Roofs with gardens and greenery on top could become a lot more common in Vancouver if a motion is successfully passed at city hall Tuesday — but developers are concerned that they weren’t consulted first.
Coun. Adriane Carr wants to make having a green roof mandatory for new large buildings, including commercial, industrial, institutional and multi-family residential developments. Single-family homes wouldn’t be impacted.
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Carr said there are a host of reasons behind the motion, the most immediate being coping with excess rainfall in the city.
“People probably around the city have seen the bubbling up of the water from our storm sewer, drains that come out and flood their streets. We have an excess of water and we need to deal with it and green roofs are a great way to do it,” she said.
A study from BCIT’s centre for architectural ecology found that a green roof reduced rainfall runoff by 28 per cent when averaged between the wet and dry seasons.