Abstract
As climate change in the Nordic region brings an increase in extreme precipitation events, blue-green roofs have emerged as a solution for stormwater management, hereafter referred to as “blue-green roofs”. The addition of blue-green layers on a conventional compact roof represents several multi-disciplinary technical challenges and quality risks that must be managed. This paper aims to list and address the key building technical challenges associated with blue-green roofs and to present a framework for managing these risks. Literature and document studies as well as qualitative interviews and expert meetings have been conducted to collect research data on defects in blue-green roofs and causes thereof. A list of nine key challenges has been extracted along with recommendations on how to address them. The recommendations are structured around a framework developed for practical use in building projects. For ease of use, the nine key challenges are presented on a general level, with references to detailed recommendations. The framework is intended to be used to reduce the building technical risks of blue-green roofs, by addressing the most important quality risk elements.
Highlights
Areas with high traffic may take damage over time, this is mainly confined to the10upofpe2r4 layers of the blue-green roof, i.e., the plants themselves
The research shows that technical risks associated with blue-green roofs are numerous, but overall manageable
The most notable risk is that of water intrusion into the roof structure, which may happen as a result of several different defects, and is challenging to identify and repair
Summary
In the Nordic countries, the most notable impacts of climate change include an increase in temperature, increased precipitation, and an increase in the intensity and frequency of intense rain events [2]. Such events bring a high risk of urban flooding, with the stormwater drainage systems becoming overloaded due to insufficient capacity, and generally being in poor condition [3]. As stormwater is prevented from infiltrating into the ground locally, there is a need for alternative detention and retention capacity such as green roofs, rain gardens, and bioretention planters to prevent urban flooding [5,6]
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