考系统和建议系统并排安装，并在春季、夏季、秋季和冬季条件下进行监测。发现基于软木的绿色屋顶提供的隔热和排水和储存能力与参考解决方案相似，膨胀的软木层显示出更明显的温度延迟和更有效的降雨事件管理干燥条件。此外，还发现基于软木的绿色屋顶中植物的生长和健康状况与参考溶液的植物生长和健康状况相当，表明软木系统的良好性能。