The National Mall in Washington, District of Columbia — The American Northeast (Mid-Atlantic)
Green Roof Engineering
Once the stone façade and roof are restored, the U.S. Botanic Garden (USBG) will install a new green roof on top of the stone part of the Conservatory. This plant-covered roof will reduce the amount of heat absorbed by the building and decrease the building's contribution to the higher average temperatures of D.C. compared to surrounding rural areas (this phenomenon is known as urban heat island effect). The green roof will also absorb rainwater, reducing runoff.
Green roof systems are constantly evolving as designers seek to balance efficient drainage with adequate water retention, while protecting a roof's waterproofing and minimizing its overall weight. Because they are heavier than traditional roofs, a green roof's design is limited by the existing building's structural design. The USBG's green roof will be less than 27 pounds per square foot.
As you can see here, the new green roof has been engineered to support a diversity of plants while insulating the building and keeping the roof watertight. Once it is installed, USBG gardeners will maintain this vibrant rooftop garden.
Erected by United States Botanic Garden.
Location. 38° 53.307′ N, 77° 0.78′ W. Marker is in The National Touch for map. Marker is at or near this postal address: 100 Maryland Avenue SW, Washington DC 20002, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Green Roof Plants (here, next to this marker); Power from the Wind (a few steps from this marker); a different marker also named Power from the Wind (within shouting distance of this marker); The Pollinator Partnership (within shouting distance of this marker); United States Botanic Garden (within shouting distance of this marker); The National Garden Takes Root (within shouting distance of this marker); James A. Garfield (about 300 feet away, measured in a direct line); The Rose Garden (about 300 feet away). Touch for a list and map of all markers in The National Mall.
Categories. • Architecture • Environment •
Credits. This page was last revised on November 26, 2017. This page originally submitted on November 22, 2017, by Devry Jones of Washington, District of Columbia. This page has been viewed 73 times since then and 14 times this year. Photos: 1, 2. submitted on November 22, 2017, by Devry Jones of Washington, District of Columbia. • Bill Pfingsten was the editor who published this page.