Going -- and saving -- 'green' Rec center roof still green, even during drought
The green roof at the Dublin Community Recreation Center has been flourishing for more than a year and a half.
Installed in November 2010 to reduce the amount of storm water runoff, reduce energy consumption and educate, the green roof has done just that, city officials said.
"We know (green roofs) result in energy savings," said Michelle Crandall, director of administrative services.
"We did some temperature measurements of the roof before we put in the green roof and after and we know it was drastically lowered ... it's pretty astounding."
The 2,300-square-foot green roof replaced part of the black membrane roof at the recreation center, which gets pretty hot in the summer, Crandall said.
The green roof has also helped reduce the amount of storm water runoff from the recreation center into the nearby South Indian Run Stream.
The 2010 installation was funded partially by a $50,650 grant from the Ohio EPA's Surface Water Improvement Fund.
Dublin paid $22,230 toward the project to divert storm water runoff from local streams and make the water that hits the streams better.
The sedum planted on the roof can take pollutants out of the water, although Dublin has no way of measuring how much.
"There was one green roof in Kentucky we took a tour of," Crandall said.
"It has a tube that measured storm water runoff and runoff from the plants. They looked at pollutants in each one. It was amazing what they did. We really wanted to do that, but the costs were too much."
Costs aren't high, however, for maintenance for the green roof.
"Sedum is a very draught resistant plant," Crandall said.
"We selected a plant variety we wouldn't have to water. That would defeat the purpose. It is a variety of sedum that were planted that do really well through all the seasons."
During this summer's draught, the plants have needed some watering, said Dublin landscape architect Laura Ball.
City works have used all water collected in two rain barrels on the roof to water the sedum.
Other maintenance on the plants must be done once a year, Ball said.
"We've done our once-a-year scheduled mowing and fertilizer application," she said. "It's thriving and doing fine."
Cutting the sedum ensures variety so none of the plants get choked out by others. Weeding is also necessary for the same reason.
"The variety is a green roof safety net," Ball said.
"They all have a climate they do better in."
People have viewed the sedum since installation, which was another aim for the green roof.
"We did it as a demonstration site," Crandall said.
The city schedules tours and does them by request.
"When we did the 'Growing Green in Dublin' event we had (the roof) open," Crandall said. "If people call we will set up a time to tour.
"Soon after we put it in we did a tour for landscaping and construction companies," she said.
"These groups are looking at what they can duplicate."