COURTESY OF ENVIRO-STEWARDS — Designing a blue roof on a large building allows for water retention, captured for use inside a building, or a delayed release to mitigate the impact on flooding through controllable drains.
“It is a standard that describes building in resilience to climate change. It is not in the building code yet, but it has been around for a couple of years,” said Sheridan. The 5,000-square-foot roof captures water and when it reaches a depth of two inches, controllable drains direct it to storage tanks for flushing toilets or watering a green wall. Water can also remain on the rooftop to evaporate and add to summer cooling or can be slowly released into the municipal storm sewers at a time when it won’t contribute to flooding.
“It is a new trend, not so much here, but it is happening all over Europe,” he said, as the cooling ability of green roofs can increase panel efficiency by five to 15 per cent compared to placing them on a hot roof. In northern Saskatchewan areas in institutional buildings such as schools, he said, there is a move toward sloped metal roofs that will help against large fire threats.
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