W aterloo City Hall is a highlight of the city’s green roof initiative, which has encouraged many public and private buildings in the city to use green roofs as a way to increase the amount of green space in the city, improve energy efficiency for the building, and extend the life of the roof. The 16,800 square foot roof of Waterloo’s City Hall was installed September 2005, around the existing rooftop air handling units (AHUs). In 2011

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