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 ...

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 ...

Mathematical models are extremely limited at modeling ballast, the gravel layer located under railway tracks. Researchers have shown that a large part of the energy introduced by a train passing ...

Landatu Solar has introduced a lightweight, plastic system that can be filled with water, sand, or gravel to function as a solar mounting system on flat surfaces. The units can be stacked on top ...

Hamburg, 13 June 2016 Non-penetrative installation of PV systems on pitched roofs with foil and bitumen roofing places high demands on the frame, especially on commercial buildings with low load ...

The New Milton Sand and Ballast company wants to grab 800,000 tonnes of sand and gravel from Downton Manor Farm, Milford-on-Sea. But it has met with another planning rejection.