There is increasing interest in the garden roof system as a sustainable building design option in North America today. This Update reports the results of a field study to evaluate the thermal performance of this technology, as well as its potential to retain storm water runoff.
Garden roofs, sometimes known as green roofs or rooftop gardens, are specialized roof systems that support vegetation growth. With technical advances in roofing materials and components, garden roof systems can now be successfully installed in most climates, providing an attractive design option, especially in urban areas where land available for parks and green space is limited. As well, concern about sustainability and climate change have led to increased interest in garden roofs as a possible means of helping address these issues. However, while garden roofs are increasing in popularity, there is little information on their performance in cold climates.
Figure 1. Conventional roofing system (a) with and (b) without a garden roof system.
Figure 2. Protected membrane roofing system (a) with and (b) without a garden roof system.
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