Toronto City Council has mandated that as of January 2010, all new construction must have a certain percentage of the roof designated as a GREEN Roof. While the idea sounds great at the onset, I am pessimistic...as usual:
Developers are often short sighted. They know that they have a finite time to build and sell the property, making their profit as quickly as possible. Some are often known to take shortcuts and seldom see themselves involved in the property twenty years from completion. Most intend to be completely finished with the property within five years. (I often have to console Buyers who are looking for attention from their Builders and tell them that when buying new, " By the time you get to closing, you have to realize that most Builders are working on the third or forth project down the line").
That being the case, what happens when those GREEN Oasis' have to be attended to 20 years from now? Roofs are exposed to the elements and need constant maintenance at the best of times; add in to the mix that there will be roots and added weight of growing materials.
GREEN Roofs are a great dream but I pity the Condominium Corporation and their Board of Directors 20 years from now when they have to re-roof and replace what was originally built. Are GREEN Roofs a short term dream(20 years) or a nightmare?
Bob Aaron wrote an article on the same topic. Check it out!