The Gail Borden Public Library is planting a message of sustainability for the Elgin community right on its own rooftop.

The library recently covered parts of its roof with plants officials expect to absorb rainwater, produce oxygen and provide extra insulation for the building.

Denise Raleigh, director of marketing, development and communications, said the library expects some energy savings due to the added layer of insulation, though she cautioned the savings may be small.

“We will be happy with any kind of savings, because we see ourselves as kind of a leader or partner in sustainability here in Elgin,” she said.

The plants are low maintenance and only will need to be watered if there is an extended drought, she said.

The Gail Borden Public Library recently installed a green roof onto parts of its building at 270 N. Grove Ave. The roof covering consists of low-maintenance plants. (Melissa Jenco/Tribune)

Raleigh said the concept of greenery on rooftops dates all the way back to ancient times.

It was part of the original plans for the library when it was built in 2003, but was put on hold to keep construction under budget.

“We know everyone has always been watching the balance sheet throughout the community so we were very conscientious when building this building to make sure we didn’t overspend,” she said.

In April, library board members approved moving forward with the project, which cost $77,000. Raleigh said the bill was paid entirely though donations.

Library patrons can get a close-up view of the greenery from Studio 270 or the Literacy Connection. They also can knock on the administration office door on the second floor and ask for a member of the communications staff to give them a peek.