Be the First on Your Block to Have a Green Roof
A “green” or “living” roof is nothing new, really; Europe has been a big fan for some time now. However, the US is just starting to catch on to the idea, and again it floors me that something that is this good of an idea didn’t catch on years ago. Kinda like solar panels on the White House…
The idea is simple. Instead of traditional roofing materials, layers of materials including “soil” (it’s really more of an aggregate like in hydroponic growing methods) are installed complete with plantlife. Instead of a hard surface, rainwater falls onto the soils and the plants. The natural roof filters water naturally and slowly, rather than just rush the water off through the storm drains into the sewer system. Some green roofs go all out and actually use the space to grow crops or create a natural habitat for wildlife.
The Fairmount Waterfront Hotel in Vancouver, BC, Canada has a roof-top garden that produces about $30,000 worth of produce and herbs yearly.
The “green roof” trend is growing outside of Europe. Japan requires that 20% of all new roofs on larger buildings be “planted.” The self-proclaimed “greenest city in America”, Chicago, Illinois is encouraging green roofs on new buildings and on retrofitted roofs with tax credits.
Fors's Rouge River Plant is covered with sedum.
There are some downsides in green roofs, mostly by way of costs and the feasibility of retrofitting older buildings that were not designed to carry the extra weight of the plant-roofs. But costs can be mitigated by way of the savings that green roofs bring in terms of cooling costs. Hard-surface roofs can get mighty hot in the summer, and that heat is transferred inside to an extent. A green roof will stay around the ambient temperature, even in the middle of August.
Those cooling tendencies of green roofs also help out the area around the building, and by extension, if all roofs were green or partially green at least, the surrounding community will benefit. That is why Tokyo is pushing green roofs so hard. Tokyo’s average temperature has outpaced global warming increases by 5.
green roofs, natural roofs, eco-roofs, plant roofs, planted roofs, roof construction, sustainable roofs, green building, sustainable building, US, Tokyo, Europe, Chicago, Illinois, heating, cooling, costs, global warming, temperature
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