The 10.3-acre reroofing of Chicago’s Jardine Water Filtration Plant replaced a 50-year-old tar pitch roof with gravel ballast and 712,000 board-feet of two-inch cellular glass insulation atop 30,000 ...

An aerial view of most urban areas shows swathes of asphalt, black tar and gravel-ballasted rooftops. Heat radiates off of the dark roofs and water rushes over the hard, hopefully impermeable ...

Q: When you were writing about roof repair and replacement, I never saw anything on tar-and-gravel roofs. I just bought a house. At my prepurchase inspection, I was told the roof was in pretty ...

It also suits gravel and green roofs, the company said in a statement. The ballasted system has four fixing points on the long side, with an option for six to reinforce perimeters.

“The base can be filled with water, gravel, or sand,” Landatu CEO Cristian Martín told pv magazine. The system has 56 liters of capacity and can reach a weight of up to 100 kg when filled ...