text: The city of Toronto approved a by-law in May 2009 mandating green roofs on residential and industrial buildings.  There is criticism from Green Roofs for Healthy Cities that the new laws are not stringent enough, since they will only apply to residential building that are a minimum of six stories high. By 31 January 2011, industrial buildings were required to render 10% or  of their roofs green. Toronto City Hall's Podium roof was renovated to include a  rooftop garden, the largest publicly accessible roof in the city.  The green roof was opened to the public in June 2010. Many green roofs in Canada also use sustainable rainwater harvesting practices.
  In 2008, the Vancouver Convention Centre installed a  living roof of indigenous plants and grasses on its West building, making it the largest green roof in Canada.
  The new Canadian War Museum in Ottawa, opened in 2005, also features a grass-covered roof.
  During the renovation of the Hamilton City Hall in Hamilton, Ontario that spanned from 2007 to 2010, many efforts were taken to enhance the environmentally friendly nature of the structure, which included the addition of a grass-covered roof.
  Simon Fraser University's Burnaby campus contains a substantial number of green roofs.
  Canadas first LEED Platinum V4 Home in Wakefield QC, EcoHomes Edelweiss House, has a living Green Roof which is sloped at 12 degrees.