Fact or Fiction: Green Roofs
Are green roofs easy or hard to maintain? Do they cost a lot? How much energy do they save, anyway? Test your knowledge in this "cool" quiz.
On a hot summer day, the surface of a traditional roof can be as much as 90 degrees Fahrenheit hotter than the surrounding air.
Green roofs, also called "rooftop gardens," can only be installed on perfectly flat rooftops.
It costs more than twice as much to build a "cool" roof than to build a standard roof.
An "intensive" rooftop garden, with deep soil and complex plantings, can absorb more than half of the rain that falls on its surface.
The surface of a green roof can actually be cooler than the surrounding air temperature.
A roof mist cooling system uses high-pressure hoses to spray a steady stream of water across a rooftop.
Once installed, a green roof requires no maintenance.
A ballasted roofing system uses rocks to keep the waterproof surface of the roof in place.
A 10-inch tubular skylight can be installed in an afternoon and illuminate about 100 square feet of living space.
A cool roof can remain 50 to 60 degrees Fahrenheit cooler than a standard roof on a sunny day.
Since green roofs are such a new concept, little is known about their sustainability or longevity.
There is only one type of roofing product that meets Energy Star qualifications for cool roofs.
Metal is not an acceptable cool roofing material because it traps so much heat.
White rooftops are generally the coolest and most reflective, but almost any color roof can be a cool roof.
Rooftop gardens help to reduce greenhouse gas emissions.
Generally speaking, a green roof costs more to install than a cool roof.
Urban Heat Island is the name of a new reality show where contestants test their endurance by performing feats of strength on a hot rooftop.
A green roof can help to reduce both cooling and heating bills.
The rooftop garden on Chicago's City Hall covers 20,300 square feet (nearly an entire city block!) and features more than 20,000 plants.
Over its lifetime, a green roof may actually be less expensive than a conventional roof.